CS Context Overview
179
Software Configuration Guide, Revision 1.03
SN(sys)#clock-source 1 0
SN(sys)#synchronize-to-isdn-time
In most cases the default value is suitable, so that you do not need to perform this configuration
tasks.
•
Configure clock source:
The packaging of the ISDN voice frames needs a reference clock. It is possible to generate
this reference clock internally or get it from an external device (e.g. public ISDN). If you have
a connection to a public ISDN this is the normal case.
•
Select PCM law :
The PCM law-select specifies the voice characteristic compression curve. Two values are
possible: "a-Law" and "µ-Law". "a-Law" is used in Europe, and "µ-Law" in USA.
•
Set PCM code:
The PCM code specifies which segmentation of the time slot is used. Two values are
possible: "E1" and "T1". "E1" is used in Europe, and "T1" in USA. T1 interfaces will be
supported in future releases.
•
Synchronize to ISDN time:
The internal time of the Smartnode can be synchronized to the time on the public ISDN.
•
Set bypass mode
The Smartnode contains a hardware bypass, which connects two ISDN ports in case of
power failure. You can manually enable it on a running system.
Procedure
To set the general CS parameters
Mode
system
Command
Purpose
Step 1
node
(sys)#no bypass-mode
Turn off the hardare bypass.
Step 2
node
(sys)#clock-source internal
or
node
(sys)#clock-source
slot-number
port-number
Generate the reference clock internally
or
specify a specific port to receive the reference
clock.
Step 3
node
(sys)#synchronize-to-isdn-
time
Enable SmartWare to get the actual system time
from public ISDN.
Step 4
node
(sys)#ic voice
slot-number
Change to mode ic_voice.
Step 5
node
(ic-voice)[
slot-number
]#pcm
code E1
Set the PCM code for Europe
Step 6
node
(ic-voice)[
slot-number
]#pcm
law-select aLaw
Select the PCM law for Europe
Configure General CS settings
The following example configures the general CS parameters
SN>enable
SN#configure
SN(cfg)#system
SN(sys)#no bypass-mode