Avaya MultiVantage Installation Manual page 60

Data modules and asynchronous data units
Pin Name Function
9 — Reserved for Testing
10 — Reserved for Testing
11 — Not used
12 CI Data Signal Rate Select (DCE Source)
13 CI2 Data Signal Rate Select 2 (DCE Source)
14 — Not used
15 DB* Transmitter Signal Element Timing (DCE
Source)
16 — Not used
17 DD* Receiver Signal Element Timing (DCE
Source)
18 LL Local Loopback
19 CH2 Data Signal Rate Select 2 (DTE Source)
20 CD (DTR) Data Terminal Equipment Ready
21 RL Remove Loopback
22 CE (RI) Ring Indicator
23 CH Data Signal Rate Select (DTE Source)
24 DA* Transmit Signal Element Timing (DTE
Source)
25 TM Test Mode
* Circuits are not used for asynchronous operation. Outputs are clamped OFF and inputs are ignored.
Configuring the 7400A for data communications
equipment (DCE) applications
If you are not going to use the 7400A data module in a modem pool, proceed as
follows.
60
Issue 4 October 2002
DCE DTE
+12 volts —
-12 volts —
— —
Output Input
— Input
— —
Output Input
— —
Output Input
Input Output
— Output
Input Output
Input Output
Output Input
Input Output
Input Output
Output Input
Continued on next page
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