AT&T 585-300-903 manual Switched RS-232 Using Data Modules for DCP, Dcp

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.)

Sys 75,

G1, or

G3

Public/Private

Interlocation

Facilities

NOTE: The 7400A and 7400B data modules are bi-directional;

the MPDM/M1* is for incoming calls only.

DCP	(Two Channels)
			AUDIX
DCP		RS-232
	Data
	Module
(Two Channels)		H600-331
		Group 2

	DCP	(Four Channels)
Sys 85
or G2			RS-232	AUDIX
	DCP
		Data
		Module
	(Two Channels)		H600-331
			Group 2

Figure 3-5.Converting RS-232 Channels to DCP