Optical fiber and E 1 double UpLink PCM transmission equipment

A: Overview

Comprehensive business PCM equipment is a large-scale integrated circuit that our company adopts independent intellectual property rights. Using time division multiplexing technology, it transmits Ethernet signal and E1 signal on a pair of optical fiber. Realize the hybrid transmission of 100 megabytes of Ethernet, E1 interface, ordinary telephone, magnet phone, RS232 / RS485 / RS422 data service, the transmission channel is the optical transmission channel, the device provides 2 SFP optical ports, support 1 + 1 optical line protection;

The device supports E1, and automatically transmits through E1 when the fiber fails.

The machine adopts a 19-inch, 1U frame design, high integration, small volume, low power consumption, reliable work, easy installation and use.

Two: the main functions and characteristics

When light transmission:

Provide 2 SFP optical interfaces (optical port rate 1.25G), optical interface 1 + 1 protection;

Provide 8-road physical isolation line speed 10 / 100M adaptive Ethernet port, full-duplex / half-duplex adaptive;

Provide 8-road E1 service ports, full digital clock recovery and smooth phase locking technology;

Provide 30 programmed phone calls

When E1 is transmitted:

Provide E1 upper connection function, and automatically change to E1 channel transmission when fiber failure

Provide 1 + 1 protection on E1 (7 and 8 E1 mutual backup)

Provide 30 programmed phone calls

Provide one-road Ethernet interface (N * 64K, N 30), idle phone bandwidth automatically allocated to Ethernet data

Power-supply is DC-48V or AC 220V, etc.;

Provide perfect end-to / end-to-end alarm monitoring;

Three: technical indicators

1: Optical interface (1.25G)

Wavelength: 1310nm (standard model) or 1550nm

Transmission power: -12 dBm

Receiving sensitivity: -30 dBm (BER 10^-11)

Interface mode: LC

Transmission mode: double fiber or single fiber

2: E1 interface

The equipment has an 8-channel E-1 interface, in line with the G.703 Suggestions

Rate: 2,048 Kb/s ±, 50ppm

Code type: HDB 3

Impedance: 75 Ω (nonequilibrium) or 120 Ω (equilibrium)

Jitter: as per G.742  G.823 Suggestions

Allow attenuation of the input port: 0~6dB

3: Ethernet interface

Support line speed 10Base-T / 100Base-T, full duplex / half duplex adaptation

Compliance the IEEE802.3/IEEE802.3u criteria

Standard RJ 45 plug was used

4: Data interface (including RS232, RS485, RS422 interface)

The data interface rate is 300--19.2Kbit/s baud rate adaptive, DCE mode

5: Channel interface and signaling

Exchange side

Unpick impedance: <500 Ω

Hang-up impedance:> 10K Ω

The user side

Ring Road impedance: 2000 Ω (including the phone)

Idle circuit voltage ≤ 50V

Loop current: 25 mA

Unpick gate limit: 8 mA

Polarity reversal delay: <50ms

dial: Pulse dial single pulse distortion <5ms

The total distortion of the in-band audio dial meets the voice interface characteristics

Lift delay: < 100ms

ringing current:

Distal (FXS) bell flow generator

frequency: 25 H z ±3 H z

range: 75V±5V rms

Bell flow delay < 50ms

Total output power 10W (in chassis)

Bureau-end (FXO) bell flow detection

amplitude range: Minimum of 38 Vrms

Typical applications：