NIO CommKit Host Interface Installation and System Administration Manual

2-5

Installing the NIO CommKit Host Interface

Connecting the Fiber Optic Cables

The cable that you use to connect the Datakit interface board to the VCS

switch must be an AT&T 62.5 micron ﬁber optic cable with two split-ferrule

straight-tip (ST) connectors on each end.

On each end of the cable, one connector is for the transmit connection and

one is for the receive connection. The positions of the transmit and receive

connections are reversed on the two ends of the cable. The ﬁber optic cable

is actually made of a pair of ﬁber-optic strands bound together.

For more information about ordering these cables, refer to the Appendix C,

“Ordering Information”.

The ST Connectors

The ST connectors on the ends of the ﬁber optic cable consist of a thin

plastic tube that is inserted into the jack of the board, a small inner metal

ring, and a larger outer metal ring. The outer metal ring rotates around the

inner metal ring.

The inner ring of the ST connector has a small nub that ﬁts into a groove on

the right (or left) side of the jack on the edge of the board. Then, the outer

ring has two J-shaped slots that ﬁt around nubs on the top and bottom of the

jack. After you connect both the inner and outer rings, you rotate the outer

ring to the right to lock the connector in place.

Connecting an ST Connector To a Board

1 Hold the connector so that the small nub on the inner ring faces to the right (for

a Datakit interface board) or to the left (for a CPM-HS module).

2 Turn the outer ring so that the J-shaped slots face directly up and down.

3 Slide the connector toward the jack until the small nub on the inner ring fits into

the corresponding groove on the right or left side of the jack.

4 Press the outer ring in until the J-shaped slots fit around the nubs on the top and

bottom of the jack.

5 Rotate the outer ring one-quarter turn to the right to lock the connector in place.

6 Pull on the connector gently. If it is connected correctly, it should not disconnect.