Schmid Watson Installation Guide Page 19

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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 10
3.1.2 Line Rate
According to ETSI TS 101 524 Watson 5 supports payload bit rates on multiples of
64 kbit/s with the optional use of Z-bits.
Payload Block Bit Rate = N 64 kbit/s + i 8 kbit/s
with 3 N 36 and i = 0, 1
Watson 5 offers the option of configuring one Z-bit as a supplementary bandwidth enhancement
to the embedded operating channel (EOC) within the SHDSL overhead.
The effective bandwith of the eoc without Z-bits is 3.2 kbit/s within the total of 8 kbit/s SHDSL
overhead.
Watson 5 offers the option of configuring 2p and 4p operation of the data transmission if this
feature is supported by the corresponding modems.
The corresponding line rates for each pair are:
Line Rate = + 8 kbit/s + 8 kbit/s
N
umber of Pairs
N
64 kbit/s
SHDSL OH
incl. EOC
optional
Z-bits
Therefore in order to set up the basic transmission parameters one has to configure the line rate,
the number of transmission pairs, and the use of optional Z-bits for increasing the capacity of
the embedded operating channel.
Note: In spite of the fact that a lot of different line rates or payload bit rates can be configured
performance (noise margin of testloops) is evaluated only for a small subset of payload bit rates
according to ETSI TS 101 524:
1p transmission 2p transmission 4p transmission
N Payload bit rate used in test
loops (kbit/s)
DSL time slots TS per pair
6 384 6 - -
8 512 8 - -
12 768 12 6 -
16 1024 16 8 -
20 1280 20 - -
24 1536 24 12 6
32 2048 32 16 8
36 2304 36 - -
Table 3-1: TS distribution over 1p, 2p and 4p operation
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