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DCP Mode 3 Networks — 64 Kbps 6-5
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• System 85 or Generic 2 (traditional module):
Two SN270B General Purpose Ports are required per AUDIX system. Although not required, it is
recommended that the ports be on separate packs. Then not all four network channels will be lost in the
event a single pack goes bad.
• MERLIN II (for colocated systems only)
Two ports on an 008D Digital Line card; the MERLIN II must be equipped as specified earlier in this
chapter in AUDIX System Requirements for DCP Mode 3.
When the AUDIX RS-232 channels are converted to DCP, two more ports are required.
Interlocation Requirements
In addition to the requirements listed in the previous paragraphs, a T1 Carrier (DS1 Interface set for
Alternate Voice/Data) or the B-channels of an Integrated Systems Digital Network (ISDN) span must be
provided for networking between locations.
NOTE
The BCSDC will design networks using ISDN.
The switch must have the following circuit packs:
• 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