P54x/EN OP/La4 Operation
(OP) 5-112
MiCOM P543, P544, P545 & P546
OP
2.1.12.3 Baseband modem propagation delay
The use of a baseband modem will bring an additional propagation delay time that needs to
be taken into account. For a 2-wire connection to the Campus modem the additional delay
will be 1.02 ms. For a 4-wire connection to the Campus modem the additional delay will be
1.08 ms.
2.1.12.4 Baseband modem and relay configuration
A schem
e configuration using 2-wire connection without additional isolation is shown in the
figure below:
The P54x relays should have their Prot Comms Mode set to standard, their data rates set
to 64kbits/s, and their clock sources set to external.
One of the Campus modems on the pilot wire should be assigned as a master and the other
assigned as slave. The master should be set to generate an internal clock, and the slave
should be set for receive recovery. This is achieved by means of setting dual in-line (DIL)
switches inside the modem. To implement these settings, the switches should be set as per
the tables below:
Master
S1 (on the bottom side of the modem)
Pin no 1 2 3 4 5 6 7 8
Setting 1 0 1 0 0 1 1 1
S2 (on the bottom side of the modem)
Pin no 1 2 3 4 5 6 7 8
Setting 0 0 0 0 0 1 0 0
S? (inside the interface card)
Pin no 1 2 3 4
Setting 1 0 1 1
Slave
S1 (on the bottom side of the modem)
Pin no 1 2 3 4 5 6 7 8
Setting 1 0 1 0 0 1 1 1
S2 (on the bottom side of the modem)
Pin no 1 2 3 4 5 6 7 8
Setting 0 0 0 0 0 1 0 0
S? (inside the interface card)
Pin no 1 2 3 4
Setting 1 0 1 1
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