Security Communication System of Jinan Rail Transit Line 4

I. Project Background

The 4th Line of Jinan Rail Transit (with a total length of approximately 40.2 km and 33 stations) needs to establish a highly reliable communication network between stations and the control center. The requirements are as follows:

Simultaneously transmit 1080P surveillance video, broadcast audio, and emergency intercom signals

Satisfy the tunnel environment with severe electromagnetic interference (contact wire voltage 1500V)

Comply with the "GB/T 7424-2008" standard for rail transit optical cables

II. Solution

The optical transceiver for rail transit developed by our company is adopted. The highlights are as follows:

Customized design

Deploy 2 19-inch rack-mounted optical transceivers at each station (with hot backup for primary and secondary)

Support mixed transmission of 8 video channels + 16 audio channels + 4 E1 channels

Built-in surge protection module (impact withstand voltage ≥ 6kV)

III. Implementation Results

Key Indicators

PQS score for video transmission ≥ 4.5 (MOS standard)

No operational interruption events caused by optical links throughout the year