Multi-tech-systems ISIHP-2U Manual de usuario Pagina 18

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18 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
Hardware Installation
ISIHP-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 ISIHP-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.
LINE 2
P
D
D
LINE 1
P
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