User's Manual

Download the BTS
68P09255A61-4
Aug 2002
1X SC 4812T BTS Optimization/ATP Software Release 2.16.1.x
FIELD TRIAL
3-28
Select CSM Clock Source
A CSM can have three different clock sources. The Clock Source
function can be used to select the clock source for each of the three
inputs. This function is only used if the clock source for a CSM needs to
be changed. The Clock Source function provides the following clock
source options:
 Local GPS
 Mate GPS
 Remote GPS
 HSO (only for sources 2 & 3)
 HSO Extender
 HSOX (only for sources 2 & 3)
 LFR (only for sources 2 & 3)
 10 MHz (only for sources 2 & 3)
 NONE (only for sources 2 & 3)
Prerequisites
MGLI=INS_ACT
CSM= OOS_RAM or INS_ACT
Follow the procedure in Table 3-14 to select a CSM Clock Source.
Table 3-14: Select CSM Clock Source
Step Action
1 Select the applicable CSM(s).
2 Click on the Device menu.
3 Click on the CSM/MAWI menu item.
4 Click on the Select Clock Source menu item.
A clock source selection window is displayed.
5 Select the applicable clock source in the Clock Reference Source pick lists.
Uncheck the related check box if you do not want the displayed pick list item to be used.
6 Click on the OK button.
A status report window displays the results of the selection action.
7 Click on the OK button to close the status report window.
Enable CSMs
Each BTS CSM system features two CSM boards per site. In a typical
operation, the primary CSM locks its Digital Phase Locked Loop
(DPLL) circuits to GPS signals. These signals are generated by either an
on-board GPS module (RF-GPS) or a remote GPS receiver (R-GPS).
The CSM2 card is required when using the R-GPS. The GPS receiver
(mounted on CSM-1) is the primary timing reference and synchronizes
the entire cellular system. CSM-2 provides redundancy but does not
have a GPS receiver.
3