R0106-HP MSR Router Series Voice Configuration Guide(V7)

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Configuring digital voice interfaces
Digital voice interfaces include E1, T1, and BSV interfaces.
E1 and T1 interfaces
E1 interfaces (also called VE1 interfaces) and T1 interfaces (also called VT1 interfaces) can connect to
the PSTN as trunk interfaces. An E1 interface provides 32 timeslots and 2.048 Mbps bandwidth. A T1
interface provides 24 timeslots and 1.544 Mbps bandwidth. ITU-T E1 is used mainly in Europe and
China. ANSI T1 is used mainly in America, Canada, and Japan.
E1/T1 voice transmission allows a router to provide more communication channels, which improves
router utilization.
Figure 14 sh
o
ws a typical network for E1/T1 interfaces.
Figure 14 Network diagram
BSV interfaces
BRI S/T voice (BSV) interfaces can compress, send, receive, and decompress voice packets. BSV
interfaces connect to PBXs as trunk interfaces. A BSV interface provides two B channels and one D
channel (2B+D) and supports only DSS1 signaling.
Configuration task list
To configure E1 and T1 interfaces, perform the following tasks:
Tasks at a glance
(Required.) Perform one of the following tasks:
• Configuring basic parameters for an E1 interface
{ Configuring a TDM clock source
{ Configuring other parameters
• Configuring basic parameters for a T1 interface
{ Configuring a TDM clock source
{ Configuring other parameters
(Required.) Configuring a timeslot set
• Creating a timeslot set
• Configuring a logical digital voice interface