I. Overview

The IDM GTD442 dual gigabit telephone optical terminal is a new-generation optoelectronic integrated transmission device developed by our company, based on high-speed fiber transmission technology and PCM technology. It integrates Ethernet transmission and PCM multi-service access functions, meeting the diverse requirements of users for broadband and narrowband multi-service fiber transmission and access.

The IDM GTD442 is a fiber access device with multiple configurations. It provides fiber multiplexing for Ethernet, telephone, and serial interfaces, and can interoperate with the IDM GP2000 series optical interface devices.

The IDM GTD442 features a fiber interface rate of 2.5G, providing 2 wire-speed 1000M Ethernet channels, each equipped with 1 electrical port (GE) and 1 optical port (GX); it also provides 18 E1 bandwidth transmission channels.

The IDM GTD442 supports up to two groups of fiber interfaces on the line transmission interface, forming redundant optical ports, or chain networks, ring networks, etc.

On the user interface, it provides 4 groups of Ethernet interfaces, 4 telephone channels (central office, remote, magneto, 2-wire audio), 2 RS485 channels or 1 RS422 channel. The Ethernet interfaces can be configured in physical isolation or VLAN isolation modes.

At the central office end, it can interconnect with GP2000 and GP2400 optical modules, through which devices such as IDM G3CP, IDM OMP, IDM 30E, IDM 30F, and IDM GP-MPconv can be connected.

It can be widely applied in private networks such as public security, electric power, railway, and mining, as well as public network fields including mobile, Unicom, and telecom operators.

II. Device Operating Principle

III. Product Features

• Dual physically isolated wire-speed 1000M Ethernet channels;
• Provides 4 telephone interface channels, configurable as FXO central office automatic telephones, FXS remote automatic telephones, or MAG magneto telephones;
• 2 optional RS485 data channels;
• Optical ports are SFP interfaces, allowing optical modules to be configured as required;
• Can be customized as dual optical ports to form chain networks.

IV. Single Optical Port Device Functions and Applications

Functions

• Point-to-point general-purpose telephone optical terminal diagram
• Point-to-point magneto telephone optical terminal

Applications:

• Fiber to the office, with physical isolation between internal and external networks;
• Public security checkpoint information point construction;
• Community and factory information point construction.

V. Dual Optical Port Device Functions and Applications

Functions

• Dual optical port chain network telephone optical terminal interface annotation diagram
• Chain network topology diagram with IDM GP2400-30E

Applications:

• Tunnel construction applications;
• River monitoring and management;
• Community information point construction.

VI. Technical Specifications

1) Optical Interface

Interface Type	FC	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-18dBm
Transmission Distance	20Km, long-distance optical modules can be optionally installed to achieve fiber transmission over longer distances

2) Ethernet

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

3) FXO, FXS Interfaces

Audio Range	300Hz~3400Hz	Compression	A-law per ITU G.711
Impedance	Triple complex impedance200Ω+560Ω//0.1μF	Loop Current	20mA/channel

4) Power Supply and Power Consumption

Power Supply Mode

AC220V/DC- 48V

Total Power Consumption

≤90W

5) Environmental Conditions

Operating Temperature

-10oC ~+50oC

Relative Humidity

0~95% (non-condensing)

6) Product Dimensions

Length×Depth×Height

××(mm)

VII. Application Examples