Nortel DualMode 800, Руководство по обслуживанию

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11-40 DRU tests
411-2051-500 Draft 00.01 November 1999
4. From the terminal, select the channel assigned to the TRU under test by
using the B command.
>B
The TRU will request a channel number. Enter the channel number for the
frequency assigned to the DRU under test (1...799 or 990...1023). Refer to
Appendix A for the channel-to-frequency conversion information.
>xxxx
On a successful channel change, the Channel and Synth Lock fields will
be updated:
Channel: xxxx
(DRU channel number indicated)
Synth Lock: YES
(Sync Lock changes to ‘YES’)
5. On the communications monitor, set the transmit RF frequency to the
frequency corresponding to that of the TRU under test.
6. Proceed with the RF output power test.
Requirements on the Transmit RF output power test
When performing the Transmit RF output power test, make sure that power
initialization has been performed (refer to Chapter 1). Also, take into account
the number of channels supported by the MCPA and the component (cable,
duplexer) loss along the transmit path.
Table 11-5 lists the maximum per-channel power levels per carrier measured
at the output port of the MCPA shelf for different channel counts and MCPA
combinations in a DualMode 800 Enclosure. The power per channel calculation
is based on the following assumption:
• output of TRU at +15 dBm and nominal gain at -12 dB, giving an overall
TRU output of +27 dBm
Figure 11-8 shows the per-channel transmit power level at the output of each
component for a 24-channel cell/sector using two MCPA modules.
Table 11-5
DualMode 800 Enclosure per-carrier power level at the output port of the MCPA shelf
1 MCPA module 2 MCPA modules
8 channels 12.50 W 25.00 W
16 channels 6.25 W 12.50 W
24 channels 4.17 W 8.33 W
32 channels 3.12 W 6.25 W