
RS-232-C Modem Cable
Minimum Pin-Out
Modem end
25-pin male
Hub end
25-pin male
Signal
22Tx
33Rx
44RTS
55CTS
66DSR
77GND
8 8 CD OR DCD
20 20 DTR
22 22 RI
23 23 DRS – typically on V.24 (European) modems
Console Port Loopback Connector
The loopback connector shown below is useful for troubleshooting the console port on your
HP EtherTwist Hub/12, Hub Plus, and Hub Plus/48. This connector is included in the HP
Extended LAN Troubleshooting Kit, product number HP 28689B, or it can be purchased
separately. Contact your HP-authorized LAN dealer or your local HP sales office for
assistance.
HP part number 5062-3355.
The following pins are connected:
pin 2 to pin 3
pin 4 to pin 5 to pin 8
pin 6 to pin 20 to pin 22
pin 7 to pin 23
Cables and Connectors A-11
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