Specifications

16/01/01 11:12 AM Overview 1-1
Chapter 1
Introduction
1.1 Overview
General
FLM-1 is a full duplex time division asynchronous multiplexer enabling up
to twelve async terminals to be multiplexed onto a single channel. FLM-1 is
intended for use in manufacturing facilities, building complexes, campuses
and other similar point-to-point and ring applications.
Versions
One of the following media options for the main channel interface is
available with the unit:
•
Electrical option (FLM-1/4W): 4-wire for transmission over two twisted
pairs (terminal block or RJ-45 connector)
•
Optical option (FLM-1/DF): Dual fiber for transmission over dual
fiber-optic cable.
Secondary channels are represented by six DB-25 connectors or 12 RJ-45
connectors. For detailed information about main and secondary channel
options see Section 1-4, “Technical Specifications” and Connecting the
Interfaces in Section 2-5.
Applications
Point-to-Point Application
FLM-1 is used mainly for point-to-point configurations where distances of
up to several kilometers are involved. Figure 1-1 shows a typical application
where a cluster of terminals is connected to a host computer through a
single link.
Maximum data rate on each FLM-1 subchannel is 19.2 kbps for the 4-wire
version and 38.4 kbps for the dual-fiber version, with 12.5% distortion
when working with 6 data channels and 25% distortion when working with
12 data channels or 6 data + 6 control channels.