Specifications

Telephone Interface 59
4.1.3 Connection Between the Module and TLI
This section describes the actual connection between the DTC04 module
and the TLI assembly. The module and TLI are connected over a 20-pin
cable. Figure 4-1 is a diagram of the connector. Table 4-1 describes each
pin assignment.
MA-0565-88
Figure 4–1 20-Pin Connector
Table 4–1 Pin Assignments
Pin Name Function
1 +12 V Supplies +12 V to TLI assembly.
2 +5 V Supplies +5 V to TLI assembly.
3 TLI INSTALLED L Indicates to the DTC04 module that the
Q-bus IO connector bulkhead is plugged
in. The module can use this signal to help
isolate faults. The bulkhead must ground
this signal.
4 GND Ground.
5 ONE WIRE L Indicates to the DTC04 module whether the
TLI is using a one-wire SLD data lead (on
the TX DATA H line) or a two-wire SLD
data lead. In either case, the TLI sends its
identification code over the RX DATA H line.
The TLI ONE WIRE line should be grounded
for a one-wire operation, and floated for
a two-wire operation. The TLI assembly
can use one-wire or two-wire operation.
The North American TLI uses a one-wire
operation.
6 GND Ground.