X.21 Cable

[Sherif A. Louis]

Dear all,
We have an rp4440 server with a J3525A PSI card and connected through a X.21 Cable to a Cisco router. We currently have a failed cable and require the pin assignment of that cable. Can anyone provide it please? thank you

[Sherif A. Louis]

forgot to mention the cable's part number
J3525-60102

[Michael Steele_2 · Accepted solution]

Hi

J3535A is also an PCI card for a rp4440 that supports these cables configuration:

Serial RS-232 â ¢ V.35 â ¢ V.24 â ¢ X.21 â ¢ Serial RS-449 â ¢ V.11

X.21 ( occasionally written as X21 )is a specification for differential communications that that includes the definition of connector pin allocations. It is used together with V.11 to define a specification for serial synchronous communications at up to 10Mbps. A variant of X.21 called 'circuit switched X.21' is now no longer in use except for a few legacy systems.
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You want DB15 connectors
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Here are the Pin outs
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DB15 connector pinouts

Signal Name DB15 Contact Supported on FarSync cards
Shield 1 Yes
Transmit (A) 2 Yes
Control (A) 3 Yes
Receive (A) 4 Yes
Indication (A) 5 Yes
Signal Timing (A) 6 Yes
Byte Timing (A)
7


GND 8 Yes
Transmit (B) 9 Yes
Control (B) 10 Yes
Receive (B) 11 Yes
Indication (B) 12 Yes
Signal Timing (B) 13 Yes
Byte Timing (B)
14


Unassigned
15


http://www.farsite.co.uk/cable_standards/X.21_if_popup.shtml

[Sherif A. Louis]

thank you so much michael, this is what i needed. you are amazing :-)