NEC nd-20292 manual Feet Max, On both Ends, Shown in Figure, To pins

ND-20292

CHAPTER 2

APRIL, 1990

	RS-232C	MALE	RS-232C	MALE
	CONNECTOR		CONNECTOR
7	.	SC	SG .	7

22 .		RI			RI l	22
11	0					11
CABLE LENGTH:		50 feet	(15 m) max.
CABLE TYPE:		Twisted	pair	shielded	RS-232C cross cable with	RS-232C male
		connectors		on both	ends.

NOTE: The special null modem cable has pin 22 crossed to pin 11.

Figure 20054 Wiring Connections of RS-232C Cross Cable for Connecting a Modem to a DTA-E (Rev. 1 only) Unit.

the AC/DC adaptor	into the DTA-E Unit as	c. Connect	the SLI	tip and ring to be used for the
shown in Figure 200-44.		modem,	to pins	7 and 8 of the ACU interface
		female	connector.

Dl. Installing keyboard dial/auto answer modems: Use a modular ended line cord to connect the modem to a vacant SLI-E( 1 ETU port that is programmed for the same modem connection as in Step A. Proceed to Step E.

d.Plug the female ACU interface connector into the male interface connector on the back of the modem.

D2. Installing non keyboard dial/auto answer modems:

An Automatic Control Unit (ACU) interface connector is provided with the modem. This connector must be wired to the single line tip and ring, and to the PWR relay contact of the DTA-E Unit The interface connector is connected as shown in Figures 200-54 and 200-55.

a.Remove the DTA-E Unit from the Multiline Terminal being connected to the modem. Plug in the PWR contact plug in the CN-2 socket of the DTA-E Unit. Refer to Figure 200-56.

b.Connect the other end of the PWR cable (red and white wires) to the TD (pin 5) and TDG

(pin 25) of the ACU interface female connector provided with the modem.

E.Set the baud rate of the modem to 300 or 1200, as required. This setting must be set to the same baud rate normally used by the distant modem when using modem pooling.

F.Set up the necessary parameters of the modem;

(refer to the instructions provided with the

modem). If the modem is used for incoming modem pool use, the modem auto answer mode must be enabled.

G.Connect one end of a special null modem RS- 232C cross cable to the RS-232C connector of the DTA-E Unit. Refer to Figures 200-54 and 200-55.

H.Secure the RS-232C connector with the screws provided with the RS-232C cable.

I.Connect the other end of the RS-232C cable to the modem, as described in the instructions provided with the modem.

200 - 45