IDM 300GP千兆网电话光端机

---

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

• "1000M Ethernet Telephone Optical Terminal"
• "Physically Isolated Gigabit Ethernet Telephone Optical Terminal"
• "300-Channel Telephone Optical Terminal"
  description: "The IDM-300GP Gigabit Ethernet Telephone Optical Terminal provides 2 physically isolated wire-speed 1000M Ethernet interfaces and 8 groups of transparent E1 interfaces. This equipment features a plug-in card structure design, with each service card providing 30 telephone channels. The device is easy to install and maintain."
  cover: "/images/imports/img-f842a1e5.webp"
  images:
• "/images/imports/img-f842a1e5.jpg"
• "/images/imports/img-6e45ad5f.jpg"
• "/images/imports/img-6de1d5ab.jpg"
  specs:
  "Transmission Distance": "20Km, optional long-distance optical modules are available for extended fiber transmission"
  keywords: "1000M Ethernet Telephone Optical Terminal, Physically Isolated Gigabit Ethernet Telephone Optical Terminal, 300-Channel Telephone Optical Terminal"
  slug: "idm-300gp-3"
  publishDate: "2026-05-12"

I. Overview

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

The IDM-300GP features 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 multiplexes narrowband and broadband services onto a 2.5G optical transmission channel, achieving both simplified transmission lines and cost savings. The equipment adopts a plug-in card structure design, with each service card providing 30 telephone channels. The device is easy to install and maintain.

It provides dual-fiber redundancy and can also be combined with other devices to form multiple physically isolated Ethernet point-to-point Telephone Optical Terminal networks, ring Telephone Optical Terminal networks, and point-to-multipoint star Telephone Optical Terminal networks.

        ![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 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, allowing customers to select based on their environment;

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

Ø Simple equipment installation and convenient maintenance.

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
Output Power	-12~-6dBm	Receiver Sensitivity	Better than-32dBm
Transmission Distance	20Km, long-distance optical modules can be optionally installed to achieve fiber transmission over longer distances

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	Operating Mode	Full/Half Duplex/Auto-Negotiation

FXO, FXS Interfaces

Audio Range	300Hz~3400Hz	Compression	A-law per ITU G.711
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	Balanced120Ω	Fully compliant withITU G.703 Recommendation

EM2/4-Wire Interface

Audio Frequency Range	300Hz~3400Hz	Impedance	Balanced600Ω
Compression Rate	A-law per ITU G.711	Return Loss	Not less than18dB

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