3com MSR 20-20 참조 매뉴얼

C

HAPTER

 175: E1 

AND

 T1 C

ONFIGURATION

 C

OMMANDS

Companding laws are adopted to quantize signals unevenly for the purpose of 
reducing noise and improving signal-to-noise ratio. Underpinning this approach 
are the statistics about voice signals, which indicate that lower power signals are 
more likely present than high power signals.

According to CCITT, when devices in two countries use different companding 
schemes to communicate, the side using µ-law is responsible for converting 
signals to A-law.

n

# Adopt µ-law companding for signal quantization.

<Sysname> system-view

[Sysname] voice-setup

[Sysname-voice] subscirber-line1/0:0

[Sysname-voice-line1/0:0] pcm u-law 

pri-set [ timeslot-list range ]

E1/T1 interface view

range: Specifies timeslots to be bound. Timeslots are numbered 1 through 31 on 
an E1 interface and 1 to 24 on a T1 interface. You may specify a single timeslot by 
specifying a number, a range of timeslots by specifying a range in the form of 
number1-number2, or several discrete timeslots by specifying number1, 
number2-number3. When the range argument is not specified, only TS15 is 
bound.

Use the pri-set command to bind timeslots on an E1 or T1 interface into a PRI set.

Use the undo pri-set command to remove the timeslot binding.

By default, no PRI set is created.

When creating a PRI set on a CE1/PRI interface, note the following:

■

TS0 is used for frame synchronization control (FSC), TS16 as a D channel for 
signaling transmission, and other timeslots as B channels for data transmission. 
You may bind the timeslots except for timeslot 0 into a PRI set (as the D 
channel, timeslot 16 is automatically bundled). This PRI set is logically 
equivalent to an ISDN PRI interface in the form of 30B + D. If no timeslot is 
specified, all timeslots except for TS0 are bound into an interface similar to an 
ISDN PRI interface in the form of 30B+D.

■

For the created PRI set, the system automatically creates a serial interface 
named serial number:15.