Chapter 3: Connecting to the Line

V.11 Interface

The following specifications describe the V.11 interface:

•Electrical specification: CCITT V.11, CCITT X.27, TIA/EIA RS-422(0-5V differential)

•Signaling specification: CCITT X.21

•Maximum data rate: 2 Mbps (card limitation)

•Maximum cable length: 150 feet (at 2 Mbps)•Standard DCE connector: ISO 4903 (DB15)

The following table and illustrations describe the V.11 signals on the connector..

Pin #

Tw. Pair

Name (CCITT #)

Signal

Direction

 

 

 

 

 

2

I

T(A) (103A)

Transmit Data

Out

 

 

 

 

 

14

I

T(B) (103B)

Transmit Data

Out

 

 

 

 

 

3

II

R(A) (104A)

Receive Data

In

 

 

 

 

 

16

II

R(B) (104B)

Receive Data

In

 

 

 

 

 

24

III

X(A) (113A)

Transmit Clock

Out

 

 

 

 

 

11

III

X(B) (113B)

Transmit Clock

Out

 

 

 

 

 

17

IV

S(A) (115A)

Receive Clock

In

 

 

 

 

 

9

IV

S(B) (115B)

Receive Clock

In

 

 

 

 

 

4

V

C(A) (105A)

Command

Out

 

 

 

 

 

19

V

C(B) (105B)

Command

Out

 

 

 

 

 

5

VI

I(A) (109A)

Indication

In

 

 

 

 

 

13

VI

I(B) (109B)

Indication

In

 

 

 

 

 

18

-

-ENV11

V.11 Interface enable

In

 

 

 

 

 

iSPAN Serial WAN Adapter Users Guide

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