HP MSR2000/3000/4000 Router Series Voice Command Reference

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Usage guidelines
Upon creation of a timeslot set on an E1/T1 interface, the system automatically creates a digital voice
interface numbered in the form of E1/T1 interface number:timeslot set number.
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 digital voice interface 1/0:15.
<Sysname> system-view
[Sysname] subscriber-line 1/0:15
[Sysname-subscriber-line1/0:15]
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. If the internal clock is not available,
this keyword specifies the crystal oscillator clock on the E1/T1 card as the clock source. The E1/T1
interface is the master in time synchronization. The SIC card does not have a crystal oscillator clock.
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: