IDM 300GP电话光端机

---

title: "IDM 300GP Telephone Optical Terminal"
model: "IDM 300GP"
category: "Telephone Optical Terminal"
tags:

• "Multi-service Optical Terminal"
• "1000M Ethernet Telephone Optical Terminal"
• "Physically Isolated 1000M Ethernet Telephone Optical Terminal"
• "300-channel Telephone Optical Terminal"
  description: "The IDM-300GP multi-service optical terminal provides 2 physically isolated wire-speed 1000M Ethernet interfaces, 8 groups of transparent E1 interfaces, and FXO/FXS interfaces with Caller ID functionality, supporting up to 300 subscriber voice channels. The IDM-300GP multi-service optical terminal achieves both simplified transmission lines and cost savings. This device features a plug-in card structure design, with each service card providing 30 telephone channels, making installation easy and maintenance convenient."
  cover: "/images/imports/img-f842a1e5.webp"
  images:
• "/images/imports/img-f842a1e5.webp"
• "/images/imports/img-6e45ad5f.webp"
• "/images/imports/img-6de1d5ab.webp"
  specs:
  "Transmission Distance": "20Km, optional long-distance optical module available for extended fiber transmission"
  keywords: "multi-service optical terminal,1000M Ethernet telephone optical terminal,physically isolated 1000M Ethernet telephone optical terminal,300-channel telephone optical terminal"
  slug: "idm-300gp"
  publishDate: "2026-05-12"

I. Overview

The IDM-300GP Telephone Optical Terminal provides 2 physically isolated wire-speed 1000M Ethernet interfaces, 8 groups of transparent E1 interfaces, and FXO/FXS interfaces with Caller ID functionality, supporting a full configuration of 300 subscriber voice channels.

The IDM-300GP Telephone Optical Terminal provides 14 card slots, with 1+1 redundant power supplies, 10 service cards, and 2 main control cards. All card slots support hot-swapping.

The IDM-300GP Telephone Optical Terminal multiplexes narrowband and broadband services onto a 2.5G optical transmission channel, achieving both simplified transmission lines and cost savings. This device features a plug-in card structure design, with each service card providing 30 telephone channels, making installation easy and maintenance convenient.

        ![Figure 1 IDM 300GP Front and Rear Panel Diagram](/images/imports/img-f842a1e5.webp)            ![IDM 300GP<a href=/product/ target=_blank class=infotextkey>Telephone Optical Terminal</a>01.jpg](/images/imports/img-6e45ad5f.webp)

Figure 1 IDM 300GP Front and Rear Panel Diagram

II. Product Features

Ø Optical line rate of 2.5Gbps;

Ø 1 CMU central control and management card, 10 user card slots, each user interface card supports 30 channels of 64K telephone audio services, with a maximum user interface capacity of 300 channels;

Ø 2 physically isolated wire-speed 1000M auto-negotiation Ethernet interfaces;

Ø 8 groups of transparent E1 interfaces, 4 groups in 75-ohm unbalanced mode and 4 groups in 120-ohm balanced mode, facilitating customer selection based on the environment;

Ø The entire unit features a centralized chassis design, standard 6U chassis, compliant with telecommunications and carrier standards;

Ø The optical terminal equipment is easy to install and convenient to maintain.

III. Technical Specifications

Optical Interface

Interface Type	SFP	Fiber Mode	Single-mode (Multi-mode optional)
TX/RX Rate	2.5Gbps	TX/RX Wavelength	1310nm/1550nm
TX Optical Power	-12~-6dBm	RX Sensitivity	Better than-32dBm
Transmission Distance	20Km; long-distance optical modules can be optionally installed for extended fiber transmission

E1 Interface

Line Rate	2.048Mbps	Line Code	HDB3
Standard Protocol	SupportsITU-T G.703	Impedance	75Ω/120Ω
Frame Structure	PCM30/32	Signaling	Channel-Associated Signaling

Ethernet

Interface Type	RJ-45	Transmission Rate	10M/100M/1000M
Standard Protocol	SupportsIEEE802.3	Operation Mode	Full/Half Duplex/Auto-Negotiation

FXO, FXS Interfaces

Audio Range	300Hz~3400Hz	Compression	ITU G.711 A-law
Impedance	Triple complex impedance 200Ω+560Ω//0.1μF	Loop Current	20mA/channel

Co-directional 64K Interface

Line Code	G.703 Standard	Line Rate	64Kbps
Impedance	Balanced 120Ω	Fully compliant with ITU G.703 Recommendation

EM2/4-Wire Interface

Audio Range	300Hz~3400Hz	Impedance	Balanced600Ω
Compression Ratio	ITU G.711A-law	Return Loss	≥18dB

V.24 Interface

Transmission Rate

Asynchronous ≤9600bps; Synchronous 64Kbps

Electrical Characteristics

Compliant with CCITT V.28 protocol

V.35 Interface

Interface Type	RJ-45	Electrical Characteristics	Compliant withITU-T V.35Recommendation
Transmission Rate	n×64Kbps（n=0～31）	Terminal Interface	Compliant withISO2593Specification

Power Supply and Power Consumption

Power Supply

AC220V/DC-48V

Power Consumption

≤90W

Environmental Conditions

Operating Temperature

-10oC ~+50oC

Relative Humidity

0~95% (non-condensing)

Product Dimensions

Length×Depth×Height

482×266×270 (mm)

IV. Application Example 1