3Com MSR 50, MSR 30, MSR 20 manual Router installed with RTV-SIC-1E1/T1 module

VCPM Module 233

Step 3: Install the VCPM card on the mother board and fasten it with three screws. During installation, align the two connectors under the daughter board to the connectors on the main board to avoid damage to the connectors.

c CAUTION: You should align the three fastening holes on the VCPM card to the three fastening holes or metal standoffs on the mother board. Misplugging is prone to impair the interface module and even damage the router.

VCPM Card Application If a user wants to perform voice communication through data voice interface, Example besides using data voice interface board, he can also install a VCPM card on the

main board of an MSR 30 series router or in the VCPM slot on the MSCA card on an MSR 50 series router, with a certain number of VPM strips installed in the VPM slot as needed.

A router installed with RTV-SIC-1E1/T1 module

RTV-SIC-1E1/T1 module consumes VCPM and VPM resource when it is operating normally. Therefore, with RTV-SIC-1E1/T1 installed on a router, VCPM card and certain numbers of VPM should also be installed on the main board for MSCA board of the router.

n If there is an RTV-SIC-1E1/T1 module on the router but no VCPM or VPM card is installed, the router may operate abnormally.

A router installed with no RTV-SIC-1E1/T1 module

If there is no RTV-SIC-1E1/T1 module in the system, no VCPM and VPM are needed on a router. However, when a router is installed with voice E1/T1 module of other types and there is data exchange between voice E1/T1 modules, the main board of the router should be installed with VCPM card. VPM should be installed as needed.