IDM-NT008

Telephone Optical Multiplexer·📅UpdatedMay 12, 2026·✍️管理员

The IDM-NT008 Desktop 8-Channel Multi-Service Optical Multiplexer provides 8 telephone interfaces through 1 optical fiber channel. The 8-channel telephone optical multiplexer features high integration and compact size. It extends voice and data services to various user areas, enabling cross-boundary number assignment, serving as a substitute for remote small exchanges, and postponing the construction of switching offices. Alternatively, in urban areas, it overcomes the limitations of twisted pair in terms of frequency band and transmission distance, expanding the service range of switching offices.

8-channel telephone optical multiplexerdesktop telephone optical multiplexer8-channel telephone optical multiplexer price8-channel telephone optical multiplexer manufacturerprofessional communication equipment manufacturer: Beijing Ruiguang Jiyuan Digital Technology Co., Ltd.

Overview:

The IDM-NT008 integrated service fiber access device is one of the integrated service transmission multiplexing devices designed by our company using dedicated large-scale integrated circuits. The IDM-NT008 telephone optical terminal connects user terminal equipment or user terminal equipment to the public switched telephone network through fiber optic transmission media.

The IDM-NT008 telephone optical terminal extends voice and data services to various subscriber areas, enabling cross-boundary number assignment, serving as a substitute for remote small exchanges, and deferring the construction of switching offices. Alternatively, it resolves the limitations of twisted pair in bandwidth and transmission distance within urban areas, expanding the service coverage of switching offices.

Indicator light description 8-channel <a href=/product/ target=_blank class=infotextkey>telephone optical terminal</a> rear.jpg

Indicator light description

Indicator Name	Definition	Status Description
1	Channel 1 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
2	Channel 2 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
3	Channel 3 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
4	Channel 4 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
5	Channel 5 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
6	Channel 6 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
7	Channel 7 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
8/ALM	Channel 8 Telephone Indicator	Steady ON: Telephone in use; Blinking: Ringing; OFF: Channel idle
8/ALM	Fiber Optic Alarm	Blinking: Fiber optic alarm; Normal operation: OFF

Table 1-1

Telephone Interface Pin Assignment

Interface	8P8C RJ45 Pin	Definition
P1-P4	4 5	Channel 1
P1-P4	3 6	Channel 2

Table 1-2

FXO, FXS Interfaces

Audio Range	300Hz–3400Hz	Compression	ITU G.711 A-law
Impedance	Triple compound impedance 200Ω+560Ω//0.1μF	Loop Current	25mA/channel

Fiber Connection

The fiber access ports of the telephone optical transceiver are designated as TX and RX. There are three interface types available. Please specify the connector type in your order based on the fiber cable connector used. If no special requirement is indicated, FC connectors are configured by default. The standard transmission distance is 30–40 km.

Connect TX to the remote end's RX, and RX to the remote end's TX. When the remote device is powered on and the fiber link is properly connected, the 8/ALM green LED on the device remains off. If the 8/ALM indicator flashes, it indicates a fiber link fault — please re-check the fiber connections.

Telephone Not Working

Check whether the local and remote devices are installed correctly — the local (central office) unit connects to the PBX/switch, and the remote unit connects to the telephone set.
Check whether the wiring sequence of the service interface is correct.
Check the fiber link — the 8/ALM indicators on both ends should remain steadily off to confirm the fiber link is normal.
Check whether the telephone set itself is functioning properly.