Specifications

Installing PCBs
DS2000 Hardware Manual Section 2: PCB Installation ◆ 2-11
2
T1 PCB Leds
Figure 2-15: T1 PCB 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 PCBCSUTelco
U p s t r ea m from T1 PCB
D own s t r ea m from T1 PCB