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5-6 DCP Mode 2 Networks — Modem Pooling
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Basic Switch Needs
The switch must have the following circuit packs to support modem pooling:
• System 75, Generic 1, Generic 2 (universal module), or Generic 3:
— TN748C Tone Detector (System 75 requires a vintage 1 or vintage 3 board; Generic 1 and Generic 3
require vintage 3) — required in all carriers of a System 75, but not all carriers of a Generic 1
or Generic 3. (Do not use the TN748B, TN748D vintage 1, or the TN756.) For System 75,
Generic 1, and Generic 3, this board does not require assignment, but for Generic 2, it does (use
channels 4 and 8).
NOTE
The TN748D vintage 1 board does not currently work for this application. Also, any
existing TN748B tone detectors must be upgraded to TN748Cs.
— TN727 Network Controller (System 75) or TN777 Network Controller (Generic 1 and Generic 3) is
required.
— MT 771B Maintenance Test Circuit (Generic 2 universal module; equivalent to the SN261).
• System 85 or Generic 2 (traditional module):
— SN253 Auxiliary Tone Plant (one in each module used)
— SN255B or SN255C Tone Detector
— SN261B or SN261C Analog/Digital Facility Test Circuit
DCP Interface for the AUDIX Network Channels
The following digital lines are required to terminate the AUDIX network channels at the switch:
• System 75, Generic 1, or Generic 3:
Two TN754 Digital Line ports are required for the AUDIX DCP channels. Two more ports are
required if the AUDIX RS-232 channels are to be converted to DCP.
• Generic 2 (universal module):
Two TN754 Digital Line ports are required for the AUDIX DCP channels. Two more ports are
required if the AUDIX RS-232 channels are to be converted to DCP.
• System 85 or Generic 2 (traditional module):
Two SN270B General Purpose Port (GPP) ports are required for the AUDIX DCP channels. Two more
ports are required if the RS-232 channels are to be converted to DCP.