Specifications
X723-300151 2-7 Issue 2
2.2.5 PCM and G.703 Clock Connections
The Dual LIU utilises either the DT315 or DT316 I/O adaptor for
interfacing to 75 or 120 ohm lines respectively. These plug into the I/O
connectors shown in Figure 1-3.
The DT315 has 75 ohm BNC unbalanced connectors, with the 'screen' of
the transmit connector earthed by mechanically securing it to the body of
the I/O adaptor. The 'screen' of the receive connector is isolated from the
body of the I/O adaptor with insulating washers.
If it is required to earth the 'screen' of the receive connector instead of the
transmit, then it is necessary to re-assemble the I/O adaptor with the
insulating washers fitted to the transmit connector.
The DT316 has PCM connections using two 9-way D-type connectors. The
transmit O/P signal is present on pins 5 and 9, and the receive I/P signal
is on pins 1 and 6. The cable screen should be connected to the body of the
connector.
The clock signals are presented on a separate 9-way D-type connector with
the transmit clock on pins 4 and 8, and the receive clock on pins 2 and 7.
The cable screen should be connected to the body of the connector.
The Dual LIU I/O adaptors are equipped with bypass relays that will, on
power down or under firmware control, bypass PCM line 1 to line 2, and
Clock in to Clock out. This action may be inhibited for the PCM signals
only by fitting links LK1-LK4 on the I/O adaptor to positions 2-3.
2.2.6 Data Wiring
The connectors on the back of the chassis allow for data connection to
channel cards. Data connectors must be inserted to the corresponding
connector for the channel card positions. i.e. a channel card in P3A must
have its data connector inserted in to the corresponding connector marked
P3A on the rear of the unit. The connector type is a 96-way DIN 41612
Type C plug (Male).
The pin allocations for channel cards vary from card to card. A detailed
pin out can be found in the relevant channel card manual.
A universal I/O adaptor DT280 is available to convert the 96-way DIN
41612 Type C plug to a 50-way Amphenol Female Connector.