Metrobility Gigabit Line Protection and Restoration

Metrobility Gigabit Line Protection and Restoration SW 1000 BASE 2752 RESET PRI MAIN PWR SW 1000 BASE 2752 RESET PRI MAIN PWR Metrobility 2752 SW RESET ONDARY PRIMARY MAIN PWR Installation & User Guide Models: 2752-11-01 / 2752-1S-01 / 2752-SS-01

Metrobility Gigabit Line Protection and Restoration (LPR) Standalone Models 2752-11-01 1G TX RJ-45 to Dual TX RJ-45 2752-1S-01 1G TX RJ-45 to Dual FX SFP 2752-SS-01 1G FX SFP to Dual FX SFP Small Form-Factor Pluggable (SFP) Fiber Optic Transceivers: O211-M5 SFP MM/LC (850 nm, 16 db) 500 m O211-10 SFP SM/LC (1310 nm, 17 db) 10 km O211-25 SFP SM/LC (1310 nm, 25 db) 25 km O211-40 SFP SM/LC (1550 nm, 23.5 db) 40 km O211-70 SFP SM/LC (1550 nm, 28 db) 70 km O211-1A SFP SM/LC (1550 nm, 36 db) 100 km Bidirectional Wavelength DivisionMultiplexing (BWDM) SFP Transceivers: O311-10-31 SFP SM/SC (1310 nm/1490 nm, 18 db) 10 km O311-10-49 SFP SM/SC (1490 nm/1310 nm, 18 db) 10 km Coarse Wavelength DivisionMultiplexing (CWDM) SFP Transceivers: O411-80-31 SFP SM/LC CWDM (1310 nm, 28 db) 80 km O411-80-33 SFP SM/LC CWDM (1330 nm, 28 db) 80 km O411-80-35 SFP SM/LC CWDM (1350 nm, 28 db) 80 km O411-80-37 SFP SM/LC CWDM (1370 nm, 28 db) 80 km O411-80-39 SFP SM/LC CWDM (1390 nm, 28 db) 80 km O411-80-41 SFP SM/LC CWDM (1410 nm, 28 db) 80 km O411-80-43 SFP SM/LC CWDM (1430 nm, 28 db) 80 km O411-80-45 SFP SM/LC CWDM (1450 nm, 28 db) 80 km O411-80-47 SFP SM/LC CWDM (1470 nm, 28 db) 80 km O411-80-49 SFP SM/LC CWDM (1490 nm, 28 db) 80 km O411-80-51 SFP SM/LC CWDM (1510 nm, 28 db) 80 km O411-80-53 SFP SM/LC CWDM (1530 nm, 28 db) 80 km O411-80-55 SFP SM/LC CWDM (1550 nm, 28 db) 80 km O411-80-57 SFP SM/LC CWDM (1570 nm, 28 db) 80 km O411-80-59 SFP SM/LC CWDM (1590 nm, 28 db) 80 km O411-80-61 SFP SM/LC CWDM (1610 nm, 28 db) 80 km This publication is protected by the copyright laws of the United States and other countries, with all rights reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed, or transmitted, in any form, or by any means manual, electric, electronic, electromagnetic, mechanical, chemical, optical or otherwise, without prior explicit written permission of Telco Systems, Inc. 2006 Telco Systems, Inc. All rights reserved. Printed in USA.

Table of Contents Metrobility Gigabit Line Protection and Restoration (LPR) Installation & User Guide Overview... 5 Installation Guide... 6 STEP 1: Unpack the redundant twister... 6 STEP 2: Choose an Appropriate Location... 6 STEP 3: Set the DIP Switches... 7 STEP 4: Install the SFP Optics... 9 STEP 5: Connect to the Network... 10 STEP 6: Apply Power... 12 User Guide... 13 LED Operation... 13 Reset Push Button... 14 Link Loss Carry Forward (LLCF)... 15 Copper Loss Carry Forward (CLCF)... 16 Switched On No Activity Received (SONAR)... 17 Single Strand Fiber Failover Protection... 18 Back-to-Back Application... 20 Topology Solutions... 21 Changing the SFP Transceiver... 22 Technical Specifications... 23 Product Safety, EMC and Compliance Statements... 26 Warranty and Servicing... 27 Metrobility and Metrobility Optical Systems are registered trademarks; the Metrobility Optical Systems logo and redundant twister are trademarks of Metrobility Optical Systems, Inc. All others are trademarks of their respective owners. redundant twister technology is a patent of Metrobility Optical Systems, Inc. (U.S. Patent No. 6,058,479) The information contained in this document is assumed to be correct and current. The manufacturer is not responsible for errors or omissions and reserves the right to change specifications at any time without notice.

Overview The Metrobility Gigabit Line Protection and Restoration (LPR) technology in the redundant twister TM offers the resiliency of data link redundancy to ensure network integrity with no down time. This link duplication provides the nonstop networking capability essential for high priority traffic and mission-critical applications. The GigE redundant twister provides full redundant data paths for Gigabit Ethernet devices, as well as 1000Base copper-to-fiber migration. Each GigE redundant twister contains a MAIN port, a PRIMARY port and a ONDARY port. Redundancy is provided between the PRIMARY and ONDARY ports. The GigE redundant twister actively monitors the primary link and if it fails, automatically activates the secondary link without interruption to network operation. Every GigE redundant twister also features SONAR (Switch On No Activity Received). With SONAR enabled, the unit provides protection against loss of data activity in addition to link integrity. The GigE redundant twister offers the following features: Immediate switchover from the primary to the secondary port if the primary link fails. Full and half duplex support. Dynamic Recovery Mode (DRM) operation to ensure session integrity and increased uptime. Network Select Mode (NSM) operation to redirect and isolate traffic adding extra security. A maximum loss of 1-2 packets (measured with minimum packet size and minimum inter-packet gap) due to failover transition. Can be configured to return automatically to the primary port after the failure condition is resolved. Switch on no activity received (SONAR). Automatic or manually controlled switchover. Link Loss Carry Forward on the 2752-SS-01 and Copper Loss Carry Forward on the 2752-1S-01 for troubleshooting remote network connections. 4 Overview

Full signal retiming, reshaping and re-amplification that allow for maximum segment length. Small form-factor pluggable (SFP) fiber optic transceivers compliant with IEEE 802.3-2002. Bidirectional wavelength division multiplexing (BWDM) and coarse wavelength division multiplexing (CWDM) transceiver options. Compatibility with devices configured for auto-negotiation on the copper ports. Fast failover times (750 ms for the 2752-11-01, and 672 ns for the 2752-1S-01 and 2752-SS-01) for low packet/frame loss. Metrobility GigE redundant twister 5

Installation Guide Follow the simple steps outlined in this section to install and start using your Metrobility GigE redundant twister. 1 Unpack the GigE redundant twister Check that the following components have been included: GigE redundant twister Power Supply Four (4) Rubber Feet Your order has been provided with the safest possible packaging, but shipping damage does occasionally occur. Inspect your order carefully for damage that may have occurred during shipment. If you discover any shipping damage, notify your carrier and follow their instructions for damage and claims. Be sure to save the original shipping carton if return or storage of the unit is necessary. 2 Choose an Appropriate Location The GigE redundant twister is intended for use in either office or industrial environments. The unit must be located within six (6) feet of the AC power source being used and placed as far away as possible from electrical noise generating equipment such as copiers, electrostatic printers and other motorized equipment. If exposed twisted-pair wiring is used nearby, the wiring should be routed as far away as possible from power cords and data cables to minimize interference. The unit may be oriented in any manner which enables the physical connection to the power source and leaves a minimum of six (6) inches of space for proper ventilation. 6 Installation Guide

3 Set the DIP Switches A set of DIP switches is located on the back panel. These switches allow you to select from several modes of operation. Refer to the table on the following pages for the proper setting of the DIP switches. The default settings are shown below. DC INPUT/5VDC O N SONR TX AUTO 1 2 3 4 5 6 RED DIP switches (2752-11-01) O N 1 SONR TX AUTO 2 3 4 5 6 RED SONR TX AUTO LINK CLCF RED O N 1 2 3 4 5 6 ON OFF PWR DC INPUT/5VDC SONR TX AUTO LINK O 1 2 3 5 6 N CLCF RED 4 ON or O 1 2 3 4 5 6 N OFF SONR TX AUTO LINK LLCF RED ON OFF DIP switches (2752-1S-01) DIP switches (2752-SS-01) Metrobility GigE redundant twister 7

DIP switches are marked on the back panel and can be set for the following operations. Switch Name Position Operation SONR * ON SONAR (switch on no activity received) is enabled. To properly activate SONAR, the RED and LINK switches also must be enabled. OFF (default) SONAR is disabled. TX ON Transmits data on both the PRIMARY and ONDARY ports simultaneously. OFF (default) Transmits data on the active port only. AUTO ON Active port automatically reverts back to the PRIMARY port when the primary link is reestablished. OFF (default) Active port will not revert back to the PRIMARY port when primary link is reestablished. The ONDARY port remains active. Use the RESET push button located on the front of the unit to force the active port back to the PRI- MARY port and to clear the SW LED. LINK ** ON Link signals are sent out on both the PRIMARY and (default) ONDARY ports. OFF Link signals are sent out on the active port only. With the LINK switch in this position, data is transmitted out the inactive port regardless of the TX switch setting. IMPORTANT NOTE: With the LINK switch in this position, the device on the other end of the PRIMARY and ONDARY ports must not be in auto-sense mode. LLCF or ON Link Loss Carry Forward or Copper Loss Carry Forward is CLCF * enabled. OFF (default) Link Loss Carry Forward or Copper Loss Carry Forward is disabled. * Refer to Link Switch On No Activity Received (SONAR) in the User Guide section for detailed information. ** Not applicable to the 2752-11-01. 8 Installation Guide

Switch Name Position Operation RED ON Operates in Dynamic Recovery Mode. If the (default) PRIMARY link fails, the ONDARY port becomes active. OFF Operates in Network Select Mode (NSM). Use the RESET push button on the front of the unit to toggle between PRIMARY and ONDARY. In NSM, the AUTO switch sets the initial active port on power up (up is ONDARY and down is PRIMARY). Note that the SW LED remains off in NSM. Refer to the description of the AUTO switch. 4 Install the SFP Optics The 2752-1S-01 requires two small form-factor pluggable (SFP) optics. The 2752-SS-01 requires three SFP optics. Optics are shipped separately. Before installing the SFP module, make sure the bail latch is closed, as shown below. Do NOT open the bail. SFP CLOSED BAIL LCH POSITION SFP DO NOT OPEN BAIL LCH To install the optics, align the SFP module so the transmitter ( ) is to the left of the receiver ( ). For a BWDM module, align it so the visible part of the circuit board, located at the back of the module, is facing down. Slide the module into the empty slot. Push the SFP firmly in place. After the optics are seated securely, remove the protective covering on the connectors. 2752 2752 1000 BASE "redundant twister" 1000 BASE "redundant twister" SW RESET SW RESET PRI MAIN PWR PRI MAIN PWR TX RX BWDM SFP CIRCUIT BOARD THE BOTTOM IMPORTANT: The GigE redundant twister is designed and tested to operate using only SFP optics supplied by Metrobility. Safety, performance, and reliability are guaranteed only when Metrobility optics are used. Installing unspecified parts may damage the product and will void the unit s warranty. * Refer to Link Loss Carry Forward (LLCF) and Copper Loss Carry Forward (CLCF) in the User Guide section for more information. This switch is not applicable to the 2752-11-01. Metrobility GigE redundant twister 9

5 Connect to the Network A total of three connections must be made on the front panel when connecting the GigE redundant twister to the network. The MAIN port provides connectivity to the local networking system. The PRIMARY and ONDARY ports provide protected connectivity to a remote system. Connect to the MAIN port. Connect to the PRIMARY port. Connect to the ONDARY port. SW 1000 BASE 2752 RESET PRI MAIN PWR Twisted-Pair Interface The 2752-11-01 and 2752-1S-01 redundant twister units provide one shielded RJ-45 jack for the MAIN port connection. It supports a maximum segment length of 100 meters over Category 5 shielded twisted-pair (STP) cable. The 2752-11-01 provides two additional RJ-45 jack for the PRIMARY and ONDARY port connections. Both ports support a maximum segment length of 100 meters over Category 5 STP cable. Fiber Optic Interface The 2752-1S-01 and 2752-SS-01 redundant twister units provide two or three fiber optic ports, respectively. Each fiber port provides a set of LC or SC connectors. For maximum flexibility in designing or expanding your network, these fiber ports support any combination of the following SFP transceivers. 10 Installation Guide

The maximum distance and fiber type supported by each SFP optic is as follows: SFP Part # Distance Fiber Type O211-M5... 550 m...multimode O211-10... 10 km...singlemode O211-25... 25 km...singlemode O211-40... 40 km...singlemode O211-70... 70 km...singlemode O211-1A... 100 km...singlemode O311-10-xx... 10 km...singlemode (BWDM) O411-80-xx... 80 km...singlemode (CWDM) IMPORTANT: The distances noted are for reference purposes only. The most important factor to achieve the desired distance is the optical power budget. Metrobility specifications indicate the typical transmit power budget. The actual distance is a function of the fiber type and quality, the number and quality of splices, the type and quality of connectors, the transmission loss, and other physical characteristics. When making fiber optic connections, be sure the transmit (TX) optical conductor on the GigE redundant twister connects to the receive (RX) optical conductor of the connected device, and that the transmit (TX) optical conductor of the device connects to the receive (RX) optical conductor of the redundant twister. For information on replacing the SFP transceiver, refer to Changing the SFP Transceiver. BWDM Interface The bidirectional wavelength division multiplexed (BWDM) transceiver provides a singlemode SC connector. The O311-10-xx supports a maximum segment length of 10 km. BWDM transceivers must always be used in complementary pairs. That is, the O311-10-31 must be connected to the O311-10-49. The O311-10-31 transmits data at a wavelength of 1310 nm and receives at 1490 nm. Correspondingly, the O311-10-49 transmits at 1490 nm and receives at 1310 nm. Metrobility GigE redundant twister 11

6 Apply Power Power is provided to the GigE redundant twister from the universal desktop power supply module. The power module is equipped with an S760 hollow-type plug and a standard IEC 320-type AC power receptacle. IMPORTANT: When making power connections, connect the DC power cord to the DC input jack located on the back panel before making the connection to the outlet. Failure to do this properly can damage the product and void the unit s warranty. The GigE redundant twister does not have a power switch. After connecting the unit to the AC power source, verify that the power (PWR) LED is lit. A steady green light indicates the unit is receiving power. TM DC INPUT/5VDC SONR TX AUTO 1 2 3 4 O 5 6 N RED Upon receiving power, the GigE redundant twister goes into normal operation mode and automatically provides the appropriate signal conversion between the connected network segments. Use the individual link () LEDs on the front panel to verify correct segment connectivity. The LEDs will be lit if the following conditions are met: Power is being applied to the unit. There is an active device connected to the other end of the cable, and it is sending idle link signals. All connections are secure and the cables are undamaged. Both ends of the cable are set to the same auto-negotiation state. To maximize device compatibility, the redundant twister is designed with auto-negotiation enabled on its copper ports and disabled on its fiber ports. If necessary, disable auto-negotiation and set full duplex on the fiber port of the remote device to establish link. 12 Installation Guide

User Guide This section contains more detailed user information regarding the operating features of the GigE redundant twister. LED Operation All LEDs are located on the front panel. These include SW, PWR,, and LEDs. There are separate and LEDs for each of the three ports (MAIN, PRIMARY and ONDARY). The status and indication of each LED is described in the table below. LED Label Color (Status) Indication SW * Green (steady) ONDARY port was the active port at some point. PWR Green (steady) Power ON. Green (steady) ONDARY port is active. (off) PRIMARY port is active. (MAIN) Green (steady) Receive link is present. (MAIN) Green (blinking) Receiving data. (PRIMARY) Green (steady) Receive link is present. (PRIMARY) Green (blinking) Receiving data. (ONDARY) Green (steady) Receive link is present. (ONDARY) Green (blinking) Receiving data. SW 1000 BASE 2752 RESET PRI MAIN PWR * This LED functions in Dynamic Recovery Mode (DRM) only. Metrobility GigE redundant twister 13

Reset Push Button A small RESET push button is located on the front panel of the GigE redundant twister. When used with the unit s SW (switchover) and (secondary) LEDs and the AUTO DIP switch setting, the push button allows you to effectively maintain or troubleshoot a PRIMARY link connection. Due to its small size and recessed placement within the front panel, the RESET button should be pressed with the tip of a pointed object. Pushing and holding the RESET push button has no effect. It is the act of pressing the push button that causes a reset. In the event of a PRIMARY link failure, pressing the RESET push button has the following effects: The active port automatically reverts to PRI- MARY when the PRIMARY link is reestablished. Pressing the RESET switch clears the SW LED. Condition The AUTO switch is UP and the RED switch is UP. The AUTO switch is DOWN and the RED switch is UP. Result The active port does not automatically revert to PRIMARY when the PRIMARY link is reestablished. Pressing the RESET switch clears both the SW and LEDs and forces the PRI- MARY port to be the active port. If the - ONDARY link is disabled, it will revert to PRIMARY if the PRIMARY has a good link. If there is only a ONDARY link, then the SW and LEDs will remain lit and pressing the RESET switch will have no effect. The RED switch is DOWN. The unit operates in Network Select Mode (NSM). The RESET push button toggles the active link between the PRIMARY and OND- ARY ports. Note that the SW LED remains off during NSM operation. 14 User Guide

Link Loss Carry Forward (LLCF) The fiber-to-fiber GigE redundant twister (2752-SS-01) has been designed with LLCF functionality to aid in troubleshooting a remote connection. When LLCF is enabled * and the 2752-SS-01 redundant twister stops receiving link signals on a port, this stops the transmission of link signals on the other port of the unit. For example, if LLCF is enabled and two 2752-SS-01 redundant twister units are connected at the PRIMARY port through a cable with nothing else connected to them, their Link LEDs will not be lit. When a valid link is established by connecting to the MAIN port, a complete connection is accomplished. The diagram below shows a typical network configuration using 2752-SS-01 redundant twister units for remote connectivity: Management Station Switch/Hub w/snmp 2752-SS-01 "redundant twister" 2752-SS-01 "redundant twister" Switch/Hub w/snmp Management Station Fiber Cable LED lit = established link LED unlit = no link If the fiber connection breaks, or the device fails, the 2752-SS-01 redundant twister carries that link loss all the way to the switch/hub which generates a trap to the management station. The administrator can then look at the redundant twister to determine the source of the loss. Management Station Switch/Hub w/snmp 2752-SS-01 "redundant twister" 2752-SS-01 "redundant twister" Switch/Hub w/snmp Management Station Broken Fiber Cable LED lit = established link Link Loss Carried LED unlit = no link IMPORTANT: When connecting a 2752-SS-01 GigE redundant twister to a port that supports auto-negotiation, it is strongly recommended to set both port settings to the same speed and duplex mode. This allows the GigE redundant twister to receive link pulses and select the active port. * The unit is shipped with the LLCF disabled. Metrobility GigE redundant twister 15

Copper Loss Carry Forward (CLCF) The copper-to-fiber GigE redundant twister (2752-1S-01) incorporates CLCF for identifying a lost copper connection. When CLCF is enabled, the fiber port s transmitter will shut down if the copper port stops receiving link pulses. The copper port, however, continually transmits link signals regardless of whether or not the fiber port receives link signals. The diagram below shows a typical network configuration with good link status using two GigE redundant twister units for remote connectivity. Note that CLCF is enabled as indicated. Management Station Switch/Hub w/snmp 2752-1S-01 "redundant twister" 2752-1S-01 "redundant twister" Switch/Hub w/snmp Management Station CLCF is ON CLCF is ON Copper Cable LED lit = established link Fiber Cable LED unlit = no link Copper Cable If a copper connection breaks, the redundant twister will carry that link loss forward. Management Station Switch/Hub w/snmp 2752-1S-01 "redundant twister" 2752-1S-01 "redundant twister" Switch/Hub w/snmp Management Station Broken Copper Cable CLCF is ON CLCF is ON Copper Loss Carried Forward LED lit = established link LED unlit = no link Loss of link at the fiber port is not propagated, as shown in the example below. Management Station Switch/Hub w/snmp LED lit = established link 2752-1S-01 "redundant twister" CLCF is ON Broken Fiber Cable LED unlit = no link 2752-1S-01 "redundant twister" CLCF is ON Switch/Hub w/snmp Management Station 16 User Guide

Switch On No Activity Received (SONAR) The GigE redundant twister is designed to protect a network from failure that would prevent data from reaching its destination. With SONAR enabled, the redundant twister monitors the active port for loss of data activity, as well as loss of valid link signals. SONAR enables the unit to automatically change the active port to its backup when the following two conditions occur: No data activity is detected on the active port for two (2) seconds. Data activity is detected on the backup port. To switch active ports, the backup port must have data activity within the two-second time out period when the active port lost activity. If both ports have no activity, the port that receives data activity first becomes the active port. The active port is switched immediately if it loses its link and the backup port has a link. To properly activate SONAR, make sure that the following switches are enabled: 1. RED switch. This sets the redundant twister to operate in Dynamic Recovery Mode. 2. LINK switch. This allows link signals to be sent out both ports. (Not applicable to the 2752-11-01.) 3. SONAR switch. The settings of the other DIP switches do not affect SONAR operation. However, SONAR will override the Auto Restore Primary Circuit (AUTO) switch. If both SONAR and AUTO are enabled, the active port will not automatically revert to PRIMARY (after switching to ONDARY) if PRIMARY has link but no activity. Data activity on PRIMARY must also be detected during the two-second time out period before the active port reverts back to PRIMARY. NOTE: The unit is shipped with SONAR disabled. Metrobility GigE redundant twister 17

Single Strand Fiber Failover Protection To ensure network resiliency in the event a single strand of fiber cable breaks or fails, the 2752-1S and 2752-SS (Rev B or higher for both models) provide failover protection by automatically forcing both ports to switch from Primary to Secondary. This maintains the continuous flow of data in both directions. Scenario The diagram below shows two 2752s connected together at the Primary and Secondary ports. All ports have good link status, and both units are operating in full-duplex mode with the Primary ports active. "redundant twister" A 2752 PRI MAIN = LED on = LED off MAIN PRI "redundant twister" B 2752 Problem The fiber strand carrying data from redundant twister B to A breaks, thus stopping the flow of data from B to A. "redundant twister" A 2752 PRI MAIN PRI MAIN "redundant twister" B 2752 18 User Guide

Solution To implement single-strand failover protection, enable the following DIP switches: RED, LINK AUTO, TX, and SONAR on each unit. The 2752s automatically perform the following operations to restore data activity. redundant twister A switches its active port from Primary to Secondary. redundant twister A stops transmitting data and link pulses through the Primary port. redundant twister B switches its active port from Primary to Secondary. Bi-directional traffic is now restored. active port switches to Secondary 2752 "redundant twister" A PRI MAIN no data, no link "redundant twister" B MAIN PRI active port switches to Secondary 2752 redundant twister A restarts transmitting link pulses on the Primary port. Result All data communications continue in both directions with the Secondary port active on both units. Revert to Primary The 2752s will revert to having the Primary port active if the following conditions are met: Both units receive valid link pulses on the Primary port. Both units detect data on the Primary port. Alternate Solution If you do not want bidirectional traffic resumed through the Secondary port when a single strand of fiber breaks, do NOT enable the four switches (RED, LINK, AUTO, and TX) at the same time on both units. This results in the transfer of data from B to A, but not from A to B. Metrobility GigE redundant twister 19

Back-to-Back Application A typical application of the GigE redundant twister is to use them in pairs to extend a network s reach between two remote devices. In the back-to-back setup, both PRIMARY ports are linked to each other and both ONDARY ports are linked as shown in the figure below. Server Cluster A Server Cluster B GigE "redundant twister" GigE "redundant twister" Main Links Primary Links Secondary Links In a back-to-back application, make sure that the following switches are enabled on both GigE redundant twister units: 1. RED switch. Sets the GigE redundant twister to operate in Dynamic Recovery Mode. In this mode, the ONDARY port automatically becomes the active port if the PRIMARY link is lost and the ONDARY link is present. 2. TX switch. Allows the GigE redundant twister to transmit data on both the PRIMARY and ONDARY ports simultaneously. The units must have this switch enabled because they cannot determine which port is active on the other GigE redundant twister. 3. LINK switch. This allows link pulses to be sent out both the PRIMARY and ONDARY ports. If neither ONDARY port is transmitting link pulses and one of the PRIMARY ports loses link, a switchover will NOT occur. A switchover will occur only if the ONDARY port has link. (LINK is not applicable to 2752-11-01.) 20 User Guide

Topology Solutions Server Cluster A Servers with 1000Mbps NICs Server Cluster B GigE "redundant twister" Main Link A Secondary Link A Primary Link B Main Link B GigE "redundant twister" Primary Link A Secondary Link B 1000Mbps Switch 1000Mbps Switch Enterprise Switch Twisted-pair Links Primary Link A Primary Link B Secondary Link A Secondary Link B Enterprise Metrobility GigE redundant twister 21

Changing the SFP Transceiver Depending on the model, the GigE redundant twister supports two or three replaceable small form-factor pluggable (SFP) transceivers. Metrobility SFP components are hot-swappable and can be changed without disrupting traffic on the other ports. This section explains how to remove and install SFP transceivers into the GigE redundant twister. IMPORTANT: Use only Metrobility-supplied SFP transceivers with this product. Installing any other part can damage the unit and will void the product s warranty. 1. Disconnect the fiber optic network cables, if they are installed, from both the transmitter (TX) and receiver (RX) ports on the SFP transceiver. WARNING: Avoid looking into the laser or cable. 2. To remove the SFP transceiver from redundant twister, simply pull open the release mechanism (i.e., plastic tab, bail latch, etc.) and slide the module out of the slot, as shown below, left. 2752 2752 1000 BASE "redundant twister" 1000 BASE "redundant twister" SW RESET SW RESET PRI MAIN PWR PRI MAIN PWR TX RX RELEASE MECHANISM BWDM SFP CIRCUIT BOARD THE BOTTOM 3. Align the new SFP module so the transmitter ( ) is positioned to the left of the receiver ( ). For a BWDM module, align the SFP transceiver so the visible part of the circuit board, located at the back of the module, faces down. 4. Keeping the release mechanism in the closed position (bail latch should be up over the transceiver), slide the new SFP module into the slot and push it firmly in place. 5. Remove the protective cover on the connector. 6. Reconnect the network cables. Verify proper segment connectivity via the green LED, which should be lit. 22 User Guide

Technical Specifications Data Rate Full duplex 1000 Mbps Power Requirements Input 90-240V AC 50/60 Hz Output +5V DC @ 2A Environmental Operating Temperature 0 to 50 C Storage Temperature -30 to 70 C Operating Humidity 5% to 95% non-condensing Dimensions 4.83"L x 3.26"W x 1.71"H (12.3 cm x 8.3 cm x 4.3 cm) 2752-11-01: 4.5"L x 5.75"W x 1.5"H (11.4 cm x 14.6 cm x 3.8 cm) Weight (including power supply) 3 lb, 1.36 kg 2752-11-01: 1.15 lb, 0.52 kg Twisted-Pair Interface Connector Shielded RJ-45, 8-pin jack Impedance 50 ohms nominal Signal Level Output (differential).95 to 1.05V Signal Level Input 200 mv minimum Supported Link Length 100 m Cable Type Category 5 STP * RJ-45 Pin Layout Pin # S ignal Pin # RJ-45 Pin Layout Signal 1 BI_DA+ 5 BI_DC- 2 BI_DA- 6 BI_DB- 3 BI_DB+ 7 BI_DD+ 4 BI_DC+ 8 BI_DD- Multimode Fiber Optic Plug-in (O211-M5) Connector LC Wavelength 850 nm RX Input Sensitivity -20 dbm (min), -22 dbm (typ), 0 dbm (sat) Output Power -9 dbm to -3.5 dbm; -6 dbm (typical) Typical Link Budget 16 dbm Supported Link Length up to 500 m Cable Type 50/125 or 62.5/125 µm multimode or 9/125 µm * An STP cable is required to comply with domestic and international electromagnetic interference (EMI) laws. Metrobility GigE redundant twister 23

Singlemode Fiber Optic Plug-in (O211-10) Connector LC Wavelength 1310 nm RX Input Sensitivity -20 dbm (min), -23 dbm (typ), -3 dbm (sat) Output Power -9.5 dbm to -3 dbm; -6 dbm (typical) Typical Link Budget 17 dbm Supported Link Length up to 10 km Cable Type 9/125 µm singlemode Singlemode Fiber Optic Plug-in (O211-25) Connector LC Wavelength 1310 nm RX Input Sensitivity -21 dbm (min), -23 dbm (typ), -3 dbm (sat) Output Power 0 dbm to 5 dbm; 2 dbm (typical) Typical Link Budget 25 dbm Supported Link Length up to 25 km Cable Type 9/125 µm singlemode Singlemode Fiber Optic Plug-in (O211-40) Connector LC Wavelength 1550 nm RX Input Sensitivity -24 dbm (min), -26 dbm (typ), -3 dbm (sat) Output Power -5 dbm to 0 dbm; -2.5 dbm (typical) Typical Link Budget 23.5 dbm Supported Link Length up to 40 km Cable Type 9/125 µm singlemode Singlemode Fiber Optic Plug-in (O211-70) Connector LC Wavelength 1550 nm RX Input Sensitivity -24 dbm (min), -26 dbm (typ), -3 dbm (sat) Output Power 0 dbm to 5 dbm; 2 dbm (typical) Typical Link Budget 28 dbm Supported Link Length up to 70 km Cable Type 9/125 µm singlemode 24 User Guide

Singlemode Fiber Optic Plug-in (O211-1A) Connector LC Wavelength 1550 nm RX Input Sensitivity -32 dbm (min), -34 dbm (typ), -3 dbm (sat) Output Power 0 dbm to 5 dbm; 2 dbm (typical) Typical Link Budget 36 dbm Supported Link Length up to 100 km Cable Type 9/125 µm singlemode Singlemode Fiber Optic Plug-in (O311-10-31, O311-10-49) for BWDM Connector SC Wavelength (O311-10-31) 1310 nm TX / 1490 nm RX Wavelength (O311-10-49) 1490 nm TX / 1310 nm RX RX Input Sensitivity -22 dbm (min), -24 dbm (typ), -3 dbm (sat) Output Power -9 dbm to -3 dbm; -6 dbm (typical) Typical Link Budget 18 dbm Supported Link Length up to 10 km Cable Type 9/125 µm singlemode Singlemode Fiber Optic Plug-in (O411-80-xx) for CWDM Connector LC Wavelength (see tables below) RX Input Sensitivity -24 dbm (min), -26 dbm (typ), -3 dbm (sat) Output Power 0 dbm to 5 dbm; 2 dbm (typical) Typical Link Budget 28 dbm Supported Link Length up to 80 km Cable Type 9/125 µm singlemode Model Number O411-80-31 O411-80-33 O411-80-35 O411-80-37 O411-80-39 O411-80-41 O411-80-43 O411-80-45 Wavelength Model Number 1310 nm O411-80-47 1330 nm O411-80-49 1350 nm O411-80-51 1370 nm O411-80-53 1390 nm O411-80-55 1410 nm O411-80-57 1430 nm O411-80-59 1450 nm O411-80-61 Wavelength 1470 nm 1490 nm 1510 nm 1530 nm 1550 nm 1570 nm 1590 nm 1610 nm Metrobility GigE redundant twister 25

Product Safety, EMC and Compliance Statements This equipment complies with the following requirements: UL CB CSA EN60950 (safety) FCC Part 15, Class A EN55022 Class A (emissions) EN55024: 1998 (immunity) IEC 825-1 Classification Class 1 Laser Product ICES-003 Class A (emissions) This product shall be handled, stored and disposed of in accordance with all governing and applicable safety and environmental regulatory agency requirements. The following FCC and Industry Canada compliance information is applicable to North American customers only. USA FCC Radio Frequency Interference Statement This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at the user s own expense. Caution: Changes or modifications to this equipment not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment. Canadian Radio Frequency Interference Statement This Class A digital apparatus meets all requirements of the Canadian Interference- Causing Equipment Regulations. Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur le matériel brouilleur du Canada. 26 User Guide

Warranty and Servicing Telco Systems Product Warranty TELCO MAKES NO WARRANTIES EXCEPT AS HEREIN SET FORTH: Telco warrants that the equipment and accessories manufactured by Telco, when used in the application and manner for which they are intended, will be free from defects caused by faulty material or poor workmanship from the date of shipment. This warranty is subject to change at any time. The warranty that applies is that which is in effect at the time the equipment ships. Warranty period is specific to particular product offerings. These periods are as follows: Metrobility Products- 1 year IP and EdgeGate Products 1 year Telco s liability under this warranty is limited to, the obligation, at Telco s sole option, to repair or, to replace at Telco s plant at Massachusetts, any part found to be defective under normal use and service within the warranty period specified herein, provided: a) Telco is promptly notified in writing upon discovery of such defects; b) The defective parts are returned to Telco, transportation charges prepaid in accordance with Telco s instructions; c) Telco s examination shall disclose to its satisfaction that such defects have not been caused by misuse, abuse, neglect, accident, or adjustments other than those specified in the Telco Operating and Maintenance Manual. Telco shall have no responsibility under this warranty for defects, which have been caused by misuse, abuse, improper application, repair, alteration, accident or negligence in use, storage, transportation or handling. Further, the original identification markings must not have been removed, defaced or altered. d) Equipment has been installed and operated, and maintained, in complete accordance with the Telco Operating and Maintenance Manual, and good engineering practice. Though component parts of Telco-manufactured goods are covered by the above warranty, TELCO MAKES NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE NOR ANY OTHER WARRANTY, EXPRESS OR IMPLIED, FOR ANY EQUIPMENT OR MERCHANDISE NOT MANUFACTURED BY TELCO (FOR EXAMPLE BUT WITHOUT LIMITION, ACCESSORIES AND AUXILIARY ITEMS). However, Telco will cooperate reasonably with Purchaser in attempting to secure, where possible, the benefit of any warranties which the manufacturer of such non-telco items may provide. All ordered replacement parts or parts replaced during the warranty period assume the unexpired portion of the original parts warranty or ninety (90) days from date of shipment, whichever is longer. Replacement, Repair or Refund Procedure for Hardware: Telco s sole obligation under this express warranty shall be, at Telco s option and expense, to repair the defective product or part or deliver to Customer an equivalent product or part to replace the defective item. All products that are replaced will become the property of Telco Systems. Replacement products or parts may be new or reconditioned. Telco warrants any replaced or repaired product or part for ninety (90) days from shipment, or the remainder of the initial warranty period, whichever is longer. Telco reserves the right to refund the purchase price paid for the defective product as its exclusive warranty remedy. To Receive a Return Materials Authorization (RMA) Number: Please contact the party from whom you purchased the product. If you purchased the product directly from Telco Systems, contact the Telco Systems Customer Care Group. Software: Telco warrants to Customer that each software program licensed from it will, if operated as directed in the user documentation, substantially achieve the functionality described in the user documentation for a period of ninety (90) days from the date of purchase from Telco or its authorized reseller. No updates or upgrades are provided under this warranty. Telco s sole obligation under this express warranty shall be, at Telco s option and expense, to refund the purchase price for the software product or replace the software product with software which meets the requirements of this warranty as described above. Customer assumes responsibility for the selection of the appropriate programs and associated reference materials. Telco expressly disclaims any warranty or representation that its software products will meet Customer s requirements or work in combination with any hardware or software products provided by third parties, that the operation of the software products will be uninterrupted or error free, or that all defects in the software products will be corrected. The foregoing warranties are in lieu of any and all other warranties, expressed or implied, including, but not limited to, warranties of merchantability, fitness for a particular purpose or against infringement of any rights of third parties. Telco s liability on any claim for money damages (including, without limitation negligence for any loss or damage arising out of, connected with, or resulting from the sale of products hereunder, or from the performance or breach thereof, or from the design, manufacture, sale, delivery, resale, installation, inspection, repair, operation or use of any merchandise manufactured by Telco) shall in no case exceed the price allocable to the merchandise or part thereof which gave rise to the claim. Purchaser will hold Telco harmless with respect to any claims or actions by third parties. In particular, Telco expressly disclaims and shall in no event be liable for any indirect, special, incidental or consequential damages. Metrobility GigE redundant twister 27

US Headquarters 2 Hampshire St., Ste. 3A Foxboro MA 02035 USA tel: 1.781.551.0300 fax: 1.781.255.2344 www.telco.com 5660-000049 G 12/06