T1/E1/Pri Card Leds - NEC DSX-160 Hardware Manual

T1/E1/PRI Card LEDs

(Yellow)
Port Activity
Off: All ports on PCB idle.
Flash: Port(s) busy. The faster the flash, the more
ports are busy.
(Green)
Sync (Master)
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.
(Green)
Loop (Slave)
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
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
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
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).
DSX-80/160 Hardware Manual
(Red)
(Red)
(Red)
Telco
U pstream from T1 PCB
D ownstream from T1 PCB
Figure 36: T1/E1/PRI Card LEDs
Powering Up the System
(Green)
PCB Running
Slow flash: T1 PCB running.
On: T1 PCB starting.
Yellow (RAI or Remote Alarm Indication) Alarm
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).
CSU T1 PCB
(Red)
Installation ◆ 51