This series of PDH Optical Multiplexers is a point-to-point optical transmission equipment developed by our company, based on independently researched Ultra Large Scale Integrated Circuits specifically designed for fiber optic transmission.

The device provides 1 to 4 E1 interfaces and an optional 1-channel digital engineering order-wire (EOW), offering extremely flexible application configuration.

The equipment features comprehensive alarm functionality, ensuring stable and reliable operation. It is characterized by low power consumption, high integration, and compact size.

1. Core Technology: Utilizes proprietary intellectual property (IP) high-performance integrated circuits.
2. High-Performance Optical Detection: Employs a modular wide-dynamic-range optical detector to ensure signal sensitivity and stability.
3. E1 Interface Standard: The E1 interface fully complies with ITU-T G.703 recommendations, featuring built-in all-digital clock recovery and smooth phase-locked loop (PLL) technology.
4. Engineering Communication: Optional 1-channel PCM digital engineering order-wire (EOW) for convenient site maintenance.
5. Intelligent Alarm Detection: Able to detect whether the loss of optical signal is due to remote equipment power-off or a fiber fault, with LED indicators for alarm status.
6. Remote Monitoring: Features the ability to view and display the operating status of the remote equipment from the local end.
7. Maintenance Functionality: Supports command remote interface loopback, facilitating efficient line commissioning and troubleshooting.
8. Long-Distance Transmission: Supports extended transmission ranges, with a non-relay transmission distance of 2 to 120 km.
9. Multiple Power Options: Offers various power supply modes, including AC220V, DC-48V, or DC+24V.
10. Power Polarity Protection: DC-48V/DC+24V power supplies feature automatic polarity detection, eliminating the need to distinguish polarity during installation.

◆ Optical Interface

Optical Port	1
Fiber Type	Single-fiber or Dual-fiber
Interface Type	FC/SC/ST/LC (SFP)
Wavelength	Multi-mode: 850nm/1310nm Single-mode: 1310nm/1550nm
Non-relay Transmission Distance	20km ~ 120km
Typical Transmit Power	Single-mode 1310/1550nm: ≥-9dBm Multi-mode 850nm: -18dBm Multi-mode 1310nm: -25dBm
Receiver Sensitivity Range	-28dBm to -40dBm

◆ E1 Interface

Standard	Complies with ITU-T G.703 recommendations
Rate	2048Kb/s ± 50ppm
Code Pattern	HDB3
Impedance	Unbalanced 75Ω / Balanced 120Ω Note: Unbalanced interfaces are equipped with coaxial adapters for 75-2/3 cables.
Jitter Performance	Complies with ITU-T G.742 and G.823 recommendations
Input Tolerance	0 ~ 6dBm

◆ FXS Engineering Order-Wire (EOW) Interface

Ringing Voltage	75V
Ringing Frequency	25Hz
Two-wire Input Impedance	600Ω (Off-hook)
Return Loss:	20dB

◆ Electrical & Mechanical Characteristics

System Power Supply	AC 180V ~ 260V; DC -48V; DC +24V
Power Consumption	≤10W
Dimensions	216 (L) x 140 (W) x 31 (H) mm (Desktop, 120Ω) 216 (L) x 140 (W) x 41 (H) mm (Desktop, 75Ω)

◆ Environmental Index

Operating Temperature	−10∘C∼+60∘C
Storage Temperature	−40∘C∼+85∘C
Operating Humidity	0%∼95% (Non-condensing)
MTBF (Mean Time Between Failures)	>100,000 hours

4e1 pdh multiplexer (desktop)

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4E1 PDH Multiplexer (Desktop)

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