Avaya S8700 Maintenance Manual page 1394

Maintenance-Object Repair Procedures
Aux Data 1 indicates that the facility is detecting a Remote Frame Alarm
(RFA), also known as the YELLOW alarm, being sent by the remote DS1
endpoint. This Yellow alarm corresponds to the yellow F2 state
documented in CCITT Recommendation I.431. If D4 framing is used,
received data will be corrupted in addition to transmitted data.
Aux Data 2 indicates that the facility is detecting a yellow F5 state alarm.
This error only applies to TN1654 DS1 CONV boards in 32-channel E1
operation with CRC enabled via the fiber-link form. The F5 fault state is
defined as a fault in the user-network interface, specifically in the direction
from the user (PBX) to the network. Refer to CCITT recommendation
I.431.
The far-end facility will be in LFA state. To isolate faults for this case, follow
the same repair procedure as in Error Type #1025 (loss of frame
alignment) for the other end of the DS1 facility.
h. Alarm Indication Signal (AIS), the BLUE alarm. This alarm indicates that
the far end of the facility is out of service. This means that the other end of
the DS1 facility is undergoing maintenance testing or has a LOS condition
and the CSU is providing a Keep Alive signal. If the Keep Alive signal is
not supplied by the CSU, a LOS condition will exist on the facility instead of
the AIS. If a LOS condition exists on the facility, the green LED on the
TN574 DS1 CONV circuit pack that is associated with the facility will be off;
if an AIS condition exists on the facility, the green LED that is associated
with the facility that has the AIS will be on. For TN1654 DS1 CONV
boards, the LED associated with the facility will be lit red if either the LOS
or AIS conditions exist.
To isolate faults for this case, follow the same repair procedure as in Error
Type #1793 (loss of signal) for the other end of this DS1 facility.
An RFA alarm indication (YELLOW alarm) is transmitted in response to this
BLUE alarm. If D4 framing is used, transmitted data is corrupted.
i. Loss of Signal (LOS) alarm. This alarm indicates that no signal is present
at the DS1 interface associated with the facility. On TN574 DS1 CONV
boards, the green LED that is associated with the facility will be off. For
TN1654 DS1 CONV boards, the LED that is associated with the facility will
be lit red. If the LED behavior differs, replace the DS1 CONV circuit pack.
Fault isolation for this problem may be different depending on the
capabilities of the CSU device that is being used. Typically, CSUs provides
an LED that is useful for fault isolation (see
This is the "16 Zeros" LED. This LED is momentarily lit when a string of 16
consecutive zeros is detected in the DS1 signal from the DS1 CONV.
Zeros on a DS1 link are represented by an absence of a pulse. Thus, an
active 16 Zeros LED indicates a LOS alarm from the DS1 CONV.
8-672 Issue 1 May 2002
Figure 8-26 on page 8-675).
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