4280-dda.ib.rev0.doc
Page 10 of 17
11/03/2009
G.703 data connections - handshake operation:
The ZDA-4300RH is a double width rear assembly that takes the place of two standard rear assemblies that would
normally be fitted side by side. The ZDA-4300RH supplies the necessary controls between the two main cards.
Connect the two separate inputs and as many output connections as required. J2 corresponds to Output 1, J3
corresponds to Output 2, and J4 corresponds to Output 3. Only 3 of the 4 outputs are switched. The 4
th
output does
not pass through. Only good quality 75 Ohm connectors and cable should be used. The use of 50 Ohm BNC
connectors may cause serious reflection problems with G.703 signals, causing data errors.
In general cable runs should be kept as short as possible and should not exceed 200 metres for reliable error free
operation.
Handshake alarm connections:
Two Krone type connectors, 1SK2 and 2SK2, corresponding to each of the cards are provided on the rear panel of
the module providing the following:
Pin
1
Connection to ground indicates module is in bypass mode (loss of power).
2
Connection to ground indicates a general signal alarm.
3
External changeover request – connection to ground will make this module
Main
in
handshake mode.
4
Ground.
A third Krone type connector (SK3) provides remote status of which unit is
In Service (Main).
Pin
1
Connection to ground indicates that module 1 is the
In Service (Main)
module.
2
Connection to ground indicates that module 2 is the
In Service (Main)
module.
3
Ground.