Owner`s manual

10 MultiModemISI Hybrid Series, ISIHI-2S/2U
Hardware Installation
ISIHI-2U LED Indicators
P LED Indicator
 Indicates U interface status connection.
 Controlled by NT-1, which converts S/T interface
(4-wire ISDN) to U interface (2-wire ISDN).
 When U interface and S/T interface are NOT
active, LED remains off.
 Flashes 8 times/second (8 Hz)U interface is
attempting to activate.
 Flashes once/second (1 Hz)U interface is active;
S/T interface is not fully active.
 Lit, not flashingBoth U and S/T interfaces are
active.
D LED Indicator
 Lights when the ISIHI-2S/2U is turned on.
 Flashes until SPIDs are verified with the central
office switch; then remains lit without flashing.
 Indicates data link layer status.
The settings of the multiple DIP switch unit on the
mounting bracket determine the base Input/Output
address for the ISIHI-2S/2U card. Input/Output
(I/O) addresses are used to route information to
and from the card.
I
O
A
D
D
R
LINE 1
LINE 2
PD
PD
8
7
6
5
4
3
2
1