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B-12
MAX Administration Guide
Diagnostic Parameters and Commands
Using diagnostics-related VT100 commands
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Dis Modem+Chan—An arbitrary B channel is taken out of service along with the disabled
modem. The B channel appears on a disabled-channel map, and the MAX polls all
channels on the map with Out-Of-Service messages until the associated modem is
reenabled.
To quiesce a digital modem:
1
Open the Mod Config submenu from the Modem profile and select the modem (Modem
#N) you want to disable. (The modem ports on a slot card are numbered starting with #1
for the leftmost port on the card.)
2
Press Enter to select
dismodem
and disable (quiesce) the modem. Or, press Enter again
to select
dis modem+chan
and to disable the modem and the channel.
For example,
V.90 K56 II Modem
Mod Config
ModemSlot=enable slot
Modem #1=dis modem
Using T1-related commands
The MAX provides the following T1 line diagnostic commands, which appear in the Net/T1 >
Line Diag menu:
Net/T1
Line Diag
Line LB1
Line LB2
Switch D Chan
Clr Err1
Clr Perf1
Clr Err2
Clr Perf2
To execute one of the commands, select the command and press Enter.
Line LB1
Line LB1 is a Line LoopBack command for Line 1 in a T1 slot. When you start the line
loopback test for a T1 line, a remote device can test the T1 line and the MAX unit’s interface to
the T1 line. All signals received by the MAX are looped back (behind the MAX unit’s CSU
repeater or DSX signal-conditioning module) toward the remote device. The remote device
can determine the quality of the T1 line by comparing the sent signal to the received signal.
Line LoopBack (LLB) occurs behind the MAX unit’s CSU repeater or DSX
signal-conditioning module. Drop-and-Insert channels are also looped back. Do not activate
LLB when a call is active on the line; doing so disrupts the data flow between the codecs
connected to either end of the network line. The MAX responds to both the inband LLB signal
and the Facility Data Link (FDL) LLB message. Therefore, a management device can put the
MAX into LLB. A management device is a unit, on a T1 line, that measures the line’s
performance and can send management signals to other devices on the line.