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W5-Ethernet-Manual.doc

Version 2.0-01

Watson 5 Ethernet

Operating Manual

Revision: 2006-04-27 3-5

3 Modem Features

3.1 DSL

3.1.1 Linerates and DSL sync rates

Watson 5 Ethernet supports SDSL as specified in ETSI TS 101 524 and ITU-T G.991.2. The line-

code used is TC-PAM 16, the maximum linerate rate per pair is 2'306 kbit/s (36 timeslots with 64

kbit/s each).

The Watson 5 Ethernet plugin can be configured for the 2004 revision of ETSI TS 101 524, also

known as eSDSL (ETSI) or G.SHDSL.bis (ITU-T). G.SHDSL.bis allows for higher symbol rates and

a 32-level linecode (TC-PAM 32). The maximum number of timeslots per pair in G.SHDSL.bis is 89,

the maximum linerate rate per pair is 5'696 kbit/s.

There is some overlap between the linerates attainable in G.SHDSL and G.SHDSL.bis, cf. Figure

3-1:

Figure 3-1: G.SHDSL and G.SHDSL.bis linerates

This means that for certain linerates either TC-PAM 16 or TC-PAM 32 can be configured in the mo-

dem. TC-PAM 16 has the better DSL performance than TC-PAM 32. However with linerates rates

higher than 2.3 MBit/s (36 timeslots) and TC-PAM 16 the symbol rate over the DSL becomes higher

than what was specified in the original version of TS 101 524. Higher symbol rates mean wider

PSDs which in turn can lead to higher interference to other DSL systems in the same cable binder,

e.g. ADSL, ADSL2, ADSL2+.

The linerate rate, i.e. the data rate available to the application is calculated as follows:

[]

)(

893

pairpertimeslotsofnumbern

pairswireofnumberm

skbitnmLinerate

××=

Note: n = 3 … 36 for the Watson 5 Ethernet tabletop modem

TC-PAM 16

-TC-PAM 16

-TC-PAM 32

G.SHDSL, ETSI TS 101 524

G.SHDSL.bis, ETSI TS 101 524 (2004)

1'0001'000 2'0002'000 3'0003'000 4'0004'000 5'000 5'000 6'0006'000

Linerate

kBps

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 102 103

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