Nortel 1700, Installing Manual

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Appendix A Technical specifications 77
Installing the Contivity 1700
T1/E1 CSU/DSU WAN interface card
The T1/E1 CSU/DSU WAN interface card has a single connector that provides the
signals needed to interface to T1 or E1 equipment.
Figure 32 shows the T1/E1
CSU/DSU WAN interface card. This interface card ships as a half-height card and
as a full-height card.
Figure 32 T1/E1 CSU/DSU WAN interface card
The connector on the T1/E1 CSU/DSU WAN interface accommodates an 8-pin
RJ-48 modular patch cord. These cables are commonly sold as Category 5, or
Ethernet, cables.
The cable you use should be wired in accordance with EIA-568-A wiring style.
This wiring style ensures that the transmit signal (pins 4 and 5) and the receive
signal (pins 1 and 2) are carried on a twisted pair inside the patch cord. The use of
factory-made patch cords is strongly recommended.
You connect the T1/E1 CSU/DSU WAN interface card to the service provider
network using a straight-through cable or a crossover cable, depending on how the
service provider wired its jack.
• For a straight-through connection, you can use a standard Category 5
(Ethernet) straight-through cable.
• For a crossover connection, you cannot use a standard Category 5 crossover
cable. The T1/E1 CSU/DSU crossover cable and the Ethernet crossover cable
are not interchangeable.
Note: For E1 service, you must install the half-height version of the
T1/E1 CSU/DSU WAN interface card.
Note: Nortel Networks does not supply the T1/E1 CSU/DSU WAN
interface cable with the WAN interface card.
CS160012A