Specifications

Link Interfaces Reference
22
V.35 Link Pinouts
The connector shown here and pinouts described here correspond to
the connector labeled “V.35” on the back of the router.
13
1
25
14
DB25 Female DTE
DB25
Contact
Number
M.34
Contact
Number
Circuit
Name
Direction
To From
DCE DCE
1 A Protective Ground NA
2 P Transmitted Data (A) X
3 R Received Data (A) X
4 C Request to Send X
5 D Clear to Send X
6 E Data Set Ready X
7 B Signal Ground NA
8 F Data Channel Received Line Signal Detector X
9 X Receiver Signal Element Timing (B) X
10 ----------
11 W Terminal Signal Element Timing (B) DTE X
12 AA Send Signal Element Timing (B) X
13 ----------
14 S Transmit Data (B) X
15 Y Send Signal Element Timing (A) X
16 T Received Data (B) X
17 V Receiver Signal Element Timing (A) X
18 L Local Loopback X
19 ----------
20 H Data Terminal Ready X
21 N Remote Loopback X
22 ----------
23 ----------
24 U Terminal Signal Element Timing (A) DTE X
25 NN Test Mode X
Figure 2 - 4 V.35 Link Pin Outs
The connecting cable must be a shielded cable.
Circuits which are paired (contain an (A) and (B) reference) should be connected to twisted pairs within the
connecting cable.
NOTE For U.K. Approval:
The connecting cable should be manufactured from Belden Cable, or a cable with equivalent specifications. One end must be
terminated in a male 34 pin X.21 bis connector as defined in ISO-2593 1984. The other end must be terminated in a male 25
pin X.21 bis connector as defined in ISO-2110 1989. The cable may be any length between 0 and 5M.