H3C Technologies H3C MSR 50 - Manual (Page 178)

3-74
Step3 Check the status of LINK LED on the MIM-1VT1 panel: OFF means the link is not connected. In the
latter case, check the line.
MIM-2BSV/MIM-4BSV Module
Introduction
MIM-2BSV (MIM-4BSV) is short for 2-port (4-port) ISDN BRI S/T voice interface module, which is
mainly used to process ISDN voice traffic. In the upstream direction, it can be connected to user
interfaces on an ISDN switch to receive and decompress, compress and transmit ISDN BRI digital voice
traffic. In the downstream direction, the module can be connected to TE devices to allow their voice
traffic to be forwarded through a WAN interface on the router to the Internet, thus implementing VoIP.
The interfaces on the MIM-2BSV/MIM-4BSV module are ITU-T I.430-compliant, adopting
pseudo-ternary coding, providing 192 Kbps rate, and allowing the maximum transmission distance of 1
km (0.6 mi.) in point-to-point mode. MIM-2BSV/MIM-4BSV has the following features.
z
The BSV interfaces support two modes: user and network, respectively for connecting an ISDN
network and a TE device.
z
When a BSV interface works in network mode, traffic is processed as follows: The digital voice
traffic received on the BSV interface is compressed and forwarded through the CPU on the main
control board to a WAN interface. The IP voice traffic received on a WAN interface is forwarded
through the CPU on the main control board to MIM-2BSV/MIM-4BSV, where the traffic is
decompressed and sent to the TE device.
z
When a BSV interface works in user mode, traffic is processed as follows: The digital voice traffic
received from the B channels on the BSV interface is decompressed and forwarded through the
CPU on the main control board to a local FXS or FXO analog voice interface. The voice signals
received on the local FXS or FXO analog voice interface are processed by VoIP and forwarded
through the CPU on the main control board to the MIM-2BSV/MIM-4BSV module, where the traffic
is compressed and sent out of the BSV interface to the connected ISDN switch.
z
Working in conjunction with the FXS or FXO analog voice interface modules,
MIM-2BSV/MIM-4BSV provides flexibility in voice call routing.
z
The signaling on the ISDN BRI D channel is processed separately on CPU.
z
The BSV interfaces support remote power supply and thus can be directly connected to ISDN
phones.
z
MIM-2BSV/MIM-4BSV is dedicated to voice applications, which is different from the BS interface
modules where BRI data applications are supported.
Interface attributes
Table 3-63 Interface attributes of MIM-2BSV/MIM-4BSV
Attribute MIM-2BSV module MIM-4BSV module
Connector RJ-45
Number of connectors 2 4
Interface standard ITU-T I.430, Q.921, Q.931
Interface rate 192 Kbps
Cable ISDN S interface cable
Supported service Voice access over ISDN S interface cable