User's Manual

EMS Wireless Operator’s Manual
MirrorCell II CDM 812, CDM1912 Series
608112-1, Rev C
27
 The automatic setup can be started by typing ‘RESTART’. The repeater will go
through the setup routine to achieve the peak limit output power as set above.
This can take up to a minute to complete and will display a message when it is
complete.
 A complete list of alarms and their respective alarm code numbers is shown in
Appendix B.
 The use of external alarms for the MirrorCell II is detailed in Appendix C.
Important Notes:
 The MirrorCell

II repeater will attempt to set itself to the PEAK limit output power
setting using its available gain. If input (donor) signal is insufficient to reach the
output power PEAK setting with the repeater’s available gain, the repeater will
remain set using the maximum gain to an output power level of
(INPUT SIGNAL LEVEL) + (REPEATER MAX GAIN) = (OUTPUT POWER
LEVEL)
 If the repeater is to be moved from its current location to a new location, it is
recommended that you manually set the attenuation values to maximum (30 dB)
before turning it off.
 Ensure that all RF connections remain watertight and mechanically secure.
5.0 System Optimization
The repeater uses highly selective Surface Acoustic Wave (SAW) bandpass filters,
which have a group delay of 3 microseconds. Since the propagation delay of free
space is 5.4 microseconds per mile, the delay is “equivalent” to somewhat more than
½ mile of free space propagation.
The neighbor lists of the donor base station and the base stations surrounding the area
served by the repeater may need to be adjusted after the repeater is installed. For
example, in Figure 9, a repeater extends the coverage of BTS1 to a new area. BTS1
is now a neighbor with BTS4 and BTS5, whereas without the repeater, BTS1 is a