R0106-HP MSR Router Series Voice Command Reference(V7)

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After you create a PRI group with the pri-set command on an E1/T1 interface, the system automatically
creates a voice interface numbered E1 interface-number:15 on an E1 interface and T1
interface-number:23 on a T1 interface.
Examples
# Enter the view of voice interface 2/4/1:15.
<Sysname> system-view
[Sysname] subscriber-line 2/4/1:15
[Sysname-subscriber-line2/4/1:15]
Related commands
• timeslot-set
• pri-set
tdm-clock
Use tdm-clock to configure a TDM clock source for an E1/T1 interface.
Use undo tdm-clock to restore the default.
Syntax
tdm-clock { internal | line [ primary ] }
undo tdm-clock
Default
The TDM clock source for an E1 or T1 interface is the internal TDM clock.
Views
E1 interface view, T1 interface view
Predefined user roles
network-admin
Parameters
internal: Specifies the internal clock of the device as the clock source. The E1/T1 interface is the master
in time synchronization.
line: Specifies the clock on the peer device as the clock source. The E1/T1 interface is a subordinate in
time synchronization.
line primary: Sets the T1/E1 interface to preferentially use the clock of the peer device as its clock source.
Usage guidelines
E1/T1 interfaces must ensure clock synchronization during TDM timeslot interchange to prevent frame
slips and bit errors.
When both E1 and T1 cards are present on a device, all the E1 or T1 SIC cards are a subsystem, and
each E1 or T1 HMIM card is a subsystem. Each subsystem determines the clock source according to the
following rules:
• If the line keyword is specified for all interfaces, the clock on the interface with the lowest number
is used. If the interface goes down, the clock on the interface with the second lowest number is used.
• If the line primary keywords are specified for one interface and the line or internal keyword is
specified for all other interfaces, the clock on that one interface is used.