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1. Overview

1.1 Function Description

Our fiber optical multiplexer can multiplex to 4 E1 signals for transmission and long wavelength digital transmission receiving over an optical fiber, resulting in reaching a longer distance without a repeaters and superior performance compared to copper media.

 

4E1 fiber optical multiplexer is the 4E1 point-to-point optical transport equipment that uses the FPGA chips and it is easy to upgrade. It is single board structure and the largest transmission capacity is 4E1. The outer design use the standard 19 inches rack, so the volume is little, weight is light and operation is convenient and credit.

 

4E1 fiber Multiplexer adopts the PDH fiber transmission technologies. The 2M (E1) interfaces can connect with the exchanger, light loop device and multi-diplexer directly to form a special network. Complete alarm function for 4E1 fiber optical multiplexer, it is stable and easy to maintenance, install and small in size. It has one digital service telephone.

 

1.2 Features

the features for 4E1 fiber optical multiplexer:

• Offer 4 × 2Mb/s digital interfaces
•  Up to 4 E1 links on one fiber
•  Management through Console port
• The supervisory control interface implements centralized monitoring and export the monitor and control information of this port and opposite port.
• One link to service telephone for duty contract
• 175-260VAC & -48VDC power options and the positive and negative of DC-48V can be optional because there is the self-test circuit for the polarity inside th1e device
• Standard 19/9.5 inches rack, little volume, light weight, steady capacity and convenient setup
• Digital clock recovery circuit and digital smooth DPLL adopted for 2.048Mb/s port
• LED indicators 

 

1.3 Application

4E1 fiber optical multiplexer can be used a high-speed baseband modem for point to point that connects two DTE over a lease Line. From Router à CSU/DSU à 4E1 fiber optical multiplexer à Fiber opticalà 4E1 fiber optical multiplexerà CSU/DSUà DTE as illustrated in the Following Diagram. 

Diagram 1.1

1.4 Specification 

E1 line Interface 

Number of E1	4E1	Interface standard	ITU-T G.703
Line Rate	2.048Mbps±50ppm	E1 Impedance	120 (banlance)
Line Code HDB3	HDB3	Connector Type	RJ45
Jitter tolerance	Fine than G.742, G.823

 

Optical Fiber Interface 

Wavelength	1310 or 1550 ±50/40nm	Connector Type	FC/SC
Light Source	MLM Laser	Detector PIN	Photodiode
System Gain	26 dB (minimum)	Input Sensitivity	-38dBm(Ber<10e-10)
Line Code	Scrambled NRZ

 

      Note: Longer or shorter distance 50km or above (120km) , on special order

 

Physical/Electrical 

	Dimension
FMO-120-19"	44mm/1.7 in (1U) (height), 485mm/19 in (width), 160mm/6.3 in (depth)
FMO-120-9.5"	30mm/1.2 in (1U) (height), 222mm/8.7 in (width), 160mm/6.3 in (depth)
Mounting	standalone, 19" and 9.5" inch rack mount, wall mount also available
Power source	AC 100-240V (50/60HZ) or DC ±48V (DC -36 to -72V)
Power consumption	<5w
Temperature range	0~55℃ (32 to 122 F)
Relative Humidity	0~90%, non-condensing