1993 Specifications CSJ SPECIAL SPECIFICATION ITEM Drop/Insert Multiplexor/Demultiplexor

Transcription

1 1993 Specifications CSJ SPECIAL SPECIFICATION ITEM 6550 Drop/Insert Multiplexor/Demultiplexor 1.0 Description. This Item shall govern for the furnishing and installation of intelligent drop/insert multiplexor/demultiplexor (D/I Muldem) in designated surveillance cabinets in the field and in the Satellite building as shown on the plans and as detailed in the Special Specifications and as directed by the Engineer. 2.0 Material. 2.1 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. 2.2 Functional Requirements. The D/I Muldem shall operate with a standard pulse code modulation (PCM) T-1 data stream (North American PCM DS-1 line per AT&T Technical Advisory 34) with a bit rate of Mb/s. The D/I Muldem shall be designed for multipoint drop and insert functions. The device shall be capable of receiving selected data channels from the Satellite building (drop) and of transmitting selected data channels back to the Satellite building (insert). The device shall also provide integrated receiving and transmitting selected omni order voice channels, each operating as a "party line", to/from the Satellite building and the surveillance cabinets. Each D/I Muldem shall have the plug-in provisions, including connectors, for data and omni order voice channel unit assignments as shown on the plans. Since each data channel operates with a polled time division multi-drop subrate multiplexing scheme, the D/I Muldem shall have subrate data channel units sharing the same time subrate channels slots as other D/I Muldem data channel units at multiple locations. The D/I Muldem shall pass upstream signals from the field channels through to the Satellite building as well as passing downstream signals from the Satellite building on to the rest of the D/I Muldems. All D/I Muldems shall be connected to the fiber optic cable via fiber optic data transceivers, with one transceiver connected for downstream signal flow and a second transceiver for upstream signal flow. Optical transceivers may be made an integral part of the D/I Muldem with the approval of the Engineer Equipment Interconnection. The surveillance cabinet shall contain the interconnections of all external

2 devices to the fiber optic cable plant via the D/I Muldem, video transmitter(s), data transceiver(s), and transient protection devices. External devices include, but are not limited to, local control units (LCU), digital card rack loop detectors, lane control signal control panels, modular fiber distribution housing, subrate data multiplexer distribution panel, voice communications equipment, camera field controllers and/or Changeable Message Sign (CMS) controllers. The CMS controllers shall be located in sign controller cabinets external to the surveillance cabinets. Connections to the D/I Muldem I/O ports shall use twisted wire pairs and DB25 connectors based on the channel designations shown on the plans, using the EIA-232-C/D standard. Between the D/I Muldem and the CMS controllers, as shown on the plans, Fiber Optic RS-232 Data Modem, as detailed in Special Specification Item, "Fiber Optic RS-232 Data Modem," shall be employed so as to maintain EIA-232-C/D communications integrity. 2.3 Electrical Requirements Channel Capacity. The D/I Muldem shall provide for the receiving from and transmitting to any of the twenty-four (24) data and/or voice orderwire channel time slots Mode of Transmission. Full duplex transmission shall be provided for each data and voice orderwire channel PCM Modulation Method. Modulation shall employ standard AT&T pulse code modulation with a sample rate of 8000/sec. and time division multiplexing technique T-1 Line Interface. Line rate shall be mb/s plus or minus 200 b/s. Line code and transmit/receive signals shall be defined by the Contractor subject to the Engineer's approval, and shall be compatible with Special Specification Item, "Data Fiber Optic Transceiver" T1 Carrier Regeneration. Each D/I Muldem shall regenerate the T1 bit stream for transmission with a delay of less than 8 microseconds Subrate Data Multiplexer (SDM) Channel unit. Each RS- 232C/D asynchronous data channel interface shall be identical and interchangeable throughout the D/I Muldem system. Each SDM channel unit shall be an entire subrate data multiplexer on a single compact card and fully integrated in the D/I muldem. The card shall be removable from the front of the assembly. The channel unit shall obtain operating power from the drop/insert multiplexor. The front panel of each channel unit shall contain LED indicators for unit status indication. All necessary cables and connectors shall be provided with each channel unit. All channel units shall be from the same manufacturer. The SDM channel unit shall combine low speed data channels directly onto T1 facilities. The unit shall be a plug in channel unit for the D/I muldem, providing up

3 to five separate asynchronous full duplex channels at mixed speeds of 2.4, 4.8, 9.6 and/or 19.2 kbps over one DS0 channel. It shall be software programmable and shall include remote provisioning and diagnostics through inband communication not using one of the five subrate channels as a diagnostic and provisioning channel. The unit shall be bidirectional and operate in the drop and insert mode, capable of communicating in both directions on the T1 for future loop protection purposes. The unit shall be DDS compatible (ATT publication 54075) and shall support network controllable (DDS) loopback tests and local loopback tests. The SDM channel unit must support multi-drop point to multi-point service for all low speed channels. The SDM channel unit's RS-232 ports shall terminate in separate DB25 connectors located in the SDM distribution panel. This panel shall be one rack unit high shelf that shall be mounted flush with either the top or bottom of the D/I muldem. Each panel supports up to five (5) DB25 (RS-232) connectors Omni Orderwire Voice Channel Unit. The unit shall be a plug-in channel unit for the D/I muldem, providing a single bridge voice communications path between all D/I muldems on each route in the network on a single DS0. The unit shall allow a standard two wire DTMF telephone to be connected. From the telephone set the user shall be able to dial any station in the network or dial a single four digit code to ring all stations for a conference call. The unit shall be remotely provisionable and will provide remote diagnostics over the diagnostics and provisioning channel of the subrate channel card Fail Safe Provisions. In the event of power or equipment failure in the D/I Muldem, the unit shall automatically bypass the line such that two-way communications in the T1 and fiber pair is not broken or impaired, limiting the loss of communications only to the failed D/I Muldem Power Requirements. The D/I Muldem shall meet all of its specified requirements when the input power is AC power, 60 plus or minus 3 Hz, single phase, 115 plus or minus 10%. The maximum power required shall not exceed 120 Watts. The equipment operations shall not be affected by transient voltages, surges and sags normally experienced on commercial power lines. It is the Contractor's 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 price of this item Primary Input Power Interruption. The equipment shall meet all the requirements in Section "Power Interruption" of the National Electrical Manufacturers Association (NEMA) Standard TS for Traffic Control Systems, or the latest revision

4 Power Service Transients. The equipment shall meet the requirements of Sec , "Transients, Power Service" of the NEMA Standard TS or the latest revision Wiring. All wiring shall meet the requirements of the National Electric Code. All wires shall be cut to proper length before assembly. 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. Cable slack shall be provided to facilitate the removal and replacement of assemblies, panels, and modules for maintenance Transient Suppression. All DC relays, solenoids and holding coils shall have diodes across the coils for transient suppression Power Service Protection. The equipment shall contain readily accessible, manually resettable circuit breakers for equipment and power source protection. Circuit breakers or fuses shall be provided and sized such that no wire, component, connection, PC board or assembly shall be subjected to sustained current in excess of their respective design limits upon the failure of any circuit element or wiring. 2.4 Mechanical Requirements Enclosure. The D/I Muldem shall be packaged in a sturdy, durably finished sheet metal housing suitable for mounting in standard EIA 19" racks. Card cages and all necessary accessories shall be provided for the configuration shown on plans. Front panels and/or covers shall be provided to cover the unused slots Modular Design. The equipment shall be modular in design such that major portions may 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 Connectors and Harness. 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. For each data channel unit, a harness shall be provided with a DB-25 connector attached at the D/I Muldem interface end and the other end to the terminating transient protection connections. Each voice orderwire channel shall have a harness with a RJ-11 connector at

5 the D/I Muldem interface end and the other end to the terminating transient protection connections. Each and every conductive contact surface or pin shall be plated with a minimum of 20 microns of gold. 2.5 Environmental Design Requirements. The equipment shall meet all its specified requirements during and after subjecting to any combination of the following conditions. - Ambient temperature range of 0 to 140 degrees F. - Temperature shock not to exceed 30 degrees F per hour, during which the relative humidity shall not exceed 95%. - Relative humidity range not to exceed 95% over the temperature range of 0 to 140 degrees F. - Moisture condensation on all surfaces caused by temperature changes. 3.0 Construction Methods. 3.1 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. 3.2 Electronic Components. All electronic components shall comply with Special Specification "Electronic Components". 3.3 Mechanical Components. All external screws, nuts and locking washers shall be stainless steel; no self-tapping screws shall be used unless specifically 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. 3.4 Documentation Requirements. The documentation requirements shall be in accordance with the Special Specification "Testing, Training, Documentation and Warranty", Section Testing. The testing shall be in accordance with the Special Specification "Testing, Training, Documentation and Warranty", Sections Testing shall also include the following: 1. Subsystem Test. The Contractor shall conduct data communications Subsystem Tests after the integration of the D/I Muldems with the data fiber optic transceivers and the fiber optic network. The tests shall, as a

6 minimum, demonstrate data communications between each of the data channel units in the satellite building and the corresponding data channel units in the field. Using a loopback plug at each RS-232 channel terminating at a field location, the Contractor shall conduct a 24 hour bit error rate test (BERT) for each distinct RS-232 channel, using a data communication test set in the satellite building. This system error rate test is used to determine the bit error rate through the fiber system and terminating equipment at each end, to certify that the RS-232 channels can operate at a sustained rate of 9600 bits per second (bps) for a 24 hour period. The 511-bit CCITT standard pseudo-random pattern shall be used. The bit error rate (BER) measured at 9600 bps shall not exceed 10 to the minus 9 power and the error free seconds (EFS) shall be better than 99.98%. If the specified error rate is exceeded on any channel test described under the system error rate test, the problem shall be corrected and the entire system error rate test shall be completely restarted from the beginning, as if no previous BER tests had been conducted in the system. 4.0 Training. The training shall be in accordance with the Special Specification "Testing, Training, Documentation and Warranty", Section Warranty. The warranty shall be in accordance with the Special Specification "Testing, Training, Documentation and Warranty", Section 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. 7.0 Payment. Work performed and materials furnished in accordance with this Item and measured as provided under "Measurement" will be paid for at the unit price bid for each "D/I Muldem". This price shall include all equipment described under this item with all cables and connectors; and shall also include the cost of furnishing all labor, materials, warranty, training, all documentation, testing, equipment, and incidentals necessary to complete the work