Verilink APS 2000 T1 Line Protection (880-502411-001) Product Manual - Manual (Page 66)

Diagnostics
5-2 Verilink APS 2000 User Manual
CSU LEDs This section describes the function of the CSU’s LED (Light Emitting
Diode) indicators.
Figure 5-2 CSU LED states
LED State EQPT STAT NET
Green-solid Equipment is OK,
regardless of
network connection.
Not Used. A normal signal is
being received from
the network (all OK).
Green-flashing Not used. Thumbwheel switch
operator is accessing
the CSU at the node
controller.
Not used.
Amber-solid SCC is looped toward
the equipment (RLB
or ELB) and no errors
are being received.
CSU receiving APS
switch code.
SCC is looped toward
network via an LLB or
PLB and no errors are
received from the
network.
Amber-flashing Not used. CSU is applying a test
signal to the circuit.
Not used.
Red-solid Any continuous error
condition (for
example, LOS, LOF,
AIS).
Any alarm. Continuous errors on
the network (LOS,
LOF, RAI, AIS).
Red-flashing BPV or CRC-6 Error,
low density indicator.
Update speed: 50-
100 m/s.
Power-up self test
failure.
BPV or CRC-6 errors.
Green-Amber
alternating
Switched to
protection line.
Good signal is being
received, but CSU is
receiving the same
APS net code it is
sending (unless the
NET LED is flashing
green-amber also).
This could be from a
loopback, not
initializing the
system, or this
working line has
gone bad and
switched to the spare
line.
CSU receiving a
clean, spurious
signal (there are no
net codes in the
received signal).
Red-Amber
alternating
SCC is looped toward
the equipment (RLB,
ELB) and errors are
being received from
the equipment.
Errors received
during user-initiated
test.
CSU is looped toward
the network (LLB,
PLB) and errors are
being received (BPV
or CRC-6).
None illuminated SCC is not powered
up or has lost power.
Self test failure.
All OK. No power to SCC.
Self test failure.