Data modules and asynchronous data units

Pin

Name

Function

DCE

DTE

9

Reserved for Testing

+12 volts

 

 

 

 

 

10

Reserved for Testing

-12 volts

 

 

 

 

 

11

Not used

 

 

 

 

 

12

CI

Data Signal Rate Select (DCE Source)

Output

Input

 

 

 

 

 

13

CI2

Data Signal Rate Select 2 (DCE Source)

Input

 

 

 

 

 

14

Not used

 

 

 

 

 

15

DB*

Transmitter Signal Element Timing (DCE

Output

Input

 

 

Source)

 

 

 

 

 

 

 

16

Not used

 

 

 

 

 

17

DD*

Receiver Signal Element Timing (DCE

Output

Input

 

 

Source)

 

 

 

 

 

 

 

18

LL

Local Loopback

Input

Output

 

 

 

 

 

19

CH2

Data Signal Rate Select 2 (DTE Source)

Output

 

 

 

 

 

20

CD (DTR)

Data Terminal Equipment Ready

Input

Output

 

 

 

 

 

21

RL

Remove Loopback

Input

Output

 

 

 

 

 

22

CE (RI)

Ring Indicator

Output

Input

 

 

 

 

 

23

CH

Data Signal Rate Select (DTE Source)

Input

Output

 

 

 

 

 

24

DA*

Transmit Signal Element Timing (DTE

Input

Output

 

 

Source)

 

 

 

 

 

 

 

25

TM

Test Mode

Output

Input

Continued on next page

* 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

555-233-116

Page 60
Image 60
Avaya 555-233-116 manual CI2, Data Signal Rate Select 2 DCE Source Input