EndRun Meridian II, User Manual

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M e r i d i a n I I U s e r M a n u a l 122
C H A P T E R T E N
123 M e r i d i a n I I U s e r M a n u a l
R E A R - P A N E L I / O
The RJ48C connector is physically identical to an RJ45 connector. The RJ48C designation refers to
the interconnection and pairing within the applicable cable, which is different than that of Ethernet
cables. The RJ48C wiring pattern is shown below:
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��� ��� ������ � ���� � ��� � ���� ��� ������
�� ���������� � ���� � �� ����������
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�� ���������� � ���� � �� ����������
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������ ������ � ����� ���� � ������ ������
Connection to RJ48C BITS Clock Input
A crossover cable, as shown above, would be used to connect the EndRun Technologies clock buf-
fer output on RJ48C pins 4 and 5 to equipment with the BITS clock input on RJ48C pins 1 and 2.
Equipment with the BITS clock input on pins 4 and 5 would require a straight-through cable. The
shield ground is connected on pins 7 and 8.
Connection to Wire-Wrap Terminal BITS Clock Input
Use a RJ48C cable with 22 AWG solid wire for connection to wire-wrap terminals. Either connector
can be cut off to expose the individual twisted-pairs for this application. Determine the color-coding
of the twisted-pair connected to pins 4 and 5 of the remaining RJ48C connector. The wire con-
nected to pin 4 connects to the BITS clock Ring input wire-wrap terminal and the wire connected to
pin 5 connects to the BITS clock Tip input wire-wrap terminal. The drain wire associated with that
shielded twisted pair connects to the GROUND terminal.
Shield Ground Connection
The shield ground should be connected to minimize cross-talk. Connection to BITS clock inputs con-
forming to the pin-out described in Table 1 or connection as described for wire-wrap inputs will result
in a grounded shield. However, some RJ48C BITS clock inputs are wired with the shield connections
on pins 3 and 6. This situation can be accommodated by modification or replacement the EndRun-
supplied cable. This is compatible with the EndRun Technologies RJ48C clock output connector in
which pins 4 and 5 provide the BITS clock signal, while pins 1, 2, 3, 6, 7, and 8 are not connected.
Cable (655 ft maximum)
A 10 ft. T1 crossover cable, manufactured by Stonewall Cable (P/N SC-9598-X) is a good cable for
initial testing and typical T1, E1, or 64kCC installations. For other lengths or connector configura-
tions, use equivalent T1 or E1 cable qualified to match clock-type. T1 cable is compatible with E1
signals for short runs. Over 10 ft. use cable specified to match the application. Either cable type can
be used for 64kCC signals.