Figure 3. Rj-48C Pinout Configuration; Loop Connections; Operation; Power Interface - ADTRAN QDFR Unit Installation And Maintenance Practice

LOOP CONNECTIONS

The T1 loop connections are made through four RJ-48C type connectors. For each connector,
transmit tip and ring are on pins 5 and 4, and receive tip and ring are on pins 2 and 1, respec-
tively. The single-mode fiber is connected to the SC connector located on the back panel of the
unit.

OPERATION

The Quad Fiber Remote (QDFR) Unit provides a platform to exchange data between four Tls
and an optical fiber interface. The customer data connection is via the RJ-48C connectors on
the unit. An optical fiber interface is provided for communication with the loop. The Quad
Fiber Remote (QDFR) Unit operates with a QDFC module at the other end of the fiber optic
cable. The figure below illustrates the pin-out configuration for the RJ-48C connectors.
To Network

Power Interface

The power for the QDFR can be supplied through a –48 VDC supply connected to the back of
the QDFR. The QDFR can be powered from –24 VDC to –48 VDC.

Diagnostics

There are several options available for diagnostics:
• Front panel LEDs (see
• "Loopback and Test Commands Menu"
• "Performance History Menu"
• "Troubleshooting Menu"
61181307L7-5E
T
R
Receive from Network
Reserved for Future Use
T1
R1
Transmit to Network
Miniature 8-Position Plug

Figure 3. RJ-48C Pinout Configuration

Table 2 on page 4)
on page 16
on page 22
1 2 3 4
R T R1
To Registered Terminal Equipment
on page 12
Loop Connections
5 6 7 8
T1
5