1-16
MAX Administration Guide
Administering MAX Hardware
Using modems to perform administrative tasks
o: 0 0 0 0 0 0 0
wanidle0 i: 0 0 0 0 0 0 0
o: 0 0 0 0 0 0 0
lo0 i: 0 0 0 0 0 0 0
o: 0 0 0 0 0 0 0
Table 1-9 describes the output of the Show If command.
Using modems to perform administrative tasks
In order to isolate performance issues related to modems, you can disable specified digital
modems and modem slots. A digital modem is an internal device in a MAX unit that enables it
to communicate over a digital line with a station connected to an analog line. Incoming modem
calls and incoming digital calls come over the same digital line. The MAX unit can accept an
incoming call from the network either as a pure digital stream or as a digital stream encoded by
Pulse Coded Modulation (PCM). A PCM-encoded digital stream contains a digitized version
of the analog waveform sent by a device attached to a modem. The MAX unit can also convert
outgoing data into analog waveforms, convert these waveforms to a PCM-encoded digital
stream, and send them to the network over a digital line. The network presents the data to the
receiving modem in analog form over an analog line. The data looks exactly as it would appear
if it had been sent by an analog-based modem.
Quiescing or disabling a modem or modem slot does not result in active calls being torn down.
Instead, when the active call discontinues, that modem or modem slot is added to a disabled list
and is unavailable for use. If all modems or modems slots are disabled, incoming callers
receive a busy signal until the modems have been restored for service. A quiesced modem or
modem slot is available for use approximately 20 seconds after it has been re-enabled.
Table 1-9. Show If command output
Field
Description
Name
Interface name. For more information, see the Network Configura-
tion Guide for your MAX unit.
Octets
Total number of bytes processed by the interface.
Ucast
Packets with a unicast destination address.
NonUcast
Packets with a multicast address or a broadcast address.
Discard
Number of packets that the interface could not process.
Error
Number of packets with CRC errors, header errors, or collisions.
Unknown
Number of packets the MAX forwarded across all bridged interfaces
because of unknown or unlearned destinations.
Same IF
Number of bridged packets whose destination is the same as the
source.