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72
Configuring the 56/64 kbit data
communication modules
Switch 3 and 4 are used to set the source of timing. The function is according to the set-
ting of timing signal,
table
mission, one modem should be set for locally created timing and the other for timing
recovered from the received signal. When the modems are communicating with a trans-
ceiver 21-15X or 16X the modems shall be set for timing recovered from received op-
tical signal, see setting of timing signal.
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OFF
OFF
Timing created by the modem
OFF
ON
Timing recovered from received optical signal
ON
OFF
Timing created by the MPM module
ON
ON
No timing, the data transmission will not work
There are also some jumpers on the circuit board that have to be correctly set. One, S4
according to
figure
36, is for changing the functionality between article number
1MRK 001 370-BA delivered with version 1.1, 1.2 and 2.0.(marked 1MRK001471-
BA) and 1MRK 001 370-DA delivered with version 2.3 and higher (marked
1MRK001471-DA). The difference between these two is that the transmitted and re-
ceived signals are inverted in relation to one another.
When a terminal of version 1.1, 1.2 or 2.0 is to communicate with a terminal of version
2.3 or higher it is necessary that the jumper is changed to 1 MRK 001 370-BA in the
version 2.3 terminal. This is because older versions of this module lack the capacity to
set article number, they are set in 1 MRK 001 370-BA. If both terminals however in-
clude modules with capacity to change article number it actually doesn't matter which
article number is used as long as the same number is used in both terminals.
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36. When using the modem for optical point-to-point trans-
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