Datasheet

Pin Description
3 Receive shield
4 Transmit ring
5 Transmit tip
6 Transmit shield
7 Not used
8 Not used
The T1 equipment at the far end of the T1 connection must also use an RJ-48C jack. After you
determine the pinout of the RJ-48C jack at the far end, determine if you need a straight-
through or crossover cable. You can use an off-the-shelf straight-through cable to directly
connect the T1 SFP module and the far-end T1 equipment if the far end has the pinout shown in
the following table.
Table 5: RJ-48C pinouts (opposite Tx and Rx connection)
Pin Description
1 Transmit (Tx) ring
2 Transmit tip
3 Transmit shield
4 Receive (Rx) ring
5 Receive tip
6 Receive shield
7 Not used
8 Not used
If the far end connection does not match the connections shown in this table (Table 5: RJ-48C
pinouts (opposite Tx and Rx connection) on page 31), then you must use a crossover cable.
The following table shows the crossover connections.
Table 6: RJ-48C crossover cable connections
Terminal A Terminal B
Pin Description Pin Description
1 Receive ring 1 Transmit ring
2 Receive tip 2 Transmit tip
3 Receive shield 3 Transmit shield
4 Transmit ring 4 Receive ring
5 Transmit tip 5 Receive tip
T1 SFP specifications
Installation — SFPs and XFPs December 2010 31