Description
PDH series optical multiplexer are the small and medium-capacity fiber optical transmission and access equipments developed and manufactured independently by Our company, which apply the latest technology and professional super-sized programmable integrate circuit, and provide multiplexing and demultiplexing and optical-electric transmission of 1E1/4E1/8E1/16E1 digital signals. The rich bit overhead provides not only various capacities of main channel business transmission, such as E1/G.703 interface, V.35 based on 2048kbit/s and 10Base-T interface, but also V.24 low rate data channel and engineering order wire channel.
PDH series optical multiplexer have the remote loop-back function of 2M data ports, facilitating the test and fault positioning. They have perfect fault self-diagnosing function, provide optical transmission link alarm, 2Mbit/s interface alarm and audible alarm.
The equipment uses 1B1H line code, and supports dual-fiber bi-directional transmitting and signal-fiber bi-directional transmitting, several types are available to meet different requirements. The equipment is suitable for point to point optical transmission line, able to provide public and private networks with high-quality, flexible and reliable optical transmission digital line.
The multiplexer is high in integration, strong in reliability, low in power consumption, small in size and overall in function. Even in severe environment, the equipment is still stable. The whole equipment requires no adjustment during installation. It is convenient in use and simple in maintenance.

Features
◆ FHC4480 is 1U19” Framework optical transmitter and receiver
◆ FHC4480 provide G.703 interface
◆ Transmission distance >40Km(LED) or 70Km(LD)
◆ End-to-end brand-path loop-back control function
◆ Provide service telephone, easy maintenance
◆ Perfect work status and alarm status display, can display alarm status and work statue of local equipment and remote equipment.
◆ Provide acoustic-optic alarm message, easy maintenance
◆ Optional with dual optical fiber and two-way transmission and single optical fiber and two-way transmission machine types, high reliability, and easy installation.
Specification
Optical interface features
optical fiber type SM optical fiber：8.3/125、8.7/125、9/125、10/125
Fiber optical wavelength………..1310nm
Fiber optical interface…………..FC/PC active connector
Line code………………………1B1H code
Line code speed………………16.896Mb/s，33.792Mb/s，42.24Mb/s
Sending light power……………>-12dBm
Receiving sensitivity…………..<-38dBm(BER≤10¯¹º)
Light source……………….…….LED light source/LD laser
Light receiver……………………PINFET
Adopt optical receiving and sending unite module
E1 interface features
Interface code pattern: HDB3 code
Line rate……………………………2048Mb/s
Error tolerance range…………….±50ppm
Interface feature…………………. ITU-T G7.03
Interface impedance……………..75Ω/ imbalance
Physical interface…………………SMB/BNC coaxial plug