Fig. 3-9 Etl640/680 Configurations - ABB ETL600 Instruction Manual

ABB Switzerland Ltd
13
13
6 1
1
or or
2
2
2
9R 6R 5R 6R 6R
B O
LF
Fig. 3-9
Slot types for channel subrack 7 (P7LC), Fig. 3-9:
B: Basic equipment
O : Optional RF equipment (depending on desired RF-frequencies
RF
and -power)
O : Optional LF equipment (depending on desired services)
LF
Interface boards 1 (O4LE) and 2 (G4AI) are required to support the
APLC services telephony, teleoperation and teleprotection. These
boards have to be inserted in the foreseen slots O
subrack 7. Up to seven interface boards may be inserted in an ETL640
or ETL680. They galvanically separate the interface signals from the
equipment and transform these signals into a form suitable
•
for transmission over the equipments Time Division Multiplexing
(TDM) bus and
•
for Frequency Division Multiplexing (FDM) into the AF-channel(s),
refer to Fig. 3-5.
The FDM concept allows the available frequency band to be shared
between the teleprotection service and the other services by switching
these off during transmission of teleprotection commands and thus
making the full output power of the PLC equipment available to
teleprotection. This technique is called 'boosting'.
3-12
1KHW001489-EN
9
9
5
3 1
1 1
or or or
2
2 2
4
6R 14R 6R 5R 6R
B O
LF
ETL640/680 configurations
November 2005
10
11
12
2
6R 9R
O
RF
Structure and Function
ETL600
8 14
8 14
5
7
of the channel
LF