1 General Provisions
1.0.1 A submarine optical fiber communication system is the application of optical fiber cable communication technologies in the special environment of sea bottom.With over 30, 000km of coastline, China has been expanding, along with further reform and opening-up, its marine exploration and development and utilization.The application of submarine optical fiber cable communication has been growing fast too.Besides telecommunication carriers, other industries and organizations also have growing demand for submarine optical fiber cable communication.With this code formulated, the construction and acceptance of submarine optical fiber cable systems will be standardized to a higher level.
1.0.2 Submarine optical fiber cable projects that land in the Chinese mainland, extend to other countries, Hong Kong, Macao, or Taiwan, and have investors from foreign countries, Hong Kong, Macao, or Taiwan are referred to as cross-border submarine optical fiber cable projects.Cross-border submarine optical fiber cable projects are mostly carried out by consortium.The design and construction of such projects shall follow the technical requirements and procedures of acceptance that are agreed upon by all investors.The technical requirements and project management model are different in some aspects from those of similar domestic projects.Therefore, this code may serve as reference for cross-border submarine optical fiber cable projects.
Optical fiber cable projects that cross rivers and submarine optical and electrical hybrid cable projects may also use this code as reference.
For extension and renovation projects, the renovated or extended parts may be consistent with the existing project.
Submarine cable line is the umbrella term of all submarine system elements in the cable route, including land cable, land cable joints and submerged plant.
1.0.3 For optical fiber submarine cable systems in areas where seismic fortification intensity is 7 degrees or above, the equipment shall meet seismic performance requirements for communication networks.
1.0.4 Project acceptance of optical fiber submarine cable systems shall comply with not only the requirements stipulated in this code, but also those in the current relevant ones of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1
submarine repeater
optical submarine repeaters can be categorized into optical submarine amplifying repeaters and optical submarine regenerative repeaters:
A submarine optical amplifying repeater, powered by remote feeding power, amplifies optical signals, receives and transmits monitoring signals.In this code, it refers to EDF amplifier-based submarine optical amplifying equipment.
A submarine optical regenerative repeater, powered by remote feeding power, amplifies optical signals, receives and transmits monitoring signals.In this code, it refers to the submarine optical repeater that converts optical signals into electric signals and then converts them back to optical signals after regeneration, reshaping and retiming (3R).
2.1.2
repeatered submarine cable system
a submarine system that deploys submarine repeater (s).
2.1.3
repeaterless submarine cable system
a submarine system that deploys no submarine repeater.
2.1.4
beach manhole
a manhole set on the landing beach of submarine cable, used to terminate the submarine cable and connect it with land optical/power cable.
2.1.5
cable landing point
when a landing station is close to the beach (usually no more than 2km) and there is a cable tunnel leading directly to the cable vault of the landing station, there may not be a beach manhole and the cable vault may perform its function instead.
2.1.6
cable landing station
terminal station of an optical fiber submarine cable system, where SLTE equipment, monitoring equipment and power feeding equipment may all be installed.
2.1.7
sea wall
A wall built near the shore to block off sea water.
2.1.8
segment
all devices of the optical fiber submarine system between two adjacent SLTE connected to the same pair of fibers.
2.1.9
anchorage area
a special designated area where ships may anchor.
2.1.10
landing section
submarine cable from the beach manhole to where the sea depth is 5m.
2.1.11
power feeding system
a power supply system that uses the loop formed by the earth and the power conductor in the submarine cable to provide power for submerged equipment.
2.1.12
cable route desk top study
to propose one or more cable routes that are technically and economically viable based on the topological design of the submarine cable system and through collection and analysis of existing geophysical data, marine environment and marine development activities.
2.1.13
route survey
carrying out field survey for the cable route plans proposed in the cable route desk top study through geological sampling, geophysical survey, on-site observation, etc., to ascertain the optimal route through comprehensive evaluation and comparison of information obtained, and to provide scientific and technical grounds for cable system design and installation.
3 Inspection of Equipment and Materials
3.1 Generic Requirements
3.1.1 Inspection of equipment and materials shall be conducted in the presence of both the project owner's or the supervision company's representatives and the representatives of the construction company.
3.1.2 Equipment and materials shall be visually inspected；specifications and models shall be checked；and quantity shall be counted.More focused inspection shall be conducted when any abnormity is found.
3.1.3 A detailed record shall be made for the equipment and materials that have been inspected.
3.2 Equipment Inspection
3.2.1 Equipment specifications, models and quantity shall meet the requirements of the procurement contract and design document.
3.2.2 Equipment packaging shall be complete, without signs of breakage, being damped or overheating and free of significant depressions.
3.2.3 All equipment shall be checked against the packing list and properly recorded.
3.2.4 After inspection, all equipment shall be stored in a classified manner and properly marked to indicate category and quantity.Special attention shall be paid to the storage of small components to prevent loss.
3.2.5 When inspection is completed, the inspection site shall be cleaned up and the inspection results shall be subject to the confirmation of the project owner or the project supervision engineer.
3.2.6 Factory test records of equipment shall be checked to make sure that they meet the requirements of procurement contract and design document.
