IDM 300GP Gigabit Network Telephone Optical Multiplexer

IDM 300GP|PDH·📅UpdatedMay 12, 2026·✍️管理员

The IDM-300GP Gigabit Network Telephone Optical Multiplexer provides 2 physically isolated wire-speed 1000M Ethernet interfaces and 8 groups of transparently transmitted E1 interfaces. The device features a plug-in card structure design, with each service card providing 30 telephone lines. The equipment is easy to install and maintain.

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I. Overview

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

The IDM-300GP 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 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 equipment is easy to install and maintain.

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

Figure 1 IDM 300GP front and rear panel diagram IDM 300GP<a href=/product/ target=_blank class=infotextkey>Telephone Optical Terminal</a>01.jpg

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, for customer selection based on environment;

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

Ø Easy 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
Optical Output Power	-12~-6dBm	Receiver Sensitivity	Better than-32dBm
Transmission Distance	20Km, optional long-distance optical module available 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	Operating Mode	Full/Half Duplex/Auto-Negotiation

FXO, FXS Interfaces

Audio Range	300Hz~3400Hz	Compression	A-law per ITU G.711
Impedance	Three-element 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 Frequency Range	300Hz~3400Hz	Impedance	Balanced600Ω
Companding Law	A-law per ITU G.711	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