TM 11-6625-3041-12/TO 33A1-8-908-1
The input data rate
Require-
ments
to the SG-1139 re-
ceiver must be the
same as that from
q The
input signal
must be unframed.
(Must contain only
data bits. Must not
contain overhead
bits such as for
synchronization,
parity, etc.)
All testing must be
done off-line (the
path must be taken
out of service).
A timing signal must
be provided when
testing with NRZ
signals (data-rate
families 576 and
128-4608).
Do not connect DI-
Diphase
PHASE signals to
Connections
unbalanced con-
nectors--they will
not work properly.
When a BNC cable is
connected to the
DIPHASE banana jacks
by means of a BNC
adapter, the other
end of the cable must be connected to another BNC adapter.
Normally the other adapter is located on the other DIPHASE
banana jacks or on the Interface Box. The other end of the
cable must not be connected to a panel-mounted BNC connector,
including one on the SG-1139. Panel-mounted BNC connectors
are always unbalanced (single ended).
Conditioned diphase
Diphase
signals work proper-
Polarity
ly normal or in-
It makes no
verted.
difference how the two DIPHASE OUT or the two DIPHASE IN con-
nectors are connected to the input or output of the path under
test as long as they are balanced inputs/outputs. It also
makes no difference how the BNC adapters are connected.