Nortel Networks 2700 manual Appendix a Technical specifications 35 cable pinouts

98Appendix A Technical specifications

Table 32 V.35 cable pinouts (continued)

Standard-wired		Pair number	Special-wired
end 28-pin male	Signal name	and conductor	end 34-pin male	Notes
25	TM	pair 12A	NN
26	M0<-SIGNAL GROUND	pair 12B	B	Note 2
27	M1<-SIGNAL GROUND	pair 13A	B	Note 2
28	M2	pair 13B	no conn	Note 1
1	SHIELD	pair 14A	A	Notes 3,4
7	SIGNAL GROUND	pair 14B	B	Notes 2,4

The following notes apply to the single V.35 DTE cable:

1.The term “no conn” means the wire is not connected to a pin in the 34-pin connector.

2.Wires 12B, 13A, and 14B connect to pin B in the 34-pin connector.

3.At each end, the cable shield and connector shell must connect respectively to pin A of the 34-pin connector and pin 1 of the standard 28-pin connector.

4.Do not connect Shield to Signal Ground because these are separate signals.

Table 33 provides the X.21 cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted pair.)

Table 33 X.21 cable pinouts

Standard-wired		Pair number	Standard-wired
end 28-pin male	Signal name	and conductor	end 15-pin male	Notes
2	TXDA	pair 1A	2
14	TXDB	pair 1B	9
3	RXDA	pair 2A	4
16	RXDB	pair 2B	11
15	TXCA	pair 3A	6
12	TXCB	pair 3B	13
17	RXCA	pair 4A	pair 5A	Note 1
9	RXCB	pair 4B	pair 5B	Note 1
24	SCTEA	pair 5A	pair 4A	Note 1
11	SCTEB	pair 5B	pair 4B	Note 1
4	RTSA	pair 6A	3
19	RTSB	pair 6B	10

NN46110-311 02.01