H3C MSR Router Comware 5 Series Manual page 196

Figure 188 Connecting a service provider U interface cable to a BSV interface module
If the service provider provides an ISDN S/T interface cable, directly connect the service
provider cable to the BSV interface.
Figure 189 Connecting a service provider S/T interface cable to a BSV interface module
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When the BSV interface works in Network mode, you must use an ISDN S/T interface
crossover cable to connect the BSV interface to a TE device such as a digital telephone or a
BSV interface working in User mode:
Connect the RJ-45 connector (male) of the ISDN S/T interface crossover cable to the RJ-45
interface on the BSV interface module. Connect the RJ-45 interface (female) of the standard
ISDN S/T interface cable to one end of the standard ISDN S/T interface cable. Connect the S/T
interface on the TE device to the other end of the standard ISDN S/T interface cable.
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