Modem Media Wiring (565-279, 566-338) Non-4100U/4100ES Only)
Important: Figure 30 applies only to non-4100U/4100ES systems.
Figure 30: Modem media wiring
1. All wiring is 24 AWG, twisted pair.
2. Connections between nodes can be made using unpowered (“dry”) copper wires or through powered (“wet”) leased lines.
3. Maximum cable distance between nodes when using short haul 24 AWG twisted pair is 15,000 feet.
4. Long haul telephone circuits must be private leased lines for analog data, point-to-point, full duplex, two-wire line interface with RJ-11
termination (where no line conditioning or signaling are required).
5. Modem media board power (565-279/566-338): 180 mA. Maximum at 5 +/- 0.25 VDC.
6. Modem media boards operate only at 9600 bps, with an 8-bit protocol.
7. Refer to general wiring precautions in this document, as well as Field Wiring Specifications: document 900-082 for 4100; 900-242 for
4100U/4100ES. Refer to Test Specification 576-241 for instructions on how to communicate with the modem.
8. When using a service modem, connect to the 565-516 or the 566-793 board using Cable 733-808 in shipping group 740-850. Use Cable
171-095 to connect the modem to a phone jack and/or a telephone termination block. Cut off one end of Cable 171-095 if connecting to
a telephone termination block. Strip back the cable to connect the two center wires to the red and green wires in the block. Refer to Test
Specification 576-241 for instructions on how to communicate with the modem. Place jumpers across 1-2 of P4 and 2-3 of P5.
9. When wiring leaves the building, 2081-9044 Overvoltage Protectors are required. One overvoltage protector is installed where wiring leaves
the building; another is installed where wiring enters the next building.
10. Modem media assemblies have part number 565-279 or 566-338.
11. A network can support can support up to 98 physical bridge nodes. Only four modems are permitted per network.
page 30 579-182 Rev. V
4100/4120-6014, 4100-6078 NICs and 4100/4120-Series Media Modules Installation Instruction
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