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Configuring the PortMaster 3 11-7
Configuring ISDN PRI Settings
Setting the Pulse Code Modulation
You need to set the pulse code modulation only if you are using digital modems and
your PRI service provider instructs you to change the setting to something other than
the default. This command sets the digital encoding method used for analog signals.
To set the pulse code modulation, use the following command. Table 11-8 explains the
pulse code modulation options.
Command> set Line0 pcm u-law|a-law
Setting the Loopback
You can test the telephone line of your T1 or E1 ISDN connection by setting the local
network loopback.
To set the loopback, use the following command. Table 11-10 explains the loopback
options.
Command> set Line0 loopback on|off
Setting the Directory Number
Normally, a T1 or E1 line has a single telephone number. However, when the line is set
up as ISDN B channels, you can set a telephone number for an individual port. This
feature allows you to identify the circuit telephone number associated with a specific
ISDN port.
To set a telephone number for an individual port when the line is configured as ISDN
B channels, use the following command. Table 11-9 explains the directory number
options.
Command> set S0 directory Number
Table 11-8
Pulse Code Modulation Options
Option Description
Line0
Line0 or Line1.
u-law Default method for T1 PRI lines.
a-law Default method for E1 PRI lines.