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•
TEST—under test
•
DOWN—unavailable
To display the status for all modems, use the following command:
Command> show modems
Troubleshooting Digital Modems
The debug command is useful for troubleshooting the digital modems and Multichassis
PPP events on the PortMaster 4. Output is sent to the system console set by the
set console command. After completing the debugging process, disable the debug
commands by using the correct set debug off command, and reset the console with the
reset console command. Debug information is displayed to the console.
To set debug flags used for troubleshooting, use the following command—entered on
one line:
Command> set debug mdp-status|mdp-events on|off
Table 10-11 explains the debug options for the PortMaster 4
Table 10-11 Debug Options for the PortMaster 4
Option
mdp-status
mdp-events
Configuring Channelized T1 or E1
The PortMaster 4 supports channelized T1 service on the Quad T1 board and
channelized E1 service on the Tri E1 board.
Channelized T1 Service
Channelized T1 service provides 24 channels of 56Kbps capacity each. In contrast, an
ISDN PRI line provides 23 channels of 64Kbps capacity each—plus one 64Kbps signaling
channel. However, channelized T1 is available in many service areas that do not yet
provide ISDN PRI. In areas where PRI is available, the cost of channelized T1 can be
significantly less than the cost of PRI.
Each Quad T1 board on the PortMaster 4 has an integrated channel service unit/digital
service unit (CSU/DSU). However, the other end of a T1 connection might require an
external clock signal provided by the telephone company, or a CSU/DSU.
How to Order DS-1 Service from the Telephone Company
The telephone company will ask you the following two questions when you order
digital service level 1 (DS-1) service:
Configuring T1, E1, and ISDN PRI
Description
Set on to display the status of the digital modems.
Set on to display the progress of the digital modems as they
initialize.
Configuring Channelized T1 or E1
10-11
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Table of Contents
Troubleshooting
