East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer, Operation Manual

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166119
8/31/2006 3
1 Introduction
The Nx8-DualMUX is a modular, 16 Port Dual-composite TDM multiplexer for high-speed
serial data terminal equipment. It is designed to work in a paired, point-to-point configuration
over one or two synchronous composite clear-channel links of up to 128Kbps each.
The system may be configured with from 4 to 16 channel ports, operating at rates up to 38.4
Kbps asynchronous, or up to 64Kbps synchronous.
The system is configured and managed by the user through an RS-232 Console port terminal
interface to either a computer/laptop running a terminal emulation program, or a standard
ASCII dumb terminal.
1.1 Network Configurations
The Nx8-DualMUX may be used in Point-to-point applications with different types of
equipment and circuits. As long as the circuits between the two units is synchronous and
provides transparent data transport, the link should operate. Even geosynchronous satellite
delays up to 0.5 sec are tolerated without any problem.
Figure 1 shows an example of utilizing a service provider‟s digital carrier service. In most
such applications, the carrier‟s equipment provides a clock timing source at some multiple of
64 Kbps. If needed, the Nx8-DualMUX can provide timing at many n x 64Kbps rates, up to
2,048Kbps from an internal oscillator on one end of the link, and synchronize to that rate on
the other end. This is also helpful when connecting units back-to-back in limited distance
applications.
Digital Carrier
Network
Up to 128Kbps Aggregate Channel Bandwidth w/o Backup
(Links A & B may be unequal rate)
-OR-
Up to 256 Kbps Aggregate Channel Bandwidth w/Backup -
HI & LO priority channels (Links A & B equal rate)
Nx8 DualMUX Nx8 DualMUX
<128 Kbps
<128 Kbps
Link A
Link B
T
T
T
T
T
T
T
T
Up to 16 terminal devices
Clock timing
Clock timing
Figure 1 Point-to-point Link using Digital Carrier
The Nx8-DualMUX may also be used in conjunction with higher-rate multiplexing equipment
as a sub-multiplexer. An example of this is shown in Figure 2. The Nx8-DualMUX units may
each be assigned one or two ports on the larger multiplexer and those ports programmed for
operation at any of the selectable n x 8Kbps rates.