Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
2.3.2 DACS MODULE
The DACS module is a two-card assembly, which is screwed together using four threaded spacers. The
assembly is made up of the Processor module (Figure 2-13) and the Framer module (Figure 2-14). The
two card assembly performs all of the DS0 cross-connect functions and plugs into the front of the M-
DACS chassis as shown in Figure 2-12. This module assembly is hot-pluggable.
The Processor module is responsible for controlling all DACS functions. The module contains a Rabbit
2000 8-bit microprocessor as its main processing unit. The module also contains the usual embedded
hardware support devices, which include an ACTEL FPGA (Field Programmable Gate Array)
containing support and control logic, and FLASH, NVRAM and Power Supply control circuits. It also
contains RS232 and RS485 drivers. The processor communicates with all eight framer chips on the
framer module and sets their operating parameters. Any DACS mapping or cross-connect switching is
also controlled by this processor. The processor constantly polls the framer chips for the status of T1
links and makes routing decisions based on this information.
The Framer module is used to reroute DS1 traffic from one port to another. The module has eight
integrated T1 framer chips, an external clock receive circuit, two dual-port RAMS for payload and
signal mapping, and an ACTEL FPGA for support and control functions (DACS mapping). The eight
incoming T1 signals are framed and decoded by these framer chips. They are then routed to another
FPGA where they are directed toward the appropriate framers for retransmission. All user interface
with this module is controlled by the processor board.
The user interface with the DACS module is through the RS-232 remote port on the MA-235 or
MA-240 which resides at the rear of the M-DACS chassis slot 5. This is used to configure the DACS
module or to poll the DACS module for status information.
This module has no hardware configurable items.
M-DACS-T1 RFL Electronics Inc.
October 16, 2012 2-24 (973) 334-3100
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