Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL DS-961D RFL Electronics Inc.
October 14, 2004 12 (973) 334-3100
FUNCTIONAL DESCRIPTION
The DS-961D Data Module has three basic configuration modes:
1. Five independent full duplex data channels with a common data rate of 1200 to 9600 bps.
2. Two independent full duplex data channels with a data rate of 19.2 kbps.
3. Two independent full duplex data channels with a data rate of 19.2 kbps, plus a third
independent channel with a data rate of 9600 bps.
Figure 5 shows a block diagram of the DS-961D.
TRANSMIT SIDE
Each input signal enters via a connection to the module adapter at the rear of the shelf. Data and timing
pass to the RS-232 line receivers on the DS-961D module. The module can be set to use transmit
timing from either the Data Terminal Equipment (DTE) input signals, or the DS-961D internal module
timing. The line receivers convert each channel to TTL output. If DTE timing is in use, each channel
then goes to its own three-bit buffer.
The Logic Array multiplexes the five channels together, adds a framing bit, and feeds the resulting bit
stream to the main multiplexer for transmission in the desired direction. User-selectable switches on
the module determine which time slot is used.
RECEIVE SIDE
The high speed multiplexed data from the receive direction enters the receive side of the Logic Array.
The Logic Array feeds the framing bit to a synchronization counter, which provides the proper timing
and phase to read out the five data channels.
The Logic Array and synchronization counter separate the data back into five TTL data signals. Each
channel then goes to an RS-232 line driver, which converts it back to RS-232 level. Finally, the RS-
232 output signal goes to the module adapter, where it passes to the output connector.
ALERTS/ALARMS
The RFL DS-961D module reports the following module level ALERT or ALARM signals to the shelf
Common Module. If the receive side cannot find a proper framing bit in the time slot selected, the DS-
961D will light its “FRM” LED and send a card-level ALERT to shelf Common Module. If a fault is
detected in the transmit circuitry, the module will light its “TX FAULT” LED and send a card-level
ALARM to the shelf Common Module.
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