User's Manual Part 1

BTS Equipment Identification – continued
PRELIMINARY
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
MAY 2004
1-26
HSO and MSO
The High Stability and Medium Stability Oscillator module provide a
backup reference source should the Global Positioning System (GPS)
fail. The HSO is capable of providing up to 24 hours and the MSO is
capable of providing up to 8 hours.
Only one of either the HSO or MSO is available in the Compact BTS.
The module is located in front, behind a cover, underneath the CCP2
Shelf. The unit slides into the top slot of the two that are present.
Modem
The slot underneath the HSO/MSO slot is reserved for a Modem
module, however it is not supported for the SC480.
BTS Rear Panel
LAN connectors, RF Connectors, circuit breaker, DC Power connection,
RF GPS, and SDCX are found at the rear of the BTS.
CBIO Board
Figure 1-7 shows the RF GPS, SDC, TME, PDE, cPA, Customer I/O
connectors, and Status indicators.
RF GPS
The optional Radio Frequency Global Positioning System (RF–GPS) is
contained in a module that plugs in to the CBIO board at the rear of the
BTS. It can be used in place of the RGPS. See Figure 1-7.
SDCX
The Synchronization Daisy–Chaining and eXpansion (SDCX) module is
only used when there are expansion BTSs at the site. It supports timing
distribution for up to three expansion frames, and also supports
synchronization daisy–chaining feature. See Figure 1-7.
LAN Connectors
LAN input and out put connectors for 10BaseT connection are found at
the upper right rear of the BTS. See Figure 1-7. There are LAN output
connectors on the front panel below the CCP2 Shelf. See Figure 1-4.
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