Nortel Networks 4500 Series - Manual (Page 38)

38 SFP specifications
The T1 equipment at the far end of the T1 connection must also use
an RJ-48C jack. After the pinout of the RJ-48C jack at the far end is
determined, determine if a straight-through or crossover cable is required.
An off-the-shelf straight-through cable can be used 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 8
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 8 "RJ-48C pinouts (opposite Tx and Rx connection)" (page
38) ), then a crossover cable must be used. The crossover connections
are as shown in the following table.
Table 9
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
6 Transmit shield 6 Receive shield
7 Not used 7 Not used
8 Not used 8 Not used
You can use a short crossover cable with a straight-through cable adapter
to connect to a straight-through cable. Do this to convert a straight-through
cable to a crossover cable.
Nortel Ethernet Routing Switch 4500 Series
Installation — SFPs and XFPs
NN47205-301 02.01
20 October 2008
Copyright © 2007-2008 Nortel Networks
.