Digital Information Transmission Equipment

Supervision commissioning services means advising the Customer’s personnel and working at the Customer’s site(s). A list of works envisaged by the chief commissioning of the digital information transmission system (DITS) equipment (SDH or DWDM trunk equipment, subscriber access DITS equipment) as follows:


1. Visual inspection and installation check

1.1. Visual inspection: the integrity of the design of the cabinet and equipment mounted in the cabinet.

1.2. Verification of compliance with the equipment completeness of the equipment specification (contractual, design).

1.3. Verifying the correct installation of equipment.

1.4. Verify the correct connection of external connections (optical and electrical).


2. Turn on hardware

2.1. Checking the voltage of the power supply at the equipment power supply inputs

2.2. Turn on the equipment.

2.3. Check the correctness of the turning the equipment.

2.4. Check equipment control.


3. Retrofitting equipment (if necessary)

3.1. Installation of modules in existing equipment in accordance with project documentation

3.2. Configuring installed modules in hardware.

3.3. Installation of interface cables for installed modules (if necessary)


4. Local tests

4.1. Initial configuration of DITS equipment.

4.2. Check the operation of external alarm inputs (if used).

4.3. Check the correct functioning of the secondary power sources.

4.4. Check the correct functioning of the ventilation unit (if used).

4.5. Check the correct functioning of control units.

4.6. Check the correct functioning of the interface modules.

4.7. Measurement of the optical power level of the transmitters of the aggregate equipment modules.

4.8. Measurement of optical power at the inputs of the receivers from the line side.

4.9. Configuring DITS equipment in accordance with the project documentation.

4.10. Verify the configuration of the IP-phone intercom (if used).


5. Complex tests

5.1. Check ECC control channels (DCC) and the availability of network elements of a communication network.

5.2. Check service communication.

5.3. Check clock synchronization.

5.4. Verification of switching to the reserve (in case of using the 1 + 1 redundancy scheme).

5.5. The organization of communication channels in accordance with the project documentation (approved schemes).

5.6. Checking organized communication channels.


6. Executive documentation

6.1. Preparation of protocols for acceptance tests of equipment DITS in the form of Unitel Engineering.

6.2. Preparation of the executive scheme of the organization of communication.

6.3. Preparation of addressing tables for network elements and overhead numbering.

6.4. Preparation of channel sheet.

6.5. Registration of the Act of the executed works.