Product Overview

The 16-Channel PCM Voice Multiplexer over E1 is a high-reliability voice transmission device designed for point-to-point communication across E1 channels. Developed based on a proprietary VLSI (Very-Large-Scale Integration) chipset, this equipment supports 16 voice channels over a standard 2048Kbps G.703-compliant E1 link, making it ideal for telecom operators, power utilities, transportation hubs, and enterprise private networks.

Available in a 19-inch 1U rackmount structure, it provides flexible FXO/FXS interface options, low power consumption, and robust environmental adaptability. It is especially suitable for applications where legacy analog voice systems need to be extended over digital TDM infrastructure.

Key Features

• ✅ 16 voice channels (FXO/FXS) with support for caller ID, fax, and polarity reversal billing.

• ✅ Full digital circuit design, stable and low-power operation with MTBF > 100,000 hours.

• ✅ Compatible with G.703 standard and supports HDB3 encoding for E1 interface.

• ✅ E1 signal loss detection with alarm indicator for remote or local fault detection.

• ✅ FXO connects to PBX or PSTN trunks; FXS connects to analog phones or fax machines.

• ✅ Supports flexible power options: AC 220V, DC -48V, or DC +24V with polarity auto-detection.

• ✅ Optional optical fiber interface: supports single-mode or multi-mode fiber up to 20km or customizable distances.

• ✅ Supports mutual number assignment (dialing plan) between endpoints.

• ✅ Compact 1U rackmount design (485 × 138 × 45 mm), easy installation and maintenance.

Technical Specifications

➤ E1 Interface

• Standard: Complies with ITU-T G.703

• Bitrate: 2048 Kbps ±50ppm

• Encoding: HDB3

• Impedance: 75Ω unbalanced / 120Ω balanced

• Input attenuation tolerance: 0–6 dBm

• Jitter compliance: G.742, G.823 standards

➤ Voice Ports (FXO/FXS)

FXS (User Side):

• Ringing voltage: 75V

• Ringing frequency: 25Hz

• Impedance: 600Ω

• Return loss: ≥20dB

FXO (Trunk Side):

• Ring detection voltage: ≥35V

• Frequency range: 17–60Hz

• Impedance: 600Ω

• Return loss: ≥20dB

➤ Fiber Optic Interface (Optional)

Multi-mode Fiber:

• Core size: 50/125µm or 62.5/125µm

• Distance: Up to 2km

• Wavelength: 850nm

• TX Power: -12 ~ -9dBm

• RX Sensitivity: ≤ -28dBm

Single-mode Fiber:

• Core size: 8/125µm or 9/125µm

• Distance: 20km (or up to 80~120km via customization)

• Wavelength: 1310nm (1550nm optional for long-distance)

• TX Power: -9 ~ -5dBm

• RX Sensitivity: ≤ -27dBm

➤ Power & Physical

• Power Supply: AC 180V ~ 260V, DC -48V, DC +24V

• Power Consumption: ≤ 5W

• Form Factor: 1U 19” rackmount

• Dimensions: 485 × 138 × 45 mm

➤ Environmental

• Operating Temperature: -10°C ~ +60°C

• Storage Temperature: -40°C ~ +85°C

• Humidity: 0–95% RH (non-condensing)

• MTBF: >100,000 hours