User Manual

ADCP-XX-XXX • November 2000 • Section 3: WMTS Functional Description
Page 3-3
 2000, ADC Telecommunications, Inc.
2 IMPLEMENTATION
2.1 Overview
The downstream channel utilizes a 6MHz bandwidth, which is transmitted by an antenna through the
power combiner and waveguide. The upstream channel can be split into several independent sub-
channels of different channel widths. The upstream channel may use directional antennas to
reallocate sub-channels in different areas.
2.2 Data Throughput
The data throughput is a factor of the symbol rate and modulation scheme.
Table 2-1. Data Throughput - Upstream
UPSTREAM
NOMINAL THROUGHPUT PER SUB-CHANNEL
BITRATE
(NOMINAL)
CHANNEL
WIDTH
SYMBOL RATE
QPSK
(2 BITS PER
SYMBOL)
400 KHz 320 Ksym/sec 640 Kb/s
800 KHz 640 Ksym/sec 1280 Kb/s
1600 KHz 1280 Ksym/sec 2560 Kb/s
Table 2-2. Data Throughput - Downstream
DOWNSTREAM
NOMINAL THROUGHPUT PER CHANNEL
CHANNEL
WIDTH
MODULATION
TYPE
SYMBOL RATE BIT RATE
6 MHz QPSK 5.304 Msym/sec. 10.6 Mb/s
6 MHz 16 QAM 5.304 Msym/sec. 21.2 Mb/s
6 MHz 64 QAM 5.0565 Msym/sec. 30.3 Mb/s