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How to wire the pinouts of a T1 cable to connect a 2801 router with PBX

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To connect a Cisco 2801 router with PBX using a T1 connection, use a T1 cross-over cable.

There are T1 cross-over cable pinouts:

  • pin 1 to 4
  • pin 2 to 5
  • pin 4 to 1
  • pin 5 to 2

For more information, refer to the Digital Voice Port Pinout (RJ-48C) section of Cisco Digital 1-port and 2-port T1 Multi-Flex Voice WICs.

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