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ARC Cable Reference
ARC Cable X.21 Attachement to DCE
Figure
3-56. X.21 Cable: ARC to DCE
Interchange Circuits
ARC
X.21
Connector
Connector
P1
P2
┌─────┐
┌─────┐
│ 6 o─┼─8───────────────────┼─o
2│
Transmit (A)
│15 o─┼─8───────────────────┼─o
9│
Transmit (B)
│ 7 o─┼───8─────────────────┼─o 13│
Signal Timing (B)
│24 o─┼───8─────────────────┼─o
6│
Signal Timing (A)
│ 8 o─┼─────8───────────────┼─o
7│
Txmit Clk (A)/Txmit Clk Wrap (A)
│26 o─┼─────8───────────────┼─o 14│
Txmit Clk (B)/Txmit Clk Wrap (B)
│ 9 o─┼───────8─────────────┼─o 1ð│
Control (B)
│18 o─┼───────8─────────────┼─o
3│
Control (A)
│12 o─┼─────────8───────────┼─o
4│
Receive (A)
│2ð o─┼─────────8───────────┼─o 11│
Receive (B)
│1ð o─┼──┐
│ o
│
│16 o─┼──┼──────────────────┼─o
8│
Ground
│22 o─┼──┤
│ o
│
│23 o─┼──┘
│ o
│
│17 o─┼─────────────8───────┼─o 12│
Indication (B)
│25 o─┼─────────────8───────┼─o
5│
Indication (A)
└─────┘
└─────┘
Legend: ─8─
A twisted pair
─8─
Figure
3-57. X.21 Cable: ARC to DCE Pin Assignment
Chapter 3.
External Cables for 3746 Models 900 and 950
3-35
Summary of Contents for Nways 3746-900
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