IDM-120N Telephone Optical Terminal 8-120 Channel Telephone Optical Terminal

IDM-120N|Telephone Optical Terminal·📅UpdatedMay 12, 2026·✍️管理员

The IDM-120N multi-service optical terminal adopts a 19-inch 3U standard chassis; its total optical fiber transmission bandwidth is 155M, providing 2 shared wire-speed 100M Ethernet interfaces, 4 groups of E1 transmission interfaces, and 120 telephone subscriber channels; the IDM-120N multi-service optical terminal provides 16 subscriber interface slots; reserved multi-function card slots for flexible expansion, supporting any network topology;

Overview:

The IDM-120N multi-service optical terminal is a PCM integrated service optical fiber transmission device designed by our company using dedicated large-scale integrated circuits. Its total optical fiber transmission bandwidth is 155M, providing 2 shared wire-speed 100M Ethernet interfaces, 4 groups of E1 transparent transmission interfaces, and 120 telephone subscriber channels. The E1 transmission channels comply with the G.703 standard and adopt the PCM30/31 format; FXO and FXS can provide polarity reversal and caller ID functions. This device also features dual backup and hot-swap capabilities for the power supply unit and ring generator unit, greatly ensuring the reliability of service transmission. The IDM-120N telephone optical terminal can be widely applied in telecom and China Netcom public telephone network services, as well as private line information and data services for electric power, banking, public security, and military sectors.

Product Features: IDM-120N Telephone Optical Terminal 8-120 Channel Telephone Optical Terminal - Figure 2

Product Features:

Adopts a 19-inch 3U standard chassis for easy installation.

4 groups of E1 transmission interfaces;

2 channels of shared wire-speed 100M Ethernet;

Provides 16 subscriber interface slots;

Reserved multi-function card slots for flexible expansion, supporting any network topology;

Equipped with comprehensive function control switches and alarm indication functions;

Features concise and comprehensive network management functions, enabling online real-time configuration, query, and fault statistics management of the device;

Configuration Table:

No.	Name	Model	Description	Qty
1	Equipment Chassis Backplane	IDM-120	19-inch 3U chassis, providing 19 card slots	1
2	E1 Interface Main Control Card	CMU-E1-120	Provides E1 interface access	1
3	Optical Interface Main Control Card	CMU-120	Provides 1 group of optical interface access. 2 groups of wire-speed 100M Ethernet interfaces, 4 groups of E1 interfaces	1
4	Power Supply Card	PRU-120	Provides 1+1 power supply for the entire unit. For FXO side, -48V input	2
5	Power Supply & Ring Generator Card	RPRU-120	Provides 1+1 power supply, entire unit power supply and ringing voltage. For FXS side, -48V input	2
6	FXO Service Card	8FXO-120	8 FXO interfaces, exchange side	16
7	FXS Service Card	8FXS-120	8 FXS interfaces, subscriber side	16

In a single unit configuration, only one of Item 2 and Item 3 can be selected;

Technical Specifications:

Optical Interface

Connector Type	FC (SC etc. customizable)	Fiber Mode	Single-mode (multi-mode optional)
Fiber Rate	155Mbps±50ppm	Wavelength	1310nm
Transmit Power	-2～-11dBm	Receiver Sensitivity	Better than -36dBm

E1****Interface

Bit Rate	2048Kbps	Line Code	HDB3
Standard Protocol	ITU-T G.703 compliant	Impedance	75Ω/120Ω
Frame Structure	PCM30/31	Signaling	Channel-associated signaling

Ethernet

Interface Type	RJ-45	Transmission Rate	10/100Base-T 10M/100M
Standard Protocol	IEEE802.3 compliant	Operating Mode	Full/Half duplex/Auto-negotiation