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9-14 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Configuring E1 Cards
Configuring channel usage
Configuring channel usage
You must specify how each of the 32 channels of an E1 line is to be used. By default, E1
channels are configured as switched. Each of the 32 channels of an E1 line can be configured
for one of the following uses:
• Unused-Channel—Channel is unused. Send the single idle code defined for this channel.
• Switched-Channel—Switched channel, using either robbed-bit or D-channel signaling,
depending on how the line is configured at a higher level.
• Nailed-64-Channel—A clear-channel 64Kbps circuit. This configuration does not require
any setup information.
• D-Channel—Channel 16 (channel 17 in the TAOS unit interface) is used for ISDN
D-channel signaling directed at the appropriate controller for the physical interface.
To specify the channel usage:
1 List the Line-Interface parameters:
admin> list line-interface
2 Set the Channel-Usage parameter for the first channel:
admin> set channel 1 channel-usage=[unused-chan-
nel|switched-channel |nailed-64-channel|d-channel]
admin> write
Assigning telephone numbers to switched channels
Assigning telephone numbers to switched E1 channels is no different from assigning them to
switched T1 channels. See “Assigning telephone numbers to switched channels” on page 7-19.
Configuring trunk groups
Like nailed channels that have been assigned a group number, switched channels in a trunk
group can be referred to from a Connection profile and Call-Route profile to direct outbound
calls to use that specific bandwidth. Trunk groups also serve a variety of other purposes, such
as separating lines supplied by different carriers so those lines can be used as backup for each
other if one switch becomes unavailable. The decision to use trunk groups is a global one.
Once you have enabled the use of trunk groups, every switched channel must be assigned a
trunk group number or it will not be available for outbound calls.
Trunk groups limit the number of channels available to multichannel calls, because only
channels within the same trunk group can be aggregated.
To enable trunk groups, open the System profile and set Use-Trunk-Groups to Yes, as in the
following example:
admin> read system
SYSTEM read
admin> list
name = ""
system-rmt-mgmt = yes
use-trunk-groups = no