Specifications

X723-300151 3-6 Issue 2
3.2.2 DT316 120 ohm I/O Adaptor
This adaptor uses three 9-way D-type sockets for connection to the two
PCM lines and the G.703 clock. The connections are balanced and are as
follows:
PCM connectors
PCM Out 5 and 9
PCM In 1 and 6
Ground 3
G.703 Clock connector
Clock Out 4 and 8
Clock In 2 and 7
Ground 3
Bypass
When the bypass relays are in the un-powered state, i.e. if the LIU is
removed from the chassis or if bypass is enabled by software, the relay
contacts will be in the bypass position. If the links on the I/O adaptor
LK1, LK2, LK3 and LK4 are in position 1-2 the PCM input on line 1 will
be connected to the output of line 2 and the PCM input on line 2 will be
connected to the output of line 1. If LK1, LK2, LK3 and LK4 are in
position 2-3 this connection from line 1 to line 2 will not be made.
When operating in terminal mode, the bypass facility should be disabled
by fitting the links in position 2-3.
It is not possible to disable the G.703 clock bypass facility. In the event of
power failure the G.703 clock input is always connected to the G.703 clock
output.