Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL OCUDP RFL Electronics Inc.
July 15, 2010 13 (973)
334-3100
PHYSICAL DESCRIPTION
The OCUDP module consists of a Level One LXT400 Transceiver integrated circuit, a logic Actel
chip, an SCB Actel chip, an 80C320 microprocessor with associated memory chips, DIP switches,
LEDs, and some interface and isolation circuitry. A functional block diagram of the OCUDP module is
shown in Figure 3.
The LXT400 performs the transmitter and receiver functions at the metallic bipolar interface, including
transmit pulse shaping, receive signal detection and timing recovery, line equalization, digital back-
end loopback, and monitoring of line status and equalizer performance. The chip conforms to the
AT&T, ANSI and Bellcore specifications. The logic Actel chip handles the channel interface to the T1
backplane signals, the digital logic to process the data, and the interface and control circuits to
communicate with the LXT400 and the microprocessor. The SCB Actel handles the interface between
the microprocessor and the SCB bus. The microprocessor performs the function of monitoring the data
and status information, communicating with the SCB bus, and controlling the functions of the board.
The main data flow remains within the logic Actel chip.
The OCUDP card also provides both the source and the sink for DC sealing current that is circulated in
the cable pairs to reduce splice resistance. In addition, polarity reversal of the sealing current is
required to signal the terminating DSU/CSU to initiate channel loopback. Sealing current should be in
the range of 4 to 20mA. Normal polarity is for the transmit pair to be negative with respect to the
receive pair. The card initiates channel loopback upon receiving the channel loopback code from
upstream by reversing sealing current. Both normal and latching loopback capability are provided. The
unit also loops the transmit pair back into the receive pair, disconnecting it from the customer loop.
Bantam access jacks permit module testing using a portable test set.
ALERTS/ALARMS
The RFL OCUDP module reports no module level ALERT or ALARM signals to the shelf Common
Module.
To Next Page
Loading...