Lantronix
ION x6010 User Guide
33493 Rev. F
Page 239 of 261
Red CFA
(Carrier Failure Alarm) – occurs after detection of a Continuous OOF condition for 2.5 seconds.
This alarm state is cleared when no OOF conditions occur for at least 1 second. Some applications (AT&T
DACS services) may not clear the CFA state for up to 15 seconds of no Out-Of-Frame occurrences.
Yellow CFA
(Carrier Failure Alarm) – when a Terminal/Network equipment enters a Red CFA state, it
transmits a “Yellow Alarm” in the opposite direction. A Yellow Alarm is transmitted by setting Bit #2 of
each timeslot to a 0 (zero), Space state for D4 Framed facilities. For ESF facilities, a Yellow Alarm is
transmitted by sending a repetitive 16-bit pattern consisting of 8 Marks (1) followed by 8 Spaces (0) in
the Datalink bits. This is transmitted for a minimum of 1 second.
For D4 facilities, the minimum Yellow Alarm detection time is 335 mSec. Trunk conditioning should
occur within 335 to 1000 mSec.
For ESF facilities, the minimum detection time is 28 mSec. (Note that 335 mSec equates to 2680 D4-type
frames.)
LOS
(Loss Of Signal) – a condition that is declared when no pulses have been detected in a 175 +/- 75
pulse window (100 to 250 bit times).
Recovery Procedures
1.
Ensure that the T1 or E1 is running properly on both ends.
2.
Use the
show
tdm config
,
show tdm loopback
, and
show tdm port
commands to verify that the
configuration of the line matches that of the remote end.
3.
Ensure that the cable between the interface port and the T1 or E1 service provider equipment or
remote E3 terminal equipment connects correctly.
4.
Ensure that the cable is connected to the correct port. Correct the cable connections as required.
5.
Check all cables integrity. Look for breaks or other physical abnormalities in the cable. Replace the
cable if necessary.
6.
Check x6010 DIP Switches and Jumper Settings (
page
211
).
7.
Run ION System Tests (
page
203
).
8.
Run the In-band Loopback Code Detect Procedure (
page
210
).
9.
Check with your provider to make sure the framing format configured on the port matches the
framing format on the line. Try another framing format and see if the alarm clears.
10.
Work with your provider to configure a remote loopback on the affected interface.
