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Switched EIA RS-232 Networks 3-7
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SWITCHED RS-232 USING DATA MODULES FOR DCP
By using a data module instead of a modem, the RS-232 channel becomes a DCP channel, at least as far as
the switch and the switch network is concerned. RS-232 channels can be converted to DCP mode 1, DCP
mode 2, or DCP mode 3. See Figure 3-5, Converting RS-232 Channels to DCP.
• To convert to DCP mode 1 (56 Kbps) or DCP mode 3 (64 Kbps), use a Modular Processor Data
Module, Model M1* (MPDM/M1*). In either of these cases, the channels can only be used for
incoming calls; they cannot be used for outgoing calls. All outgoing calls must use the DCP ports.
• To convert to DCP mode 2, use a 7400A or 7400B Data Service Unit (DSU). In this case, the channels
can be used for incoming or outgoing calls.
Converting RS-232 channels to DCP is particularly useful for System 75, Generic 1, Generic 3, and
MERLIN II where a DCP network is desired. Adding the two converted channels to the regular two DCP
channels creates a total of four DCP channels. (If the customer desires, these channels can be left as RS-
232 channels giving two RS-232 and two DCP channels, again for a total of four channels. See Chapter 7,
Mixtures of RS-232 and DCP Networks, for examples.)
DCP
DCP
(Two Channels)
(Four Channels)
Sys 85
or G2
AUDIX
RS-232
NOTE: The 7400A and 7400B
data modules are
bi-directional;
the MPDM/M1* is for
incoming calls only.
Public/Private
Interlocation
Facilities
H600-331
Group 2
Sys 75,
G1, or
G3
H600-331
Group 2
RS-232
AUDIX
(Two Channels)
(Two Channels)
DCP
DCP
Data
Module
Data
Module
Figure 3-5. Converting RS-232 Channels to DCP