This Special Provision covers the requirements for the installation and testing of fibre optic modems (FOM).

Transcription

1 FIBRE OPTIC MODEMS - Item No. Special Provision No. 683S09 September SCOPE This Special Provision covers the requirements for the installation and testing of fibre optic modems (FOM). 2. REFERENCES This Special Provision refers to the following standards, specifications, or publications: Electronic Industries Alliance / Telecommunications Industry Association: EIA/TIA-232-E TIA/EIA-404-B EIA-RS-310-D Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Binary Data Interchange Standard for Start-Stop Signal Quality for Non-Synchronous Data Terminal Equipment Cabinets, Racks, Panels and Associated Equipment 3. DEFINITIONS Not Used 4. DESIGN AND SUBMISSION REQUIREMENTS 4.1 Submission Requirements The Contractor shall supply the specification sheets for the fibre optic modems to the Contract Administrator for review prior to ordering. 5. MATERIALS 5.1 Fibre Optic Modem General The FOM shall provide full duplex communication between two TIA/EIA-232-E data ports and shall allow a multidrop communications circuit to be formed using a pair of optical fibres as the transmission medium The FOM shall be configured as DCE The FOM shall be supplied with a cross connect device to permit communications between two DCE ports. The cross connect device may be internal to the FOM and selectable to provide DTE or DCE interface The FOM shall be configurable to operate in two modes designated as the repeater mode and the feeder mode. Selection of the operating mode shall be performed by means of a switch easily accessible without disassembly of the FOM. September 2007 Pg. 1 of 5 SSP 683S09

2 A FOM which is to be electrically connected to a DCP or a PSD shall be cross connected to provide DCE to DCE interface and shall operate in the feeder mode A FOM which is to be electrically connected to a field controller or a Camera Control Receiver shall be configured to provide DTE to DCE interface and shall operate in the repeater mode Two FOMs interconnected by optical fibre shall provide full duplex communications on circuits BA and BB. The setting of circuit CA ON on either FOM shall result in circuit CF turning ON on the other FOM. Circuit identification shall be in accordance with TIA/EIA- 232-E The FOM shall raise Clear to Send ON after it detects Request to Send ON The Contractor shall coordinate the Request to Send to Clear to Send delay with the DCP so as to minimize system data delay and to not lose any data. The Request to Send to Clear to Send delay shall not exceed 0.5 ms It shall be possible to interface two FOMs in the feeder mode through one or more FOM in the repeater mode All interconnections between FOMs shall be by multimode optical fibre A FOM shall have four optical ports (two transmitters and two receivers). Two of the ports (one transmitter and one receiver) shall be designated for upstream communication and two shall be designated for downstream communication When selected to operate in the repeater mode the FOM shall operate as follows: a) All data information received through the upstream receiver shall be output on the TIA/EIA-232-E interface and shall be repeated through the downstream transmitter b) When Request to Send is OFF on the FOM TIA/EIA-232-E interface, all data and control signal information received through the downstream receiver shall be repeated through the upstream transmitter c) When Request to Send is ON on the FOM TIA/EIA-232-E interface, all data and control signal information received through the downstream receiver shall be inhibited and all data and control signal information received from the TIA/EIA-232- E interface shall be transmitted through the upstream transmitter When selected to operate in the feeder mode the FOM shall operate as follows: a) All data information received from the upstream and downstream receivers shall be output on the TIA/EIA-232-E interface. b) All data information received from the TIA/EIA-232-E interface shall be output through the upstream and downstream transmitters. September 2007 Pg. 2 of 5 SSP 683S09

3 Each FOM shall transmit information to another FOM through multimode optical fibre by means of a LED and all required bias circuitry LEDs shall transmit with a centre wavelength of between 820 nm and 870 nm at 25 o C. LEDs shall be coupled to optical fibre through an ST style compatible connector or panel mount receptacle mounted on the FOM The LED launch power shall be equal to or greater than 13 db greater than the receiver sensitivity The receiver shall be coupled to the optical fibre through an ST style compatible coupling or panel mount receptacle mounted on the FOM The receiver sensitivity shall be defined as the minimum optical power required to be received by the receiver to operate with a bit error rate of Two FOMs interconnected by optical fibre with a total optical attenuation between 3 and 13 db shall provide data communication between two TIA/EIA-232-E ports at a speed of 9600 baud with the created pulse width distortion not exceeding 1.5 µs Pulse width distortion shall be defined as the difference between the pulse width into one FOM TIA/EIA-232-E port and the output pulse width from the TIA/EIA-232-E port of an interconnected FOM. Pulse width shall be measured in units of time between the mark-tospace and space-to-mark transitions of any particular data bit measured in accordance with TIA/EIA- 404-B The FOM shall include all mounting hardware to mount it in an existing EIA standard 480 mm equipment rack supplied by the Ministry in each cabinet The FOM shall have a D-Type 25 pin connector providing an TIA/EIA-232-E compatible interface Pins 1, 2, 3, 4, 5, 6, 7, 8 and 20 shall be assigned in accordance with TIA/EIA-232-E. All other pins of the electrical interface shall not be connected LEDs shall be derated so that the peak optical power is emitted at least 3 db below the power launched when driven at the maximum rated drive current The LED launch power shall be defined as the power launched by the LED into one metre of graded index optical fibre with a nominal core dimension of 62.5 µm, a nominal cladding dimension of 125 µm and a theoretical numerical aperture of Each FOM receiver shall receive information from the optical fibre by means of PIN photodiode and all required circuitry Power Supply The FOM power supply shall meet the following requirements: a) The power supply shall operate from an input voltage of 120 V 60 Hz nominal September 2007 Pg. 3 of 5 SSP 683S09

4 b) The power supply shall have DC outputs rated to meet the voltage and current requirements of the FOM c) Output current shall be protected against damage in the event of a short circuit d) The power supply shall have a minimum Mean Time Between Failure of 50,000 hours 6. EQUIPMENT Not Used 7. CONSTRUCTION 7.1 FOMs shall be installed in the cabinets identified in the drawings and shall share the available equipment space with existing equipment. 7.2 The drawings show the equipment space allocated to FOMs and PSDs for typical cabinet arrangements. 7.3 The Contractor shall coordinate the physical space required by the FOMs or PSDs required to be collocated to ensure that they will be accommodated in the allocated space. 7.4 The Contractor shall connect the FOM power supply to one of the 115VAC 60 HZ power distribution panel receptacles reserved for communication equipment. 7.5 Each FOM shall be configured as DCE or DTE and shall be selected to operate in repeater or feeder mode in accordance with the Contract. 7.6 The Contractor shall connect the correct Drop Cable connectors to each FOM in accordance with the drawings. 7.7 When connecting optical communication equipment, the Drop Cables shall be neatly trained along the rails of the equipment rack. 7.8 No Drop Cables shall be installed with a bending radius exceeding the manufacturer s minimum recommended bending radius Quality Control The Contractor is responsible for all testing and documentation required to establish approval and acceptance of installation and operation of this equipment. The framework of the approval process shall be as specified elsewhere in the Contract Documents. The following table details the clauses within this Special Provision, which are to be validated through the PIT, POP, and SIT processes as indicated: CLAUSE PIT POP SIT September 2007 Pg. 4 of 5 SSP 683S09

5 CLAUSE PIT POP SIT Testing Footnotes: 1 All testing to be done at a bit error rate of Test 2 fibre optic modems at a bit error rate of 10-9, and the rest at QUALITY ASSURANCE - Not Used 9. MEASUREMENT FOR PAYMENT Measurement for payment of the number of fibre optic modems is by Plan Quantity as may be revised by Adjusted Plan Quantity. The unit of measurement is each. 10. BASIS OF PAYMENT Payment at the Contract price for the above tender item shall be full compensation for all labour, Equipment and Material required to do the work including delivery, installation, testing and the production of all drawings, text and test results, except for SIT which is paid for under a separate item. September 2007 Pg. 5 of 5 SSP 683S09