Triple-Play Service Deployment

228
R ate (Mbits /s )
performance over various types of copper pairs as well as its
susceptibility to radio frequency interference. Perhaps the most
significant unknown is the precise rate and reach performance on
a given loop.
Figure 9.5 summarizes rate and reach performance of several
DSL technologies.
140
120
100
80
60
40
20
AW G 26, G ap = 12dB , 20-s elf, Tx P S D = -53 dB m/Hz
Figure 9.5 DSL Rate and Reach Performance by Band Plan
Chapter 9: Troubleshooting High Speed Data Service
30 MHz
25 MHz
20 MHz
17.6 MHz
12 MHz
8.5 MHz
4.4 MHz
2.2 MHz
1.1 MHz
0 1 2 3
Loop Length (kft)
4 5 6
Table 9.1 summarizes the amateur radio bands that must be
protected from interference by VDSL deployments as specified in
ITU G.993.2. DSLAM configurations allow the removal from usage
any of these bands based upon a given geographic territory’s
requirements for protection. These radio bands or “notches”
impact potential maximum data rate performance by their
removal of usable spectrum.