User's Manual

EMS Wireless Operator’s Manual
MirrorCell II CDM 812, CDM1912 Series
608112-1, Rev C
36
 When Automatic Set-up is initiated, variable attenuators are immediately set at
their maximum values of 30 dB. Thus, the UL and DL gain is 30 dB below the
specified value. This prevents the repeater from exceeding its maximum power
output specification in non-ideal installation situations.
 A power sensor measures the downlink signal level at the server output. If this
level is below the maximum output specification, or ‘PEAK’ level, the software
removes UL and DL attenuation in 1 dB steps until one of two things occurs:
o The ‘PEAK’ level is achieved. In this case, the donor signal is sufficient for
the repeater to achieve is ‘PEAK’ setting without using its full gain.
o All the attenuation is removed. In this case, the donor signal is too low for
the repeater to achieve its ‘PEAK’ setting with its available gain.
 If the donor signal level increases later (i.e. more channels are added), causing
the repeater to exceed its ‘PEAK’ setting, the software will automatically add
attenuation to keep the repeater within specification.
 If the donor signal level decreases later, the repeater will not remove attenuation
to boost the repeater output to its original level. That is, the software will only
add attenuation, but never remove it. This action differentiates this control
system from simple AGC systems. Normally, a base station and a handset
already have a power control system in place. The repeater gain does not
continuously change to maintain its ‘PEAK’ setting, as this would fight and defeat
the BTS power control function.
8.0 Technical Specifications
The MirrorCell

II specifications are divided into RF (Table 3), Electrical (Table 4)
Mechanical (Table 5), and Environmental (Table 6), shown below.
Parameters Uplink Downlink
Frequency – Models:
800 MHz:
Cellular A (A’’ + A)
Cellular B (B + A’ + B’)
Cellular AE (A’’ + A + A’
[Excludes B])
Cellular BE (B + B’
[Excludes A’])
Cellular Full Band
Public Safety
ESMR
ESMR Full
1900 MHz:
824 – 835 MHz
835 – 849 MHz
824 – 835 MHz, 845 –
846.5 MHz
835 – 845 MHz, 846.5 –
849 MHz
824 – 849 MHz
821 – 824 MHz
806 – 821 MHz
806 – 824 MHz
869 – 880 MHz
880 – 894 MHz
869 – 880 MHz, 890 –
891.5 MHz
880 - 890 MHz, 891.5 –
894 MHz
869 – 894 MHz
866 – 869 MHz
851 – 866 MHz
851 – 869 MHz