1993 Specifications CSJ 2266-02-095 SPECIAL SPECIFICATION 1789 Fiber Optic RS-232 Data Modem 1. Description. This Item shall govern for the furnishing and installation of Fiber Optic RS- 232 Data Modem (FO-MODEM) in field cabinet and in the satellite building as shown on the plans and as detailed in the Special Specifications. 2. Material. (1) General Requirements. All materials furnished, assembled, fabricated or installed under this Item shall be new, corrosion resistant and in strict accordance with the details shown on the plans and in the specifications. (2) Functional Requirements. The FO-MODEM shall support the transmission of full duplex data at true RS-232 levels on both the input and output circuits and shall operate over a single optical multimode fiber between specified locations as shown on the plans, as detailed in this specification, and as directed by the Engineer. No adjustments to the FO-MODEM shall be required, either in the field where the links are installed, nor periodically thereafter. The FO-MODEM shall be extremely versatile and easy to use. The FO-MODEM shall operate from 0 ft. to 10,000 ft. (3) Electrical/Optical Requirements. (a) Transmitting Device. The transmitting device shall be a light-emitting diode (LED). (b) Transmitter Optical Output. Output power to 62.5/125 multimode (graded index) dual window glass fiber at wavelengths of 850 nm/1300 nm, coupled with wave division multiplexor, shall be sufficient to accommodate a link loss budget of 12 db or more at each wavelength. Once design is tested and approved, the optical coupled power value and tolerance will become incorporated as part of this specification for the purpose of acceptance tests. (c) Optical Detector. The optical detector of the receiver shall be an APD diode or Pin diode. 1-5 1789
(d) Receiver Optical Input. Receiver input shall have a minimum sensitivity of 12 db, at each wavelength, below the transmitter output level and operate within the parameters of this specification. Once the design is tested and approved, the receiver sensitivity value and tolerance shall be incorporated as a part of this specification for the purpose of acceptance tests. (e) Receiver Automatic Gain Control. The receiver shall have automatic gain control (AGC) circuitry to provide the receiver with the required dynamic range from transmitter-receiver spacing of 0 to 12 at each wavelength. The above dynamic range requirements may be accomplished with external optical attenuators with the approval of the Engineer. (f) Transmitting/Receiving Devices. The transmitting/receiving devices shall have a minimum mean time between failure (MTBF) of 100,000 hours at 122 F ambient. The devices shall incorporate diagnostic Bicolor power and data activity input LEDs in both the transmitter and the receiver for quick visual indication of link operation. (g) Modulation. Modulation shall be FM. (h) Operating Mode. Asynchronous, full duplex. (i) Input/Output Impedance. Per RS-232. (j) System Bandwidth. DC to 19.2 Kbaud, minimum. (k) Optical Fiber Compatibility. Optical Fiber Compatibility shall be 62.5/125 micron (graded index) dual window multimode glass fiber. (l) Data Performance Requirements. Digital data transmitted and received by the FO-MODEM shall conform to all the requirements of EIA Standard RS-232. (m) Data Rate. The FO-MODEM shall support all required data transmission rates currently defined within an approved and published CCITT communication protocol standard. (n) Bit Error Rate (BER). The bit error rate of each data channel shall not exceed 10 to the -9 power within optical budget. (o) Power Requirements. Each FO-MODEM shall operate at 12 to 24 VAC from a separate power supply to be provided as part of this bid item and shall not draw more than 5 Watts of power each. The separate power supply shall operate from 115 VAC ± 10%, 60 Hz ± 3 Hz. The equipment operation shall not be affected by the transient voltages, surges and sags normally experienced on commercial power lines. It is the Contractor's 2-5 1789
responsibility to check the local power service to determine if any special design is needed for the equipment. The extra cost, if required, shall be included in the bid of this Item. (p) Surge Protection. Appropriate surge protectors shall be installed in the cabinet. (q) Power Service Transients. The equipment shall meet the requirements of Sec. 2.1.6., "Transients, Power Service" of the NEMA Standard TS1-1989, or the latest revision. (r) Wiring. All wiring shall meet the requirements of the National Electric Code. All wires shall be cut to proper length. Cable slacks shall be provided to facilitate removal and replacement of assemblies, panels, and modules. No wire shall be doubled back to take up slack. Wires shall be neatly laced into cable with nylon lacing or plastic straps. Cables shall be secured with clamps. (s) Transient Suppression. All DC relays, solenoids, and holding coils shall have diodes or other protective devices across the coils for transient suppression. (t) Power Service Protection. The equipment shall contain readily accessible, manually reset table or replaceable circuit protection devices (such as circuit breakers or fuses) for equipment and power source protection. (u) Fail Safe Provision. The equipment shall be designed such that the failures of the equipment shall not cause the failure of any other unit of equipment. (4) Mechanical Requirements. (a) Modular Design. The equipment shall be modular in design to allow major portions to be readily replaced in the field. Modules of unlike functions shall be mechanically keyed to prevent insertion into the wrong socket or connector. All modules and assemblies shall be clearly identified with name, model number, serial number, and any other pertinent information required to facilitate equipment maintenance. (b) Connectors and Harnesses. All external connections shall be made by means of connectors. The connectors shall be keyed to preclude improper hookups. All wires to and from the connectors shall be color coded and/or appropriately marked. Each and every conductive contact surface or pin shall be plated with 20 microns of gold. Optical input and output connectors shall be the ST type with stainless steel housing and ceramic ferrule. 3-5 1789
Digital data inputs to and outputs from the FO-MODEM shall both be via 8 pin screw terminal configured in a format compatible with the interface requirements of the data communications equipment attached. Connecting harness of appropriate length and terminated with matching connectors shall be provided for interconnection with the terminal equipment shown on the plans, or as directed by the Engineer. (c) Housing. The FO-MODEM shall be available in the standard compact serviceable modules. Dimensions of each FO-MODEM shall not exceed 4 in. deep X 7 in. wide X 2 in. high. (5) Environmental Design Requirements. The equipment shall meet all its specified requirements during and after subjecting to any combination of the following requirements. Ambient temperature range of 0 F to 140 F. Relative humidity from 0% to 95%. 3. Construction Methods. (1) General. The equipment design and construction shall utilize the latest available techniques with a minimum number of parts, subassemblies, circuits, cards, and modules to maximize standardization and commonality. The equipment shall be designed for ease of maintenance. All component parts shall be readily accessible for inspection and maintenance. Test points shall be provided for checking essential voltages and waveforms. (2) Electronic Components. All electronic components shall comply with Special Specification, "Electronic Components". (3) Mechanical Components. All external screws, nuts, and locking washers shall be stainless steel; no self-tapping screws shall be used unless approved by the Engineer. All parts shall be made of corrosion resistant material, such as plastic, stainless steel, anodized aluminum, or brass. All materials used in construction shall be protected from fungus growth and moisture deterioration. Dissimilar metals shall be separated by an inert dielectric material. (4) Documentation Requirements. The documentation requirements shall be in accordance with the Special Specification, "Testing, Training, Documentation, Final Acceptance and Warranty", Article 4. (5) Testing. The testing shall be in accordance with the Special Specification, "Testing, Training, Documentation, Final Acceptance and Warranty", Article 2.and Article 5. 4-5 1789
Testing shall also include the following: Data Performance Tests. Digital data performance testing shall include all tests necessary to ensure compliance with all of the requirements of EIA Standard 232. These tests shall, as a minimum, demonstrate data communications between each of the data channel unit in the control center and the corresponding data channel unit in the field. Using a loopback plug at each EIA-232 channel terminating at a field location, a 24 hour Bit Error Rate Test (BERT) for each channel shall be conducted using a data communications test set in the control center. This BERT is used to determine the Bit Error Rate (BER) through the system and terminating equipment at each end, and to certify that the EIA-232 channels can operate at a sustained rate of 9600 bits/sec (bps) for a 24 hour period. The 511-bit CCITT standard pseudo-random pattern shall be used for testing. The BER measured at 9600 bps shall not exceed the requirements of Section 2.(3)(n) of this Specification, and the error free seconds (EFS) shall be better than 99.98%. If this BER is exceeded on any channel, the problem shall be corrected and the entire BERT shall be completely restarted from the beginning, as if no previous BERT had been conducted. If a component has been modified as a result of the subsystem test failure, a report shall be prepared and delivered to the Engineer prior to testing. (6) References. The FO-MODEM supplier shall submit 3 references, preferably State Departments of Transportation, that have been successfully operating a data transmission system supplied by this supplier, for a period of no less than 1 year. Reference data shall include name and address of organization, and the name and telephone number of an individual from the organization who can be contacted to verify system. (7) Training. The training shall be in accordance with Special Specification, "Testing, Training, Documentation, Final Acceptance and Warranty", Article 3. (8) Warranty. The warranty shall be in accordance with the Special Specification, "Testing, Training, Documentation, Final Acceptance and Warranty", Article 6. (9) Measurement. This Item will be measured as each unit furnished, installed, made fully operational and tested in accordance with these Special Specifications or as directed by the Engineer. (10) Payment. The work performed and material furnished in accordance with this Item and measured as provided under "Measurement" will be paid for at the unit prices bid for "Fiber Optic RS-232 Data Modem". This price will include all equipment described under this Item with all cables and connectors, all documentation and testing and shall include the cost of furnishing all labor, materials, training, warranty, equipment and incidentals necessary to complete the work. 5-5 1789