User Manual

ADCP-XX-XXX • November 2000 • Section 3: WMTS Functional Description
Page 3-7
 2000, ADC Telecommunications, Inc.
with a synchronization byte. Searching for this MPEG-2 sync byte, which repeats at both a fairly quick
and regular interval, makes it easier to synchronize with the overall bit stream on the channel. Since
the newly installed WMU searches several forward path channels for data, this feature helps the
WMU to find the proper channel sooner.
4.8 Forward Channels
The WMU accepts a RF modulated signal with characteristics as described in Table 4.2. The output
signal level of the WMTS is variable over the range of 50 - 61 dbmv.
Table 4-2. Electrical Input to WMU
PARAMETER
Center frequency 91 to 857 MHz ±100 kHz
Level range (one channel) -15 dBmV to +15 dBmV
Modulation type QPSK, 16QAM, 64QAM
Symbol rate (nominal) 5,057 Msym/sec (64QAM) and 5.304 Msym/sec 16QAM, QPSK
Bandwidth 6 MHz
Total input power (40-900 MHz) <30 dBmV
Input (load) impedance 75 ohms
Input return loss > 6 dB
Connector F connector per [IPS-SP-406] common with the output