IDM 300GP Gigabit Network Telephone Optical Multiplexer
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.
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
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 |
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
