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Chapter 3
Installing Printed Circuit Cards
TEPRI LED DEFINITIONS
LED Name
Function
Status
Normal Status
Error Status
SYN
Synchronization Loss. Indicates wander or loss of
framing.
OFF
ON
LOS
Loss of Signal. No PCM Clocking is being received.
OFF
ON
AIS
Alarm Indicating Signal. Indicating that all one’s
are being received.
OFF
ON
L2
Layer 2 is active. PRI messaging is being received.
ON
OFF
IPC
IPC link set up.
OFF / IPC link set up
CLK
Card clock status.
OFF/CARD is secondary source
ON card is primary source.
LED’s TP1 & TP2 show the span type
TP1
TP2
E1 mode
OFF
OFF
E1 PRI mode
OFF
ON
T1 mode
ON
OFF
MODE
T1 PRI mode
ON
ON
Figure 3-18
TEPRI Card
