
20 MultiModemISI Hybrid Series, ISIHI-2S/2U
Chapter 2—Hardware Installation
LED Indicators
The mounting bracket for both the ISIHI-2S and the ISIHI-2U is similar, except the LEDs
are labeled differently. Each mounting bracket has two sets of LED indicators that
indicate status and line activity. Below, and on the next page, are graphics for each
bracket along with descriptions of the LED indicators.
ISIHI-2S LED Indicators
B1 LED Indicator
When lit, indicates active data or voice connection on B-channel 1.
B2 LED Indicator
When lit, indicates active data or voice connection on B-channel 2.
I
O
A
D
D
R
LINE 1
LINE 2
B1 B2
B1 B2
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