C:\avayadoc\Aura CM5_2\CM5_2_avayadoc\CM52LEDDesc.pdf
ICSU Status LEDs Test (#1227)
This test runs only on TN767E or later DS1 circuit packs and TN464F or later
UDS1 circuit packs administered for 24-chel operation (1.544 Mbps).
The DS1 circuit pack has four status LEDs on the faceplate in addition to the
three standard faceplate LEDs. These four status LEDs are associated with the
120A Chel Service Unit (CSU) Module that can be connected to the DS1 board via
the I/O connector panel on the back of the port carrier.
This test is a visual test. It lights the four status LEDs red for 5 seconds,
green for 5 seconds, and yellow for 5 seconds. It then turns the LEDs off and re
turns control of the status LEDs to the circuit pack. The interpretation of the
LEDs are described in the DS1/UDS1 (TN767/TN464) section in the LED Descriptions
for Avaya Aura Communication Manager Hardware Components (03-602804)
DS1/UDS1 (TN767/TN464) Circuit Pack LEDs
The DS1 (TN767) and UDS1 (TN464) circuit packs have four status LEDs on the
faceplate in addition to the three standard faceplate LEDs. These four status
LEDs are associated with the 120A Channel Service Unit (CSU) Module which can be
connected to the TN767 or TN464 circuit pack through the I/O connector panel on
the back of the port carrier.
The TN464 circuit pack, combined with the 120A CSU module or the 401A T1 sync
splitter, forms an Integrated CSU (I-CSU).
TN767/TN464 LEDs shows the DS1/UDS1 circuit pack LEDs.
Test 1 Failure: Solid red on only this LED indicates faulty DS1 board.
Test 2 Failure: Flashing red on status 1 LED indicates either faulty DS1 board,
faulty wiring between the DS1 board and the 120A, or a faulty
120A.
Test 3 Failure: Flashing red on status 2 LED indicates faulty 120A.
Steady green on status 3 LED indicates all tests passed.
o <- Test 1 Failure
o
o
1 o <- Test 2 Failure
2 o <- Test 3 Failure
3 o <- Steady green on status 3 LED indicates all tests passed.
4 o
See Table 4: TN767/TN464 circuit pack LED interpretation for a guide to
interpreting LEDs on the TN767 and TN464 circuit packs. In the table, DS1 refers
to both DS1 and UDS1.
Note: On the TN767/TN464 circuit pack faceplate, loopback indications share the
same LEDs as alarm indications. Loopback indications take priority over
alarm indications. Disregard alarm indications while loopback indications
are active. For example, if the status 2 LED is yellow, indicating a
loopback problem, disregard status 3 and status 4 alarm indications.
Table 4: TN767/TN464 circuit pack LED interpretation 1 of 3
LED Color Condition Notes
Solid red Red Faulty DS1
only on top circuit pack
circuit-pack
LED
STATUS 1 Green Far end line A near end DS1 circuit-pack
loopback (LLB) initiated line loopback is
active active at the far end CSU.
Yellow Bit error rate Error rate from the network
(BER) alarm exceeds 10000
active
Solid red Loss of signal If the DS1 circuit-pack fails to
(LOS) from DS1 send a signal to the CSU module,
circuit-pack the top LED on the circuit-pack
will turn on red
Steady Failed equip. Flash rate is .5 seconds on and
flashing red loopback (ELB) off. This could indicate either
test a bad DS1 circuit-pack where the
problem is between the pack
loopback and the edge of the
pack, bad wiring or bad CSU
module.
Off Normal operation
Status 2 Green CSU repeater lb
(RLB) or ELB
active
Yellow Near end CSU mod
LLB or PLB active
Solid or Span alarm
randomly indicated by
flashing red Status 3 or 4
is active
Flashing red Failed RLB Flash rate is .5 seconds on and
test off. Replace the 120A CSU
Off Normal
operation
Status 3 Green Pulses present If this LED is off, the Status 4
LED will be red, indicating LFA
or LOS from the span. Either
Status 3 or 4 will always be on
if a 120A is present. Pulses
from the span might be
intermittent. In this case, the
LED might go off for several
seconds, then turn back on.
During the time it is off, other
status LEDs will indicate alarms
Yellow Bipolar This LED flashes each time a BPV
violation (BPV) is received from the network.
received from B8ZS BPVs are not reported.
the span
Red CRC or frame This LED flashes each time a CRC
bit error from or bit error received from the
the span network.
Off No pulses Triggers the Status 4 red LED
Status 4 Green Alarm Blue alarm, indicating equipment
indication is down on the far end.
signal (AIS) is
received from
the span
Yellow Remote frame This indicates that the far end
(RFA) received cannot frame on the DS1 circuit-
from the span pack's signal.
Red Loss of frame
alignment (LFA)
from the span
Off Normal operation
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Alarm Description
Cyclic May be produced by marginal or faulty line repeaters, network
Redundancy circuit terminating equipment (NCTE), noise on the transmission
Check (CRC) line, or by the circuitry that generates the framing pattern or
Erors CRC at the transmit end. Bit errors in a DS1's signal are
detected via CRC errors when Extended Super Frame (ESF) is used.
Loss of Frame Occurs when the near-end interface cannot frame up on the DS1's
(LOF) Alarm, signal. A red LED lights on D4 channel banks when this alarm is
Red Alarm on. A frequent cause is an incorrect setting of the framing
option at one end of the transmission facility or within the
network. This scenario will cause the LFA at both ends of the
transmission link. Other possible causes are an intermittent
cable, broken cable, and a rain-attenuated signal (with
microwave transmission facilities).
This alarm is tripped several seconds after detecting a
continuous loss of framing, and clears several seconds after
restoring the in-frame condition. The end of the span with the
LFA sends an RFA to the other end to indicate it cannot frame
on the other's signal.
Remote Frame When received at the near end, shows that the far end is unable
Alarm (RFA) to frame up on the signal sent by the near end. The far-end
Yellow Alarm interface is in an LFA state. A yellow LED lights on D4 channel
banks. Something is wrong with the part of the transmission
facility that transmits the DS1's signal from the near end to
the far end. May be caused by a broken conductor
in the transmission cable wiring or within the network.
Loss of Signal Shows that there is no bipolar signal present at the receiver
(LOS) Alarm input. Occurs in parallel with the LFA alarm. Usually caused by
cable-related problems such as a broken pair inside a cable, an
intermittent cable at a cross-connect point, or a cable
connector not completely seated.
AIS, Shows that maintenance activities are in progress and that the
Blue Alarm out-of-service condition exists for that DS1 facility. The alarm
is recognized as a continuous stream of 1s with no framing bit.
This alarm condition may be treated differently depending on the
particular network circuit terminating equipment (NCTE) used.
It may result in the NCTE automatically looping the signal back
to the switch. If the looped facility is providing
synchronization, then the synchronization subsystem must detect
that the facility is looped and deal with that condition.
Otherwise, synchronization problems will occur.