Manual

S SI (Site Span I/O) Module Chapter 6: S SI R eplacement Procedures
S SI removal requires powering off the S SI and disconnecting all of its cables. Operation of
the following will be interrupted:
• E -GPS or RGPS whichever is applicable.
• QHSO
• ALARM/CONTROL for the optional PSM shelf
• LMF
• Customer alarm input/output devices
• IP -packet backhaul
The DMI controller will switchover to the DMI MSO as a backup reference source.
Call traffic processing through the site will be interrupted by the S SI replacement procedure.
Alarms will be reported.
Table 6 -1 S SI R eplacement Conditions
FRU
Ref Designator What to Shutdown...
Site Span I/O
Module
S SI
Shutdown site signaling functions and DC
operating power to the S SI.
SSI LEDs
The following bi -color LED indicators are located on the S SI front panel by the DMI and RJ -45
connectors (see ):
• ALARM
• INST ANCE
• ST A TUS
T able 6 -2 shows the possible states for the S SI front panel LEDs and the corresponding
indication.
Table 6 -2 S SI LEDs States and Indications
ALARM LED State INST ANCE LED State ST A TUS LED State
Indication
Off Off Off
No DC P ower to FRU
On Orange On
LED Indicator T est (temporary; 0.5 sec
to 1 sec)
On
N/A
Off FRU F ailure
Off
N/A N/A
No FRU F ailure
Continued
6 -4 68P09283A64 -3
FOA SEP 2007