5.4 OPERATIONAL PERFORMANCE TESTS
The operational performance test procedure in table 5-3 is used to system-
atically check the unit under simulated operating conditions. Table 5-3 is applicable
for all configurations of the Express Orderwire Multidirection Unit. All connection
points used in the test procedure are identified in figure 7-1.
The operational performance test procedure requires that all inputs and outputs
of the unit be properly terminated in 600-ohm dummy terminations.
After the operational performance tests are completed,
remove all of the terminating resistors that were
connected for the tests.
Since the Express Orderwire Multidirection Unit is an accessory device with
a wide range of possible input and output levels, the levels used in the performance
checks provided in table 5-3 are not written for any specific operational system.
Before any performance check can be accomplished on an operational system, it
is necessary to know the specific levels required for the system in which the unit
is used. The Express Orderwire Multidirection Unit is most commonly used with
all but one of its ports connected directly to multiplex lines. The inputs and out-
puts to and from the assembly are at the normal multiplex input and output levels;
the remaining port, terminals TB6-1 and 2 and TB3-1 and 2, is connected to the