Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Section 3. SYSTEM OVERVIEW
3.1 M-DACS THEORY OF OPERATION
3.1.1 INTRODUCTION
The IMUX 2000 M-DACS is a Drop/Insert T1 multiplexer with Digital Access Cross-Connect
functionality which also includes an Intelligent Line Switch (ILS) mode for sensitive teleprotection
applications where shorter through-delay is required. The M-DACS has a total of eight T1 ports. Two
ports (port 5 & 6) are directly tied to the T1 Common Logic Modules (CM4s), which does the
multiplexing and de-multiplexing of the DS0 data. The other six ports can be connected to another T1
network or a higher order multiplexer.
The basic M-DACS chassis consists of the DACS module made up of two boards, two CM4s, the M-
DACS communication I/O, one main power supply and the line I/Os and /or Optical interface(s).
Refer to Figure 3-1 for a view of the M-DACS chassis showing these modules installed.
3.1.1.1 SYSTEM LEVEL
A basic system block diagram is shown in Figure 3-2. The diagram shows a M-DACS Multiplexer
composed of the two CM4s that are tied to port 5 and 6 of the DACS module. For ports 1 through 4,
there is one Line I/O per port, which allows the replacement of a single I/O without impacting other
ports that may be on-line. Any of ports 1-4 may be equipped with a fiber interface, which uses only
one chassis slot.
To bring out port 7 and/or 8, a Line I/O module adapter with two ports is required in slot 1 and/or slot
4 in the rear of the M-DACS. In that configuration, port 1 & 7 will be on the same Line I/O and port 4
& 8 will be on the same Line I/O. Port 7 is also brought out via the communications I/O (MA-235).
The control of the M-DACS Multiplexer is accomplished by the local RS-232, the optional Network
Communication Module(NCM) or over an Ethernet network (using the MA-490 or a SAG module).
The CM4s perform the multiplexing/de-multiplexer of the DS0 data and is responsible to present the
user with status information regarding it self, the DACS module and the channel modules. The DACS
module composed of two boards, a processor board and a framer board controls the DACS
functionality. The processor is required to initialize and monitor the Framer board while the Framer
board performs all of the real-time T1 processing.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 3-1 (973) 334-3100
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