CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 76)

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Canoga Perkins
4.9 Programmable Buffered Interface / Model P53
Signal Full Name Direction
TxD Transmit Data To Modem
RxD Receive Data From Modem
SCR Serial Clock Receive From Modem
SCT Serial Clock Transmit From Modem
SCTE External Clock Transmit To Modem
Table 4-O.
BNC Supported
Signals
The Model P53 Interface Module complies with EIA Standard RS-530 while all clock,
data and control signals follow the RS-422 standard. The basic configuration of the
P53 interface is a DCE device (w/Fem DB-25) and two connector adapters are
provided with the interface: the DCE / DTE adapter which converts the interface to
the DTE form (w/Male DB-25) and the "Legacy" adapter which converts the interface
to the original Model P2 interface.
This interface implements a set of circuits (resources) which can be interconnected
in various ways to satisfy a host of differing applications. These resources are:
•
a 16-bit FIFO (first-in, first-out) buffer
•
an inverter
•
a switchable delay line
The FIFO can be utilized to buffer either the received or the transmitted data (not
both). The Delay Line, in conjunction with a four-position DIP switch, provides an
option for fine tuning the relationship between clock and data timing. Table 4-P
defines the delay lines versus switch settings for the Model P53 Interface.