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Yellow Alarms
A yellow alarm occurs on a device when its signal is not received at the remote end. It
is also called a Remote Alarm Indication (RAI). You can disable detection and
generation of yellow alarms for a T1 port. When SF framing is used, yellow alarm
detection and generation should be set to off, because detection of yellow alarms is not
reliable when data traffic is transmitted with SF framing (data traffic often contains bit
combinations that do not occur for encoded voice traffic). The default value for yellow
alarm generation and detection is both. To configure yellow alarms, use the following
command:
config ports <portlist> t1 yellow [detection | generation | both | off]
T1 Port Configuration Commands
Table 2-1 describes the commands used to configure a T1 port.
Table 2-1: T1 Port Configuration Commands
Command
config ports <portlist> t1 alarms [on | off]
config ports <portlist> t1 cablelength [
[133 | 266 | 399 | 533 | 655] feet
| [0 | -7.5 | -15 | -22.5] dB]
config ports <portlist> t1 clock source [internal
| line]
config ports <portlist> t1 fdl [off | att | ansi]
config ports <portlist> t1 framing [esf | sf]
config ports <portlist> t1 lbdetect [off | inband]
config ports <portlist> t1 linecode [b8zs | ami]
config ports <portlist> t1 yellow [detection |
generation | both | off]
WM-4T1i Module Installation and User Guide
Description
Enables and disables alarms. The default
setting is on.
Specifies the cablelength attached to the T1
port. The default is 0 dB.
Specifies the clock source used for
transmission. The default setting is line.
Specifies the facilities data link (FDL) format for
the port. You cannot use FDL with SF framing.
Specifies the framing type. The default setting
is esf, Extended Super Frame (ESF). If sf is
chosen, Super Frame (SF), set yellow alarm
detection to off, since a yellow alarm can be
incorrectly detected with SF framing.
Enables and disables the port to respond to
loopback requests from the remote end. The
default setting is off.
Sets the linecoding. The default setting is b8zs.
Enable and disable yellow alarm detection and
generation.
Configuring T1 Physical link
2-5
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