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4-2 DCP Mode 1 Networks — 56 Kbps
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NOTE
MERLIN II, System 75, and DEFINITY Generic 1 and Generic 3 can only access two of the
four DCP channels. This is a limitation regardless of the AUDIX software and networking
circuit pack used. See Chapter 3, Switched EIA RS-232 Networks, for information on
expanding this limitation to four channels by adding the AUDIX RS-232 channels.
GENERAL INFORMATION
To use DCP Mode 1 as the transmission protocol, the switch must be set up to access a switched network at
56 Kbps via robbed-bit facilities. These special access lines can be either Dataphone Digital Service (DDS)
or ACCUNET T1.5, SDN service providing access to either a static or dynamic Serving Office (SO), or
compatible services provided by other vendors. Currently the System 75, System 85, DEFINITY Generic
1, Generic 2, or Generic 3 can provide this type of access. However, System 85 (R2V3 or R2V4) does not
support dynamic access. Up to six channels on the 56 Kbps service facility may be required at any one
time for System 85 and Generic 2 and up to four channels for System 75, Generic 1, and Generic 3.
Figure 4-1, DCP Mode 1 Network Using Switched 56 Service, shows an arrangement where AUDIX
networking is accomplished via 56 Kbps services. Figure 4-2, PC Added to A DCP Network, shows a
network of R1V5 or later AUDIX systems with RS-232 access. When RS-232 is available, the customer
has a choice of connecting a PC for the CDR feature via dedicated or switched RS-232 (dedicated RS-232
is shown in Figure 4-2).
NOTE
If the customer does not subscribe to switched 56 service, check with the DCP Mode 2, DCP
Mode 3, and RS-232 network alternatives before setting up a switched 56 Kbps facility.