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Interface Card and Interface Module Manual
H3C MSR 20/30/50 Series Routers
Chapter 2 Smart Interface Cards
2-49
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Figure 2-53
Straight-through ISDN S/T cable
When a BSV interface works in network mode, it uses a crossover ISDN S/T interface
cable for connection, with pins 3 and 6 for data transmission and pins 4 and 5 for data
receiving. At one end of the cable is an RJ-45 plug for connecting the
SIC-1BSV/SIC-2BSV interface and at the other end of the cable is an RJ-45 receptacle
for connecting a TE device.
Figure 2-54
Crossover ISDN S/T cable
2.14.5 Connecting the Interface Cable
Caution:
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If outdoor cabling is involved, you need to install a lightning arrester at the input end
of the ISDN BRI S/T interface cable to avoid lightning strike.
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When connecting the interface cable to the interface, pay attention to the mark on
the interface to avoid wrong insertion, which may damage the interface card or even
the router host.
Step 1: Decide the operating mode of the BSV interface. If the interface is to be
connected to an ISDN network, it should operate in user mode; if the interface is to be
connected to a TE device (a digital phone or another BSV interface in user mode for
example), the interface should operate in network mode.
Step 2: Connect the cable.