Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL DS-562I RFL Electronics Inc.
June 14, 2007 31 (973)
334-3100
FUNCTIONAL DESCRIPTION
The following is a basic description of how the RFL DS-562I module operates. A simplified block diagram of
the module is shown in Figure 13.
MODULE OVERVIEW
The DS-562I synchronous data module is a channel card for use in the IMUX 2000 system. It transmits and
receives data from/to the T1/E1 bus and generates and receives data via an I/O adapter module. The module can
be set up and interrogated remotely via the SCB of the IMUX 2000. DIP switches enable the user to set up the
module locally. Seven front panel LEDs indicate to the user the status of the module.
The module provides the following five major functions: T1/E1 transmit interface, T1/E1 receive interface,
loopback, SCB interfacing, and control logic. The Actel 1280XL and its associated circuitry handles all T1/E1
communication and I/O. The Actel 1020B connects the Actel 1280XL with the SCB of the IMUX 2000.
Miscellaneous other circuits are present to handle the remaining functions. A bank of dip switches is provided
to select the module parameters, a toggle switch is provided to select the loopback function, and LEDs provide
the user with module status.
COMMS FPGA CIRCUIT
The Comms FPGA circuit consists of an Actel 1280XL which is the heart of the DS-562I module. It has several
main functions which include T1/E1 receive and transmit control, SCB interfacing, LED control, reading switch
settings, equipment and payload loopback, addressing and CRC, and I/O decoding for G.703. The Actel
contains two phase locked loops for generating the 56 or 64 Kbps clocks synchronous to the T1/E1 input
signals.
SCB FPGA CIRCUIT
The SCB FPGA circuit consists of an Actel 1020B which is used to communicate with the CM3B/C module via
the SCB. A DIP switch is provided to allow the user to set the SCB address of the module which is read by the
SCB FPGA. The DS-562I module has a type ID of 119 encoded into the SCB FPGA device.
I/O ADAPTER MODULES
The signals to and from the user equipment pass through the I/O module. The I/O module performs the required
level shifting between the DS-562I and the user equipment, thus allowing the same channel card to be used with
any one of four different types of communication interface I/O adapter modules.
T1/E1 TRANSMIT CIRCUIT
The 56 or 64 Kbps serial data from the user equipment is routed to the transmit circuit which synchronizes the
signals and then feeds them to the T1/E1 data bus. If addressing is being used in the 56 Kbps mode, the transmit
address is inserted into the data stream along with security coding information.
T1/E1 RECEIVE CIRCUIT
The incoming serial data stream is received from the T1/E1 bus by the receive interface and routed to the user
equipment. If addressing is being used in the 56 Kbps mode, coded address and security information is
extracted and verified, and then compared to the selected received address.
To Next Page
Loading...