Chapter 1. System Overview and Modes of Operation
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The Dual Synchronous Data Channel Unit (DSDCU) is ideal for computer- aided design (CAD),
computer-aided manufacturing (CAM), and high speed batch data applications. This protocol-
transparent card also finds applications in multi-site polled or packetized LAN environments, and
videoconferencing. The DSDCU card incorporates proprietary local and remote loopback, plus
diagnostic and control capability.
The All Rate Office Channel Unit Data Port (OCUDP) supports both standard and Switched 56
Kbps Digital Data System (DDS) applications. It provides an interface between the DDS 4-wire
Alternate Mark Inversion (AMI) loop signal and D/I Mux III common equipment.
The Subrate Data Multiplexer (SDM) line card offers low speed synchronous and asynchronous
transmission. SDM channel units offer DDS-compatible operation and proprietary operation.
The premium SDM (pSDM) line card offers multipoint polling operation.
Voice Line Cards
D/I Mux III voice line cards provide the interface between the Pulse Code Modulation (PCM)
timeslot and the baseband voice and data signals.
Both hardware-configured and dual channel software-controlled 2-Wire FXS & FXO and 4-Wire
E&M, E&M/PLR; TO 4W with/SCG; MXS, MXO (for use with Northern Telecom Meridian PBX)
voice line cards and Orderwire cards are available for D/I Mux III multiplexers. .
Digital Program Line Cards
Digital program line cards provide an easily installed, economical radio program transmission
service over existing T1 carrier facilities. The transmit line card and the receive line card are both
required to make a complete circuit.
Transmit digital program line cards are used to transmit monaural or stereo audio programs over
T1 carrier facilities. The receive digital program line card provides studio-to-transmitter channel
lines over the T1 carrier facilities. The programming of the transmission path and allocation of
timeslots are user-programmable features.
The D/I Mux III offers the following digital program capabilities:
Transmits and receives monaural or stereo audio program over T1 carrier facilities
• 8 kHz or 15 kHz bandwidth
• Optionally equalizes frequency characteristics of various cable lengths
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