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Appendix E: Cables X.21 WAN Cable - Page 137
X.21 WAN Cable
A
B
C D
E
A 37 Way D-Type Plug with UNC 4-40 locking screws.
B 15 Way D-Type Plug with M3 locking screws.
C Label
D 6 twisted pair screened cable - each core is 7/0.203mm (24 AWG) tinned
copper stranded wire, nominal capacitance of 98pF/m, impedance of 77 Ω at
1MHz, screened with aluminized tape and a tinned copper wire drain.
E 3 meters.
Pin Connections
End A Name Cable Notes End B
1 Receive (Rx-B) 11
20 Receive (Rx-A)
Twisted Pair
4
4 Transmit (Tx-A) 2
23 Transmit (Tx-B)
Twisted Pair
9
24 Control (Ctl-A) 3
5 Control (Ctl-B)
Twisted Pair
10
2 Indicate (Ind-A) 5
21 Indicate (Ind-B)
Twisted Pair
12
3 SE-Timing (S-A) 6
22 SE-Timing (S-B)
Twisted Pair
13
6 Ground ------ 8
Connect pin 7 to pin 6 at End A only.
Pin 19 at end A is connected to the Screened Cable Drain Wire.
INDeX IPNC Cassette Administration Manual Appendix E: Cables - Page 137
38DHB0002UKDD – Issue 7 (22/11/02) X.21 WAN Cable