Installation Guide

Method of Procedure
Operations and Maintenance
120 RFN_3.1 Beta
Indication Possible failure Corrective action
alarm from the far end.  Notify far end.
AIS LED is lit
(Alarm Indication Signal)
Far end equipment failure
 NOTE: The AIS LED is lit
when the All Ones Keep
Alive signal is received.
 Check for proper operation
of external site equipment.
 Notify far end.
FE/CRC LED is lit
(Framing Error/CRC Error)
T1 is no configured for ESF
 Configure T1 correctly.
Bit errors
 Check T1/E1 cabling.
 Check T1/E1 levels.
 Check for T1/E1 noise or
crosstalk.
Site controller failure
 Replace Site controller.
BPV/PD LED is lit T1 is not configured for
B8Zs
 Configure T1 correctly
Bit errors
 Check T1/E1 cabling.
 Check T1/E1 levels.
 Check for T1/E1 noise or
crosstalk.
Site controller failure
 Replace iSC-3.
Net LED is lit
(Network Loopback)
The Site controller has
received an in-band or out-
of-band loopback code, and
is in loopback mode.
 Notify far end.
Local LED is lit
(Local Loopback)
Front panel switch has put
the iSC-3 into loopback
mode.
 Push and hold the Sel/Loop
switch for 2 seconds. This
action takes the unit out of
loopback mode.
EAS Troubleshooting
Indication Possible failure Corrective action
EAS breaker on Cabinet
breaker is on, but POWER
LED (green) on EAS is not lit.
No power connected to
EAS.
 Check power source.
Cabling
 Check power cabling to EAS;
replace cable if necessary.
Wrong EAS response. Miswired modular cable
 Check EAS modular cabling.
AC fail alarm AC input, or an open or
disconnected alarm lead.
 Verify AC in put, check for
open and disconnected
alarm leads.
High temperature alarm AC input to air conditioner
 Verify AC input.
Site air conditioner
 Call for service on air
conditioner.