GAI-Tronics LE200, LE200-FSR, LE200-FLR Page/Party Line Extenders - Manual (Page 26)

Pub. 42004-701L2F
M ODEL LE200 S ERIES W ALL -M OUNT P AGE /P ARTY
®
L INE E XTENDERS P AGE 24 of 50
f:\standard ioms - current release\42004 instr. manuals\42004-701l2f.doc
04/09
Contact Closure Input Transmission
A pair of Model LE200s provides contact closure detection and transmission for five contact closure
inputs. An input contact closure on the local Model LE200 results in the corresponding output contact
becoming active on the remote Model LE200.
N OTE : Should the data link between the two LE200s break, any active output contacts will deactivate.
Data Link Technology used with LE200 Line Extenders
The LE200 contains two different data link types for connecting line extenders. The connection scheme
of the line extenders determines which data link(s) should be used. The two data types are T1/E1 and
Low Voltage Differential Signaling (LVDS). It is possible to use both types at the same time to achieve
complex system architectures. Each data type, intended use, and the applicable switch settings are
described below.
T1/E1 Digital Link
The T1/E1 data link connection is the most common and is used when one pair of Model LE200s is
connected together. The T1/E1 carrier technology uses dedicated copper cable or fiber optic cable when
equipped with a T1/E1 fiber optic modem. The distance between line extenders determines the type of
connection needed. Copper wire connections require a 2-pair cable and will operate at up to 6000 feet
using No. 22 AWG wire. For distances greater than 6000 feet, a T1/E1 fiber optic modem and fiber optic
cable must be used.
N OTE : The Model LE200 is NOT designed for use with the public switched telephone network.
Low Voltage Differential Signaling (LVDS) Data Link
The LVDS data link connection is used to connect two or more LE200s located within 10 meters of each
other. The LVDS data link requires a straight-through shielded CAT5e cable between line extenders.
Each line extender contains an LVDS data “in” port and an LVDS data “out” port. The “out” port of the
first line extender to the “in” port of the next line extender. This connection scheme is repeated to link
multiple line extenders. Typically this connection scheme is used when multiple line extenders are
installed in a central location.
Setting up the Data Link(s)
The data links between line extenders must be configured using multiple DIP switch settings to determine
the clock source. Each LE200 must have exactly one clock source for its main processing logic. There
are three choices for the clock: an internal oscillator, a T1/E1 clock, or the LVDS “in” clock.
There are three possible choices for the source of this clock: the local Model LE200, the remote Model
LE200, or an external clock source on the T1/E1 link connecting two Model LE200s. If more than two
Model LE200s are connected using the T1/E1 data link and LVDS data link, then all must have their
clock derived from a single source.
An unused T1/E1 connection can be left open (not terminated).