GAI-Tronics LE200, LE200-FSR, LE200-FLR Page/Party Line Extenders - Manual (Page 29)

Pub. 42004-701L2F
M ODEL LE200 S ERIES W ALL -M OUNT P AGE /P ARTY
®
L INE E XTENDERS P AGE 27 of 50
f:\standard ioms - current release\42004 instr. manuals\42004-701l2f.doc
04/09
Headers P20 and P21 control the grounding of the T1/E1 lines. Grounding the T1/E1 lines may reduce
emissions if that is an installation concern.
Table 31. T1/E1 Line Grounding on 69443-xxx PCBA
Header Shorting Clip Grounding Condition
P20 1-2* T1/E1 Rx line floating.
2-3 T1/E1 Rx line grounded.
Removed T1/E1 Rx line floating.
P21 1-2* T1/E1 Tx line floating.
2-3 T1/E1 Tx line grounded.
Removed T1/E1 Tx line floating.
*Indicates default position.
NOTE
Do not connect the T1/E1 transmit signal to the T1/E1 receive signal on the same
Model LE200. Doing so creates a feedback path that usually results in extremely loud oscillations
on the page line and the party lines. The contact outputs may also activate.
NOTE
Do not ground the T1/E1 lines at both ends. Doing so will create a ground loop.
An unused T1 connection can be left open (not terminated).