Weight Of The Mod600 Signal - ABB ETL600 Instruction Manual

ETL600
The following remarks have to be made to this equation:
1. The S-value describes the signals to be transmitted by the system
while all active internal TPEs and all connected external TPEs are
in the guard-state (quiescent state).
2. Regarding the TPEs, the weights of the guard signals have to be
used.
3. A correction term w
5.2.16.2. Considering its effect on the S-value, this term can be
interpreted as an additional signal, which is however physically not
present.
The peak envelope levels of the contributions of the individual signals
at the RF connector are given by
[
L dBm
i
where L
5.2.12.

Weight of the MOD600 signal

For a high datarate, the DPLC service needs a high SNR of 30 dB or
more. Thus a high weight should be given to the MOD600 signal. As a
consequence, most of the RF power would be given to the MOD600
signal, so that only little power would be left for the APLC signals,
resulting in low performance of the analog services. This problem is
avoided by specifying the MOD600 weight such that the level of the
MOD600 signal is always a fixed number of dB below the available RF
power. This leads to the following formula for the MOD600 signal
weight:
where
S
APLC
v
D2A
The value of the factor v
settings are possible:
MOD600 weight
where
B
DPLC
B
APLC
Configuration and Set-up
1KHW001489-EN
N
∑
=
S w
.
i
=
i 1
has to be added as explained later in section
corr
] [
=
PE L dBm
RF
is the PEP of the aggregate RF signal.
RF
=
w v
MOD 600 D 2
= Sum of the weights of all signals in all APLC channels;
= DPLC to APLC weight factor.
D2A
low
setting =
V = 1
D2A
Table 5-2
= Bandwidth of the DPLC channel;
= Sum of the bandwidths of all APLC channels.
⎛
]
+ ∗
⎜
PE 20 log
⎝
∗
S
,
A APLC
is configurable by HMI600. The following
medium high
2 3
DPLC to APLC weight factor
November 2005
ABB Switzerland Ltd
(19)
⎞
w
⎟
(20)
i
.
⎠
S
(21)
proportional
min(3, B /B )
DPLC APLC
5-9