IDM-120N 128路电话光端机

---

title: "IDM-120N 128-Channel Telephone Optical Terminal"
model: "IDM-120N"
category: "Telephone Optical Terminal"
tags: [
"128-channel telephone optical terminal",
"128-channel telephone optical terminal price",
"128-channel telephone optical terminal manufacturer",
"Plug-in card telephone optical terminal",
"128-channel rack-mounted telephone optical terminal"
]
description: "The IDM-120N 128-channel multi-service optical terminal is a PCM integrated service fiber transmission device designed with dedicated large-scale integrated circuits. It provides a total optical fiber transmission bandwidth of 155M, offering 2 shared wire-speed 100M Ethernet interfaces, 4 groups of E1 transparent transmission interfaces, and 128 telephone subscriber channels. The IDM-120N 128-channel multi-service optical terminal also features dual backup and hot-swappable power supply units and ringing generator units, greatly ensuring the reliability of service transmission.",
cover: "/images/imports/img-4b7ad07e.webp",
images: [
"/images/imports/img-4b7ad07e.webp",
"/images/imports/img-153d1101.webp",
"/images/imports/img-c045d83f.webp"
],
keywords: "128-channel telephone optical terminal,128-channel telephone optical terminal price,128-channel telephone optical terminal manufacturer,plug-in card telephone optical terminal,128-channel rack-mounted telephone optical terminal",
slug: "idm-120n-128ldhgdj",
publishDate: "2026-05-12"
}

Overview:

The IDM-120N integrated service cross-connect multiplexing device is a PCM integrated service fiber transmission system designed by our company using dedicated large-scale integrated circuits. It provides a total optical fiber transmission bandwidth of 155M, offering 2 shared wire-speed 100M Ethernet interfaces, 4 groups of E1 transparent transmission interfaces, and 128 telephone subscriber channels. The E1 transmission channels comply with the G.703 standard and adopt the PCM30/31 format; FXO and FXS support polarity reversal and caller ID functions. The 128-channel telephone optical terminal also features dual backup and hot-swappable power supply units and ringing generator units, greatly ensuring the reliability of service transmission. The 128-channel telephone optical terminal can be widely applied in telecom and Netcom public telephone network services, as well as private line information and data services for power, banking, public security, and military sectors.

Product Features:

• 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;
• Complete function control switches and alarm indication features;
• Comprehensive and user-friendly network management functions, supporting 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 optical interface access. 2 wire-speed 100M Ethernet interfaces, 4 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 and ring voltage card	RPRU-120	Provides 1+1 power supply, powering the entire unit and providing ring voltage. For FXS side, -48V input	2
6	FXO service card	8FXO-120	8 FXO interfaces, switch side	16
7	FXS service card	8FXS-120	8 FXS interfaces, subscriber side	16

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

Technical Specifications:

Optical Interface

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

E1 Interface

Bit Rate	2048Kbps	Line Code	HDB3
Standard Protocol	Supports ITU-T G.703	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	Supports IEEE802.3	Operating Mode	Full/Half Duplex/Auto-Negotiation

FXO/FXS Interface

Audio Range	300Hz~3400Hz	Impedance	Three-element complex impedance 200Ω+560Ω//0.1μF
Compression Rate	ITU G.711 A-law	Loop Current	25mA/channel

Power Supply and Consumption

Power Supply

DC- 48V orAC 220V

Power Consumption

≤250W

Environmental Conditions

Operating Temperature

0°C ~+40oC

Humidity

95% non-condensing

Product Dimensions

Length×Depth×Height

480×200×132(mm)

Application Example: