Example Transport Engineering Guide (TEG): Artel DL1220 and DL2701 Broadcast Video -48VDC applications

Example Transport Engineering Guide (TEG): Artel DL1220 and DL2701 Broadcast Video -48VDC applications BOTC-TEG-1250 Section Table of Contents Page DS Data Sheet (weight, footprint, power, heat, timing, alarms/rm, DF blocks, CLEI) 2 1 Overview 3 2 Equipment requirements 4 3 Relay rack layout 5 4 System connection details 6-9 Issue Revisions Date 1 Original release of Bill Oakes Engineering Guide for Artel DL1220/2701 September 14, 2006 5 Revise into Word format. October 19, 2007 Acronyms: American Wire Gauge (AWG), Battery Distribution Fuse Board (BDFB), Central Office (CO), Digital Cross connect System-electronic (DCS), Digital System Cross connect-manual (DSX), Distributing Frame (DF), Enclosed Network Extension-RT/CEV/Hut/Prem (ENE), Fiber Distribution Frame (FDF), National Television Systems Committee (NTSC), Network Element (NE), Receive (RX), Serial Digital Interface (SDI), Society of Motion Picture and Television Engineers (SMPTE), Support Engineering Guide (SEG), Transmit (TX). Bill Oakes Telecom Consultants (BOTC) bill.oakes@att.net, 831-476-0453 Copyright 2006. All rights reserved. 1

Data Sheet: The preface section of all BOTC-TEGs is a data sheet that provides quick view information for weight, relay rack footprint, peak (LIST 2)/nominal (LIST 1) power amperage, heat dissipation wattage, timing, alarms/remote management, DF block and CLEI code requirements. The data shown is an ultimate condition (relay rack fully loaded with equipment as designed in associated BOTC-TEG). Even though many relay rack deployments are partially equipped, BOTC recommends basing initial space/engineering planning on ultimate data since existing rack layouts typically grow to conclusion without follow-up involvement by planning personnel. Category Weight Footprint Peak/LIST 2 amperage at 42.6V Nominal/LIST 1 amperage at 52V Heat dissipation Timing (BITS) Alarms Remote management DF blocks CLEI codes (see BOTC-SEG-0600 section 4) Data sheet for Artel DL1220 and DL2701 relay rack Requirement Remarks 310 pounds One relay rack: 120 pounds. One fuse panel: 10 pounds. Thirty fully equipped DL1220 or DL2701 shelves (6 pounds each): 180 pounds. 26" wide x 15" deep See remarks See remarks See remarks N/A 3 discrete N/A N/A PWFYAL2CAA VLMA3ZY1RA VLMA6ZY1RA VLM1X00ERA VLM1500GRA 26" wide rack. 5" deep front and rear guard boxes. 39 amps if all 30 shelves are DL1220 or 18 amps if all 30 shelves are DL2701. If rack is expected to have a mixture of the two shelf types, calculate LIST 2 total by using 1.3 amps for each DL1220 shelf and 0.6 amps for each DL2701 shelf. 28.8 amps if all 30 shelves are DL1220 or 14.4 amps if all 30 shelves are DL2701. If rack is expected to have a mixture of the two shelf types, calculate LIST 1 total by using 0.96 amps for each DL1220 shelf and 0.48 amps for each DL2701 shelf. 900 watts if all 30 shelves are DL1220 or 750 watts if all 30 shelves are DL2701. If rack is expected to have a mixture of the two shelf types, calculate total by using 30 watts for each DL1220 shelf and 25 watts for each DL2701 shelf. No timing requirement for DL1220 or DL2701 racks. 1 status point required on CO alarm system for rack fuse panel alarm. Each DL1220 or DL2701 shelf has two (MJ and MN) discrete alarms that mult within the rack (only shelf 1 cabled out of rack to CO alarm system status points). See section 4 part D for potential microwelding issue. No Ethernet or RS232 remote management requirements for DL1220 or DL2701 racks. No DF connection for DL1220 or DL2701 racks. Telect 0HPGMT07R fuse panel. Artel DL1220 Encoder shelf. Artel DL1220 Decoder shelf. Artel DL2701 Encoder shelf. Artel DL2701 Decoder or Optical Repeater shelf. 2

1. Overview: Broadcast Video equipment transports wholesale customer signal content through a Service Provider/Telco network for eventual handoff at that same wholesale level. For example, the origination of nationwide/local TV programming routes to the nearest Service Provider/Telco CO or ENE. Signals are then transported to a cable TV company (wholesale handoff at interface point) who bundles the service into channel packages for resale to customers (individual homes) at the retail level. Many Service Providers/Telcos are now building their own Retail Video service network. In this case, Broadcast Video equipment is still used to collect and transport nationwide/local TV programming but the signals hand off to Retail Video systems within the Service Provider/Telco network. For Retail Video examples, see the overview section of BOTC-TEG-1150 (Alcatel 7330 Fiber To The Node) and BOTC-TEG-1160 (Alcatel 7342 Fiber To The Prem or User). Artel DL1220 and DL2701 are single channel digital Broadcast Video fiber transport systems. DL1220 shelves can be configured for service type A or B below. DL2701 shelves are configured for service type B only. A) National Television Systems Committee (NTSC) analog TV1 service. Drop side is one 6 MHz video channel and 0, 2 or 4 associated audio circuits (15 or 20 KHz each). As with most analog systems in the industry, separate cabling is used for electrical video and audio to maintain good dynamic sound quality. See Telcordia GR-338- CORE for additional details. B) Society of Motion Picture and Television Engineers (SMPTE) 259M Serial Digital Interface (SDI) 270 Mb/s service. Drop side is one 270 Mb/s combined audio/video channel. DL1220 and DL2701 shelves can be ordered as an encoder (drop side audio/video RX, line side fiber TX) or decoder (line side fiber RX, drop side audio/video TX). DL2701 decoder shelves can also be set up as an optical repeater (fiber RX, fiber TX). Audio/video circuits can be cabled to special audio/video cross connect patch panels or directly to other video equipment (hardwire). Prior to engineering Broadcast Video jobs, vendors should consult with Service Provider/Telco personnel about the connection method between systems. Broadcast Video equipment should not be connected to DSX or DCS due to it s unique signal format. See BOTC-SEG-0100 section 13 for NTSC TV1 audio cable methods. See BOTC-SEG-0200 section 7 for SMPTE SDI audio/video and NTSC TV1 video coax methods. 3

2. Equipment requirements: This section provides part number and mounting/usage details for equipment in DL1220 and DL2701 relay racks. See section 3 figure 3 for assembly details. Plug-ins are listed here but they may be ordered separately via Service Provider/Telco Plug-in Inventory Control System (PICS) routines. A) Relay rack: One 7 Network rack with 1.75 x 23 drilling and 5 front welded guard box. See BOTC-SEG-0600. B) Rear guard box: One 5 rear field mount guard box must be ordered as a separate item so that the footprint depth is 15 (5 front, 5 rear). See BOTC-SEG-0600. C) Fuse panel: One Telect 0HPGMT07R. 1.75 high. See BOTC-SEG-0500. D) DL1220 encoder shelf: Artel part number 390-000681-48 provides model DL1220E-48 single channel video encoder shelf with TV1 or SDI interface, NTSC test signal generator, TX 1310nm FC/PC optics and -48VDC power. E) DL1220 decoder shelf: Artel part number 390-000683-48 provides model DL1220D-48 single channel video decoder shelf with TV1 or SDI interface, NTSC test signal generator, RX 1200-1600nm FC/PC optics and -48VDC power. F) DL2701 encoder shelf: Artel part number 390-000691-48 provides model DL2701E-48 single channel video encoder shelf with SDI interface and -48VDC power. Always requires one separately ordered WLXX laser cartridge (see part H or J). G) DL2701 decoder or optical repeater shelf: Artel part number 390-500693-48 provides model DL2701DX-48 single channel video decoder or optical repeater shelf with SDI interface, RX 1200-1600nm FC/PC optics and -48VDC power. Only requires one separately ordered WLXX laser cartridge (see part H or J) for optical repeater function. H) 1310nm laser cartridge for DL2701 encoder or optical repeater shelf (PICS item?): Artel part number 390-000660-13 provides model WL13 laser cartridge with TX 1310nm FC/PC optics. J) 1550nm laser cartridge for DL2701 encoder or optical repeater shelf (PICS item?): Artel part number 390-000660-15 provides model WL15 laser cartridge with TX 1550nm FC/PC optics. K) Optional combined audio/video patch panel: Not required if video systems are hardwired. See part L and M if separate audio and video patch panels are used. Bittree part number SBCIPS01 provides patch panel with 16 video jack circuits (1 to 8 upper, 1 to 8 lower) and 64 audio jack circuits (1A to 8D upper, 1A to 8D lower). Cross connects are internally hardwired (video 1 upper to video 1 lower, audio 1A upper to audio 1A lower, etc). L) Optional audio patch panel: Not required if video systems are hardwired. See part K if combined audio/video patch panel is used. ADC part number PPS3-14MKIIHN provides patch panel with 48 audio jack circuits (1 to 24 upper, 25 to 48 lower). Cross connects are internally hardwired (1 to 25, 2 to 26, etc). M) Optional video patch panel: Not required if video systems are hardwired. See part K if combined audio/video patch panel is used. ADC part number PPI2232RS-MVJ provides patch panel with 64 video jack circuits (1 to 32 upper, 33 to 64 lower). Cross connects are internally hardwired (1 to 33, 2 to 34, etc). 4

3. Relay rack layout: BOTC-TEG-1250 BV or 43 Fuse panel BU or 42 BT or 41 BS or 40 DL1220 or DL2701 30 INSTALLATION: BR or 39 DL1220 or DL2701 29 BQ or 38 DL1220 or DL2701 28 BP or 37 DL1220 or DL2701 27 BN or 36 DL1220 or DL2701 26 BM or 35 DL1220 or DL2701 25 BL or 34 DL1220 or DL2701 24 BK or 33 DL1220 or DL2701 23 BJ or 32 DL1220 or DL2701 22 BH or 31 DL1220 or DL2701 21 BG or 30 DL1220 or DL2701 20 BF or 29 DL1220 or DL2701 19 BE or 28 DL1220 or DL2701 18 BD or 27 DL1220 or DL2701 17 BC or 26 DL1220 or DL2701 16 BB or 25 BA or 24 V or 23 U or 22 T or 21 S or 20 R or 19 Q or 18 P or 17 Area for optional audio/video patch panels N or 16 DL1220 or DL2701 15 M or 15 DL1220 or DL2701 14 L or 14 DL1220 or DL2701 13 K or 13 DL1220 or DL2701 12 J or 12 DL1220 or DL2701 11 H or 11 DL1220 or DL2701 10 G or 10 DL1220 or DL2701 9 F or 9 DL1220 or DL2701 8 E or 8 DL1220 or DL2701 7 D or 7 DL1220 or DL2701 6 C or 6 DL1220 or DL2701 5 B or 5 DL1220 or DL2701 4 A or 4 DL1220 or DL2701 3 AA or 3 DL1220 or DL2701 2 AB or 2 DL1220 or DL2701 1 AC or 1 AD or 0 1.75 x 23 1. DL1220 and DL2701 shelves are 1.75" high, 19" wide and 10.5" deep (including rear fan unit). 19" to 23" rack adapters and 5" front stand-offs must be provided by you. 5" front set out for shelves allows rear side fiber and coax bend to stay within footprint of 5" rear guard box. 2. Each DL1220 and DL2701 shelf requires one rear tie bar (flat with 4" set out) that must be provided by you. This will protect shelf backplane connections from rear aisle activity. 3. Each of the optional patch panels needs 19" to 23" rack adapters and 5" front standoffs that must be provided by you. 4. ADC PPS3-14HKIIHN audio patch panels are 3.5" high, 14" deep and 19" wide. 5. ADC PPI2232RS-MVJ video patch panels are 3.5" high, 9" deep and 19" wide. 6. Bittree SBCIPS01 audio/video patch panels are 3.5" high, 12.5" deep and 19" wide. FIGURE 3 Layout for Artel DL1220 and DL2701 shelves. Provide rear side 2" x 2" vertical fiber protection duct on right upright (as viewed from rear of rack) down to shelf 1 level. 30 shelf limit due to heat dissipation (sum of shelves equals rack footprint allowance using BOTC-SEG-0600 section 8A method). 5

4. System connection details: A) Fuse panel: Step 1 (Single load input feeder from BDFB): See BOTC-SEG-0500 section 11 for BDFB fuse/feeder sizing responsibility and BOTC-SEG-0700 section 9 for wire material. Provide 2 two hole lugs (.25 studs on.625 centers) for input feeder connections (wire size determined by vendor based on job conditions). Total LIST 2 can be 39 amps (all 30 shelves are DL1220) or 18 amps (all 30 shelves are DL2701). If rack is expected to have a mixture of two shelf types, calculate LIST 2 total by using 1.3 amps for each ultimate DL1220 shelf and 0.6 amps for each ultimate DL2701 shelf. Step 2 (Chassis ground): Provide 1 two hole lug (No.10 studs on.625 centers) for 6 AWG wire. Lug must have 45 degree tongue due to adjacent GMT output terminal block (cannot use flat lug) and panel rear cover (cannot use 90 degree lug). Connect lug to relay rack ground using 6 AWG wire (see BOTC-SEG-0700 section 7 and 9). Step 3 (Alarms): Run 24 AWG Black and Red-Black wire pair (see BOTC-SEG-0700 section 8) from fuse panel R set NO/C wire wrap pins to CO alarm system (Dantel for example) status point. No connection for V and A set pins. B) Power for DL1220 and DL2701 shelves: Step 1 (intra-rack wiring): Connect (-48V) and + (Return) symbol screws to fuse panel output positions using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RETURN. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminals for shelf end and RA484 ring terminals for fuse panel end. Step 2 (fuse panel fuses and designation pins): Maximum drain is shown in part A. Fuse externally at 2 amp. Disregard 10 amp external fusing recommendation shown in Artel documentation. See BOTC-SEG-0500 section 14 for GMT fuse and designation pin part numbers. C) Chassis ground for DL1220 and DL2701 shelves: Step 1 (intra-rack wiring): Connect ground symbol screw to relay rack ground using spare 22 AWG Black wire from part B. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for shelf end. D) Alarms for DL1220 and DL2701 shelves: DL1220 and DL2701 internal alarm contacts have an unusually low 0.100 amp rating. The interface to remote (Westronic for example) or combined local/remote (Dantel for example) CO alarm systems is not an issue since their status points generate no more than a 0.090 amp load. Some COs may have older alarm systems (Lucent NJ01046 or NJ01207 for example) that can place higher loads (0.200 amp for NJ) on individual NE alarm contacts. NE internal alarm contacts can act as a capacitor that is constantly being charged by the external alarm system. When the NE internal alarm relay operates, inrush current occurs across the contacts. If inrush current exceeds the NE alarm contact rating, internal relays may microweld in the closed position. This causes alarm indications to continue after the NE failure has cleared (known as a standing alarm). Prior to connecting alarms on DL1220 and DL2701 shelves, vendors should investigate the CO alarm system status point amperage load. If this load exceeds 0.090 amp, consult with Service Provider/Telco personnel. In some cases, their Broadcast Video network may have a maintenance center that can monitor video picture quality (as an indicator of shelf failure) instead of relying on shelf relays to report failure via a CO alarm system. Step 1 (mount wire clamp connectors): Six wire clamp connectors (three pin for 18 to 24 AWG range) are included with each DL1220 and DL2701 shelf. Two of these connectors are used for alarms and four are used for part L audio wiring. Mount the connectors in ALARM LOCAL MAJOR and LOCAL MINOR positions (rear of shelf). Step 2 (alarm wiring): Run 24 AWG Yellow/Yellow-Green, Red/Red-Green wire quad (see BOTC-SEG-0700 section 8) from ALARM LOCAL MAJOR and LOCAL MINOR NO (alarm lead) and C (return lead) contacts to CO alarm system (Dantel for example) status points (shelf 1 only) or preceding shelf in same rack (shelves mult together in rack with only shelf 1 cabled out). 6

E) Fiber for DL1220 encoder shelf: Step 1 (run fiber conductor): Use OPTICAL OUTPUT port (FC connector) on shelf backplane. Run one TX fiber conductor (see BOTC-SEG-0400) from shelf to the FDF. Per section 3 figure 3, vertical duct material should be provided on rear side of right (as viewed from rear of rack) upright. F) Fiber for DL1220 and DL2701 decoder shelves: Step 1 (run fiber conductor): Use OPTICAL INPUT port (FC connector) on shelf backplane. Run one RX fiber conductor (see BOTC-SEG-0400) from shelf to the FDF. Per section 3 figure 3, vertical duct material should be provided on rear side of right (as viewed from rear of rack) upright. G) Fiber for DL2701 encoder shelf: Step 1 (mount laser cartridge): Mount laser cartridge (provided in section 2 part H or J) in OPTICAL OUTPUT position on rear of shelf. Step 2 (run fiber conductor): Use OPTICAL OUTPUT port (FC connector) on laser cartridge. Run one TX fiber conductor (see BOTC-SEG-0400) from shelf to the FDF. Per section 3 figure 3, vertical duct material should be provided on rear side of right (as viewed from rear of rack) upright. H) Fiber for DL2701 optical repeater shelf: Step 1 (mount laser cartridge): Mount laser cartridge (provided in section 2 part H or J) in OPTICAL OUTPUT position on rear of shelf. Step 2 (run fiber conductors): Use OPTICAL OUTPUT port (FC connector) on laser cartridge for TX and OPTICAL INPUT port (FC connector) for RX. Run two fiber conductors (see BOTC-SEG-0400) from shelf to the FDF. Per section 3 figure 3, vertical duct material should be provided on rear side of right (as viewed from rear of rack) upright. J) SDI 270 Mb/s audio/video coax for DL1220 and DL2701 shelves: Step 1 (consult with Service Provider/Telco about connection method): Audio/video coax circuits can be cabled to special audio/video cross connect patch panels or directly to other video equipment (hardwire). Prior to engineering, vendors must consult with Service Provider/Telco personnel about the connection method between systems. Broadcast Video equipment should not be connected to DSX-3 or DCS due to it s unique signal format. Step 2 (run coax conductor): Use SDI INPUT port (if encoder), SDI OUTPUT port (if DL1220 decoder) or SDI OUT 1 port (if DL2701 decoder) on shelf backplane. Provide one straight BNC connector. Run one RX (if encoder) or TX (if decoder) coax conductor from shelf to video patch panel (see part M or N) or other video equipment (hardwire with roll of TX to RX or RX to TX). See BOTC-SEG-0200 section 7 for BNC and coax material. K) TV1 6 MHz video coax for DL1220 shelf: Step 1 (consult with Service Provider/Telco about connection method): Audio/video coax circuits can be cabled to special audio/video cross connect patch panels or directly to other video equipment (hardwire). Prior to engineering, vendors must consult with Service Provider/Telco personnel about the connection method between systems. Broadcast Video equipment should not be connected to DSX-3 or DCS due to it s unique signal format. Step 2 (run coax conductor): Use VIDEO INPUT port (if encoder) or VIDEO OUTPUT port (if decoder) on shelf backplane. Provide one straight BNC connector. Run one RX (if encoder) or TX (if decoder) coax conductor from shelf to video patch panel (see part M or N) or other video equipment (hardwire with roll of TX to RX or RX to TX). See BOTC-SEG-0200 section 7 for BNC and coax material. 7

L) TV1 15-20 KHz audio cable for DL1220 shelf: Step 1 (consult with Service Provider/Telco about connection method): Audio cable circuits can be cabled to special audio/video cross connect patch panels or directly to other video equipment (hardwire). Prior to engineering, vendors must consult with Service Provider/Telco personnel about the connection method between systems. Broadcast Video equipment should not be connected to DSX-1 or DCS due to it s unique signal format. Step 2 (consult with Service Provider/Telco about number of audio circuits): NTSC TV1 service consists of one 6 MHz video channel and 0, 2 (shelf circuit A and B) or 4 (shelf circuit A, B, C and D) associated audio circuits (15 or 20 KHz each). Prior to engineering, vendors must consult with Service Provider/Telco personnel about the required number of audio circuits. Step 3 (mount wire clamp connectors): Six wire clamp connectors (three pin for 18 to 24 AWG range) are included with each DL1220 and DL2701 shelf. Two of these connectors are used for part D alarms and four are used for audio wiring. Mount the connectors in AUDIO INPUT (if encoder) or AUDIO OUTPUT (if decoder) position A, B, C and D slots. Step 4 (run audio cable): Each of the A, B, C and D connectors has three pins designated GND, + and. Use GND for the cable pair drain wire, + for the Tip lead (Red) and for the Ring lead (Black). Run one RX (if encoder) or TX (if decoder) cable with required number of pairs from shelf to audio patch panel (see part P or Q) or other video equipment (hardwire with roll of TX pair to RX pair or RX pair to TX pair, do not roll Tip and Ring leads with a pair). See BOTC-SEG-0100 section 13 for cable material and methods. M) SDI or TV1 coax connection to video jacks on optional Bittree SBCIPS01 patch panel: Step 1 (stencil panel): SBCIPS01 panel jacks are factory stenciled on the rear side. On the front side upper and lower strip labels (provided with panel), stencil each group of two upper/lower video jacks as 1, 2, 3, 4, 5, 6, 7, 8 reading left to right. Step 2 (consult with Service Provider/Telco about assignments): Since patch panel circuits are internally hardwired, connection of coax from one video system on an upper or lower jack will automatically associate it with another video system that may be terminated on the corresponding lower or upper jack. Prior to engineering, vendors must consult with Service Provider/Telco personnel about patch panel assignments. Step 3 (connect coax conductor): Provide one straight BNC connector (see BOTC-SEG-0200 section 7). Connect coax conductor from part J or K. N) SDI or TV1 coax connection to video jacks on optional ADC PPI2232RS-MVJ patch panel: Step 1 (stencil panel): PPI2232RS-MVJ panel jacks not are factory stenciled. On the front side, stencil upper left jack as 1, upper right as 32, lower left as 33 and lower right as 64. On the rear side, stencil upper left as 32, upper right as 1, lower left as 64 and lower right as 33. Step 2 (consult with Service Provider/Telco about assignments): Since patch panel circuits are internally hardwired, connection of coax from one video system on an upper or lower jack will automatically associate it with another video system that may be terminated on the corresponding lower or upper jack. Prior to engineering, vendors must consult with Service Provider/Telco personnel about patch panel assignments. Step 3 (connect coax conductor): Provide one straight BNC connector (see BOTC-SEG-0200 section 7). Connect coax conductor from part J or K. 8

P) TV1 cable connection to audio jacks on optional Bittree SBCIPS01 patch panel: Step 1 (stencil panel): SBCIPS01 panel jacks are factory stenciled on the rear side. On the front side upper and lower strip labels (provided with panel), stencil each group of eight upper/lower audio jacks as 1, 2, 3, 4, 5, 6, 7, 8 reading left to right. Also stencil each set of eight audio jacks (within each overall group) as A, B, C, D reading left to right. Step 2 (consult with Service Provider/Telco about assignments): Since patch panel circuits are internally hardwired, connection of audio cable pairs from one video system on an upper or lower jack will automatically associate it with another video system that may be terminated on the corresponding lower or upper jack. Prior to engineering, vendors must consult with Service Provider/Telco personnel about patch panel assignments. Step 3 (mount mating connectors): 64 mating connectors (three screw for 22 to 26 AWG range) are included with each SBCIPS01. The screws are designated H (for High), L (for Low) and S (for Sleeve). Mount the connectors in 1A to 8D upper and 1A to 8D lower audio jack positions. Step 4 (connect cable pairs): Connect cable pairs from part L. Tip (Red) lead to H screw and Ring (Black) lead to L screw. Step 5 (connect drain wire for each pair): Each cable pair has an individual drain wire that must be connected to the mating connector S screw. SBCIPS01 panels have internal factory straps between associated upper and lower S screws. This meets the BOTC-SEG-0100 section 13 part C ground continuity requirement. Q) TV1 cable connection to audio jacks on optional ADC PPS3-14MKIIHN patch panel: Step 1 (consult with Service Provider/Telco about assignments): Since patch panel circuits are internally hardwired, connection of audio cable pairs from one video system on an upper or lower jack will automatically associate it with another video system that may be terminated on the corresponding lower or upper jack. Prior to engineering, vendors must consult with Service Provider/Telco personnel about patch panel assignments. Step 2 (connect cable pairs): Connect cable pairs from part L. Tip (Red) lead to T punch down connector and Ring (Black) lead to R. Step 3 (connect drain wire for each pair): Each cable pair has an individual drain wire that must be connected to the S punch down connector. Since PPS3-14MKIIHN panels do not have internal factory straps between upper and lower S connectors, add a 22 AWG bare wire strap between each set of associated upper and lower S. This meets the BOTC-SEG-0100 section 13 part C ground continuity requirement. The panel has 1-24 and 25-48 ground symbol lugs but connection is not required since the panel is not used to ground audio cables (ground continuity passes through panel via straps between S connectors). 9