1.0.1 This code was formulated with a view to preferably implementing the relevant principles and policies of the Nation in the 1ocal wire telephone communication system engineering for harbor, and to improving the design level, guaranteeing the engineering quality, achieving safety, reliability, advanced technology, economy, rationality and maintenance convenience.
1.0.2 This code is applicable to the design of the constructed, renovated and extended wire telephone communication system engineering in coastal harbors and inland river harbors. The design of the wire telephone communication system engineering of inland river ship lock and dike field may also be implemented by making reference to this code.
1.0.3 The 1ocal wire telephone communication system engineering for harbor is the auxiliary project of harbor construction engineering, its construction contents and scale shall be corresponding to the harbor construction, and the planning, design and construction shall be carried out synchronously.
The planning and design of the 1ocal wire telephone communication system engineering for harbor shall meet the relevant requirements of the "Overall Planning of Nationwide Traffic Private Communication Network", the overall planning of harbor in this port and the special telephone communication technology system.
1.0.4 The approved products that meet the current national standards shall be adopted for the main communication equipments , and those non-certified products shall not be adopted in the design.
2 Terms and Symbols
2.1 Terms
Traffic private communication network
It is the important component of national telecommunication network and is composed of the communication network for water transportation, the communication network for highway, the Grade 1 communication network for long distance and the communication network for maritime safety emergency.
Communication network for water transportation
It comprises the maritime communication network and the inland river communication network, and they both include the local communication network for harbor, the ship-shore radio communication network and the harbor-harbor long distance communication network.
Local wire telephone communication for harbor
It is the local wire telephone communication under the jurisdiction of a harbor, including the business telephone, dispatching telephone and conference telephone of the harbor area.
Local telephone network for harbor
It is an important component of communication network for water transportation, and it is the short form of the local wire telephone communication network for harbor that is composed of one or more terminal offices and junction offices.
Communication office
It is the general term of the terminal offices and junction offices in the telephone network.
2.2 Symbols
BHCA Busy Hour Call Attempt.
ISDN Integrated Service Digital Network.
DOD Direct Outward Dialling.
DOD1 Direct Outward Dialling one.
DOD2 Direct Outward Dialling two.
DID Direct Inward Dialling.
BID Board Inward Dialling.
PAMA Private Automatic Message Accounting.
CAMA Centralized Automatic Message Accounting.
PCM Pulse Code Modulation.
DTMF Dual-tone Multifrequency.
UPS Uninterruptable Power Supply.
HDB3 High Density Bipolar 3 Code.
DDF Digital Distribution Frame.
MDP Main Distributing Frame.
3 Communication Office
3.1 General Requirements
3.1.1 The network configuration of 1ocal telephone network shall be constructed according to terminal office and junction office for the large harbor area in which the operation areas are dispersed, and shall be constructed according to the terminal office grade 1 for the small harbor area . Upon technical and economical comparison, the remote end module or the digital subscriber loop equipment may be set in the building that is relatively far away from the terminal office and has relatively concentrated subscribers.
The terminal office shall be able to independently process the call making and receiving of the subscribers in this office. The junction office shall be able to independently process the transit calls and also shall possess the functions of terminal office.
3.1.2 The layout of 1ocal telephone network for harbor shall be comprehensively considered according to the general layout and planning of this harbor, the distribution and transmission requirements of subscribers.
The junction office should be located near to those places where subscribers are relatively concentrated, like the private trunk board for transportation, the harbor-shipping units and institutions, and the terminal office shall be located in the operation area or the place with subscribers densely distributed.
