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6-2 DCP Mode 3 Networks — 64 Kbps
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GENERAL INFORMATION
DCP Mode 3 networks use the DCP interface on the AUDIX system and on the switch. Since the AUDIX
connections are switched, the AUDIX channels can be shared with the CDR application. For colocated
AUDIX systems, communication between AUDIX systems is directly from one switch DCP port to
another. Figure 6-1, DCP Mode 3 Network for A Single Switch, shows how this is done with a System 75,
System 85, Generic 1, Generic 2, or Generic 3. Figure 6-2, DCP Mode 3 Network for A Non-DCP Switch,
shows how the MERLIN II performs this function for a non-DCP switch.
When the AUDIX systems are at different customer locations serving separate switches, interlocation
facilities are usually T1 Carrier with a Digital Service 1 (DS1) interface at the switches providing the
termination.
AUDIX SYSTEM REQUIREMENTS FOR DCP MODE 3
Each AUDIX system must be running R1V3 or later software and must be equipped with one of the
following:
• TN366 AUDIX Communications Controller (ACC) circuit pack
• TN366B ACC circuit pack
• TN539 ACC Enhanced (ACCE) circuit pack
• TN539B ACCE circuit pack
If the AUDIX system is linked to a Generic 2 universal module, the TN366B or TN539 or TN539B must be
used if the customer requires all four DCP channels. If a TN366 is used, only channels 1 and 3 can be used.
If the AUDIX system is linked to a MERLIN II, the TN366B, TN539, or TN539B must be used.
In addition, for MERLIN II, the following is required:
• MERLIN II control unit (power/processor/base)
• Feature Module II
• Feature Module III
• 008D digital station module
• 356A adapter (one per AUDIX system), comcode 104158829
• DW8-87 modular cord (two per AUDIX system), comcode 102796950
The AUDIX Networking Breakout cable (H600-331, Group 1 or Group 2) provides access to the DCP
channels at the AUDIX system. Also, each AUDIX system must be within 5000 cable feet (1525 meters)
of the switch’s DCP interface.