3Com MSR 20, MSR 30, MSR 50 manual Interface attributes of MIM-2BSV/MIM-4BSV

136CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Step 3: Power on the router. Check the status of the LINK LED on the module panel. OFF means the link is in trouble and signal is out of synchronization. In this case, please check the link.

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 card 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.

■The BSV interfaces support two modes: user and network, respectively for connecting an ISDN network and a TE device.

■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.

■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.

■Working in conjunction with the FXS or FXO analog voice interface modules, MIM-2BSV/MIM-4BSV provides flexibility in voice call routing.

■The signaling on the ISDN BRI D channel is processed separately on CPU.

■The BSV interfaces support remote power supply and thus can be directly connected to ISDN phones.

■MIM-2BSV/MIM-4BSV is dedicated to voice applications, which is different from the BS interface cards where BRI data applications are supported.

Interface Attributes

Table 94 Interface attributes of MIM-2BSV/MIM-4BSV

Attribute	MIM-2BSV module	MIM-4BSV module
Connector	RJ45
Number of connectors	2	4
Interface standard	ITU-T I.430, Q.921, Q.931