Inband Loopback Detection; Linecoding; Receiver Gain; Snmp Alerts - Extreme Networks WM-4T1i WAN Installation And User Manual

Configuring WAN Physical Links
config ports <portlist> e1 framing [crc4 | no-crc4]
The framing choices for T3 are C-bit and M13. To choose the T3 framing scheme, use
the following command:
config ports <portlist> t3 framing [c-bit | m13]

Inband Loopback Detection

When inband loopback detection is enabled, a specific sequence of data in the signal
payload from the remote end of the T1 link will cause the local end to enter network
line loopback mode and send any received signal back to the remote end. Inband
loopback detection is only possible if the FDL standard is configured as ATT. See
"Facility Data Link" on page 2-4 for more details. By default, inband loopback detection
is off. See "Loopback" on page 2-8 for more information about loopback modes. To
configure inband loopback detection, use the following command:
config ports <portlist> t1 lbdetect [off | inband]

Linecoding

Linecoding is the convention used to encode signals for transmission over the line.
For T1 connections you can choose from two linecoding standards, bipolar eight zero
suppression (B8ZS) or alternate mark inversion (AMI). The default value is B8ZS. To
configure linecoding, use the following command:
config ports <portlist> t1 linecoding [b8zs | ami]

Receiver Gain

The receiver gain for E1 links can be configured to improve performanance of the link.
Changing the receiver gain can help to receive the E1 signal or to reduce crosstalk.
Receiver gain is only configurable for E1 links. To configure receiver gain, use the
following command:
config ports <portlist> e1 receivergain [-12 | -43] db

SNMP Alerts

If the WAN module hardware detects a red, yellow, or blue alarm, the alarms are
displayed by using a show command. Additionally, the module can be configured to
WAN Module Installation and User Guide 2-5