ABB ETL600 Instruction Manual page 174

ABB Switzerland Ltd
The following signal settings can be configured for MOD600 modem
with the appropriate selection of radio buttons or drop down list:
•
Status :
•
•
•
Operating mode : every DPLC link must consist of one Master and
one Slave station.
•
MOD600 weight : this parameter defines the splitting of the
transmitted power between DPLC signals (MOD600) and
remaining APLC signals.
•
•
•
•
•
Interrupt timeout : Low (0.3 s) , High (1.5 s)
This parameter defines the time for the modem to perform a restart
when a channel interruption occurs.
•
Transmission optimized for : Low delay , ..., High efficiency
A trade-off between highest possible datarate and lowest possible
transmission delay time can be configured.
The configurations of the data rate for the MOD600 modems for the 5
fallback/fall forward profiles must be done in descending order with the
highest selected data rate on the left and the lowest on the right.
To ensure data transmission without frequent interruption, data rate
increase/decrease from one profile to the next should correspond to an
SNR difference of not more than about 6 dB.
When the DPLC channel multiplexer is enabled and different data
communication channels are transmitted on the MOD600 modem, for
each of the MOD600 data rate profiles a different setting for single
channels must be configured.
When configuring these data rates, the sum of all channels added to
the multiplexer overhead m may not exceed the selected data rate for
the modem. HMI600 will signal the profiles that are not compliant to
this requirement by highlighting in red color.
Remarks:
5-30
1KHW001489-EN
Off : the modem is not operational, communication is
interrupted;
On – disconnectable : the modem is operational;
communication will be interrupted during transmission of a
teleprotection command.
Low : DPLC & APLC signals have the same PEP (peak
envelope power);
Medium : DPLC signal has twice the PEP of the APLC signal;
High : DPLC signal has three times the PEP of the APLC
signal;
Proportional : PE voltage is distributed proportionally to the
bandwidth taken by DPLC and APLC signals
(BW / BW = PEV
DPLC APLC
November 2005
/ PEV )
DPLC APLC
Configuration and Set-up
ETL600