Triple-Play Service Deployment

230
Chapter 9: Troubleshooting High Speed Data Service
In order to simplify some VDSL complexity, the standards
introduce the concept of “profiles.” According to ITU G.993.2,
“profiles are specified to allow transceivers to support a subset of
all the settings and still be compliant” with the standard.“
Multiple profiles allow vendors and service providers to limit
implementation complexity” and target specific service requirements.
Profiles mentioned include 8a, 8b, 8c, 8d, 12a, 12b, 17a, and
30a where the number indicates the upper limit of the frequency
spectrum to be used. Table 9.2 below provides a few examples.
8b 17a 30a
Maximum aggregate downstream transmit power (dBm) +20.5 +14.5 +14.5
Maximum aggregate upstream transmit power (dBm) +14.5 +14.5 +14.5
Subcarrier spacing (kHz) 4.3125 4.3125 8.625
Minimum net aggregate data rate (Mbit/s) 50 100 200
Typical use case CO FTTN FTTB Japan
Annex A, Annex B (998) Index of highest supported downstream
data-bearing subcarrier (upper band edge
frequency in MHz (Informative))
1971 (8.5) N/A N/A
Index of highest supported upsteam
data-bearing subcarrier (upper band edge
frequency in MHz (informative))
1205 (5.2) N/A N/A
Annex C Index of highest supported downstream
subcarrier (upper band edge frequency in
MHz (informative))
1971 (8.5) 4095 (17.664) 2098 (18.1)
Index of highest supported upstream
subcarrier (upper band edge frequency
in MHz (informative))
1205 (5.2) 2782 (12) 3478 (30)
Table 9.2 VDSL Profile Examples