Multi-Tech Systems ISIHP-4U, ISIHP-4SD manual ISIHP-2U LED Indicators

Hardware Installation

ISIHP-2U LED Indicators

DP LINE 1

DP LINE 2

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.

18 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD