Symmetricom TimeSource 3600, Manual

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88
TimeSource 3600
S S S S S S S S S S S S S S S S S S S S S S S S S S S S S
E1 or Analog Reference Inputs
Warning:
Because the E1 input circuits do not provide
lightning protection, do not connect the E1 input line directly
to a point outside the building. Failure to observe this
warning may result in equipment damage.
E1 or analog reference sources, traceable to an independent
Stratum 1 source, can be connected to further increase holdover
stability, or to be monitored by the TimeSource 3600. In either
case, connect reference inputs to the wire-wrap pins or BNC
connectors labeled SPAN IN A and SPAN IN B. If using the wire-
wrap pins, connect the tip wire to the pin labeled T, the ring wire
to the pin labeled R, and the shield (if connected at the
TimeSource 3600) to the pin labeled S. See Figure 24 for the
location of the connectors and pins, and Figure 27 for the wire-
wrap connections.
Notes:
1. The shield pin is capacitively coupled to ground. Normally, the
shield is grounded at the source. Grounding the shield at both
ends is not recommended.
2. A BNC connector can be used for one input, and a wire-wrap
connector can be used for the other input, but do not use the
BNC and wire-wrap connectors of the same input
simultaneously. For example, a BNC connector can be used for
input A and the wire-wrap pins for input B, but do not use the
input A BNC connector with the input A wire-wrap connector.
Figure 27. E1 or Analog Input Wire-Wrap Connections
T
R
S
T
R
S
B
A