Powering Up the System
DSX-80/160 Hardware Manual
Installation
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51
Installation
T1/E1/PRI Card LEDs
Figure 36: T1/E1/PRI Card LEDs
PCB Running
(Green)
Slow flash: T1 PCB running.
On: T1
PCB
starting.
Port Activity
(Yellow)
Off: All
ports
on
PCB
idle.
Flash:
Port(s) busy. The faster the flash, the more
ports are busy.
Sync (Master)
(Green)
Off:
T1 PCB is in the slave mode (i.e., getting the
clock from the connected T1 circuit).
On: T1
PCB
is
providing the master clock to the
telco and is in sync.
Flash:
T1 PCB
is
providing the master clock but is
not in sync.
Loop (Slave)
(Green)
Off:
T1 PCB is in the master mode (i.e., providing
the clock to the connected T1 circuit).
On: T1
PCB
is
in sync with the external clock
source (and
is not
providing the master clock).
Flash:
T1 PCB
is not
in sync with the external clock
source (and
is not
providing the master clock).
LOS (Loss of Signal) or Red Alarm
(Red)
Off:
Signal from the connected telco T1 Circuit
is
present.
On:
Signal from the connected telco T1 circuit
is
not
present.
An
LOS
alarm means there is a problem
upstream
from the T1 PCB.
BPV (Bi-Polar Violation) Alarm
(Red)
This alarm indicates that consecutive “one” pulses
have been received in the T1 signal in error.
Off: The
telco’s
T1
signal
does not contain
Bi-Polar Violations.
On:
The telco’s T1 signal is in error. It
contains
Bi-Polar Violations.
A
BPV
alarm means there is a problem
upstream
from
the T1 PCB.
AIS (Alarm Indication Signal) or Blue Alarm
(Red)
The telco sends an AIS alarm signal to the T1 PCB if
the telco receives faulty data from another device on
its network (i.e., upstream). It sends the AIS alarm sig-
nal to the PCB instead of the faulty data it received.
Off: AIS
signal
not received
from telco.
On: AIS
received
from telco.
An
AIS
alarm means there is a problem
upstream
from the telco (and upstream from the T1 PCB).
Yellow (RAI or Remote Alarm Indication) Alarm
(Red)
The telco sends an RAI alarm to the T1 PCB if it
detects a problem with the T1 signal received from the
installation site. The problem can come from the T1
PCB, the CSU (if any), or be caused by faulty cabling.
Off: RAI
signal
not received
from telco.
On: RAI
received
from telco.
An
RAI
alarm means there is a problem
downstream
from the telco (i.e., in the T1 PCB, CSU, or cabling).
T1 PCB
CSU
Telco
U
pstream
from T1 PCB
D
ownstream
from T1 PCB
