1995 Metric CSJ , etc. SPECIAL SPECIFICATION ITEM D-I Muldem (Drop/Insert Multiplexor/Demultiplexor)

Transcription

1 1995 Metric CSJ , etc. SPECIAL SPECIFICATION ITEM 6588 D-I Muldem (Drop/Insert Multiplexor/Demultiplexor) 1. Description. This Item shall govern for the furnishing and installation of intelligent drop/insert multiplexor/demultiplexors (D/I Muldems) at designated communication hubs as shown on the plans, as detailed in the Special Specifications and as directed by the Engineer. 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 Contractor shall furnish and install D4 type or equivalent PCM channel banks, referred herein as D/I Muldems, at the locations shown on the contract plans. The D/I Muldems shall be fully compatible with ANSI/EIA Standard T1.102 format signal at the DS-1 level. The D/I Muldems shall serve as multiplexers and demultiplexers. As multiplexers, they shall accept as input DS-0 level voice frequency and digital data signals (1.2 kb/s to 56 kb/s) and shall perform sampling, quantizing and coding of the signal into a multiplexed Pulse Code Modulation (PCM) DS-1 level signal into an adjacent DSX jackfield. DS-1 level signals shall operate at Mb/s and shall be compliant with Bellcore specifications (PUB 43801). As demultiplexers, they shall accept DS-1 level signals and shall output DS-0 level voice frequency and digital data signals. Each D/I Muldem shall be capable of multiple DS-1 inputs/outputs. Each DS-1 group shall multiplex up to twentyfour voice or data channels into a single DS-1 bit stream. Each D/I shall be equipped with a display on the front panel for indicating the status of the multiplexer. The alarm messages displayed shall indicate failures to the printed circuit board level. In addition, each D/I Muldem shall be equipped with alarm output relay contacts for indication of

2 major failures (affecting service) and minor failures (not affecting service). The alarm output contacts shall be used to interface with the network management system, as described elsewhere. The D/I Muldem shall be capable of remote diagnostics and system management. The D/I Muldem shall be capable of network management functions by means of SNMP (simple network management protocol). The D/I Muldem shall allow user interrogation of muldem status and operation down to the DS-0 or sub-rate channel, and physically down to each port. The D/I Muldem shall allow for a ring generator. The ring generators furnished shall supply 110 VAC, twenty(20) Hz continuous ringing rated at fifteen (15) VA. The ring generators shall be mounted in standard EIA equipment racks, as shown on the Drawings and shall be equipped with alarm output relay contacts to indicate a failure of the ring generator. The ring generator alarm contacts shall be interconnected to the local nodal fiber optic alarm and network management system to provide indication of ring generator failure. 1. Equipment Interconnection. The communications hub shall be the point of demarcation for all circuits to be transported over the communications backbone. Low speed RS-232 circuits shall be received from optical modems used for traffic signal controller and CCTV control channels. Each RS-232 channel may contain multiple (multi-dropped) locations, as shown on the plans. Voice communications shall be provided at each remote hub via 2-wire FXO/FXS cards or ports within the channel bank. The voice circuit shall consist of a standard 2554 type DTMF wall mount telephone mounted within the communication hub cabinet, as specified elsewhere, connected to the City of El Paso Traffic, via the 2-wire FXO/FXS connection. The D/I Muldem shall be capable of transporting the above circuits. (3) Electrical Requirements. 1. Channel Capacity. The D/I Muldem shall provide for receiving from and transmitting to any of the twenty-four (24) data and voice channel time slots. 2. Mode of Transmission. Full duplex transmission shall be provided for each data and voice channel. 3. PCM Modulation Method. Modulation shall employ standard AT&T pulse code modulation with a sample rate of 8000/sec and a time division multiplexing technique. 4. DS-1 Line Interface. Line rate shall be Mb/s plus or minus 200 b/s. Line code and transmit/receive signal s shall be defined by the Contractor subject to the Engineer's approval. 5. DS-1 Carrier Regeneration. Each D/I Muldem shall regenerate the DS-1 bit stream for transmission with a delay of less than 8 microseconds

3 6. Subrate Data Multiplexer (SDM) Channel unit. The D/I Muldem shall have the capability to multiplex sub-rate low speed channels into a DS-0 channel. 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 multiplexer. 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 DS-1 facilities. The unit shall be a plug in channel unit for the D/I muldem, providing up 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 DS-1 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, which will act as an RS-232 port expander to distribute a master signal to multiple slave sites. 7. Data Channel Unit. Each data port card shall interface with one four-wire baseband bipolar data link. The data rate shall be switch selectable 2.4, 4.8, 9.6 or 56 kb/s synchronous. On the transmit side, the data port shall accept the incoming six bit serial data (seven bit for 56 kb/s inputs) and transform it to eight bit data via bit stuffing. The eight bit data is then output repeatedly (20 times for 2.4 kb/s inputs, once for 56 kb/s inputs) to form a 64.0 kb/s (DS-0) signal for multiplexing to the DS-1 rate. On the receive side, the data port shall accept a DS-0 bit stream, derived from the DS-1 signal. The DS-0 signal is then error corrected by a majority vote on the

4 repeated bits received (no error correction for 56 kb/s data) and the stuff bits are removed. The data is then output over the four-wire baseband bipolar data link. 8. Voice Channel Unit. The D/I Muldem shall be capable of a minimum of four different types of voice frequency interface cards: - Two-wire E&M Cards - Four-wire E&M Cards - Two-wire FXO Cards - Two-wire FXS Cards Each card shall provide a 600 ohm interface for an analog VF circuit and shall provide bi-directional signaling indications appropriate for the type of signaling (E&M or FXO/FXS) being used in the circuit. The card type shall be permanently labeled on the front panel of the card with test access available for the Tip, Ring, Tip 1, Ring 1, E-Lead and M-Lead connections. Test access shall be direct, via either bantam jacks located on the front panel of the card or a multi-pin patch cord leading to a VF patch panel equipped with 310 or bantam jacks. A handle for inserting and removing the card shall be located on the front panel. Cards shall lock into place when fully inserted into the edge connector socket. Two-wire and four-wire E&M cards shall be configurable for loop-start or ground-start, normal or inverted E&M signaling. Two-wire cards shall be interfaced to the line with an internal hybrid so that all internal signal processing shall be similar to that for the four-wire cards. The internal hybrid shall include selectable network build out capacitance of 0.0 to.126 mf in.002 mf increments. Two-wire and four-wire cards shall be transformer isolated from the circuit, with capacitive coupling so that DC talk-battery can be applied to the instrument side of the circuit. Two-wire Foreign Exchange Office (FXO) and Foreign Exchange Subscriber (FXS) Cards shall be configured for loop-start or ground-start signaling on PBX or Telco circuits. FXO cards shall be used at the office end of the circuit and FXS cards shall be used at the instrument end of the circuit. Two-wire FXO and FXS cards shall have internal hybrids with selectable network build out capacitive coupling so that DC talk-battery can be applied to the instrument side of the circuit. 9. 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 is not broken or impaired, limiting the loss of communications only to the failed D/I Muldem. 10. 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

5 Volts. 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. 11. 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 latest revision. 12. Power Service Transients. The equipment shall meet the requirements of Sec , "Transients, Power Service" of the NEMA Standard TS2-1992, or latest revision. 13. 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. 14. Transient Suppression. All DC relays, solenoids and holding coils shall have diodes across the coils for transient suppression. 15. 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 single circuit element or wiring. (4) Mechanical Requirements. 1. Enclosure. The D/I Muldem shall be packaged in a sturdy, durably finished sheet metal housing suitable for mounting in standard EIA millimeter racks. Card cages and all necessary accessories shall be provided for the configuration shown on the plans. Front panels and/or covers shall be provided to cover the unused slots. 2. 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

6 All modules and assemblies shall be clearly identified with name, model number, serial number and any other pertinent information required to facilitate equipment maintenance. 3. 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. The card cage shall provide 24 separate card slots. 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 channel shall have a harness with a RJ-11 connector at the D/I Muldem interface end and the other end to the terminating transient protection connections. Each unused connector shall be equipped with an individually removable plastic cover. Each and every conductive contact surface or pin shall be plated with a minimum of 20 microns of gold. (5) Environmental Design Requirements. The equipment shall meet all its specified requirements during and after subjecting to any combination of the following conditions: 3. Construction Methods. (1) General. - Ambient temperature range of 0 to 50ºC. - Temperature shock not to exceed 10ºC per hour, during which the relative humidity shall not exceed 95 percent. - Relative humidity range not to exceed 95 percent over the temperature range of 0 to 50ºC. - Moisture condensation on all surfaces caused by temperature changes. 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"

7 (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. (4) Documentation Requirements. Documentation for the Drop/Insert Multiplexor/Demultiplexor shall comply with Section 4.0 of Special Specification, "Testing, Training, Documentation, Final Acceptance and Warranty". (5) Testing. The testing shall be in accordance with the Special Specification, "Testing, Training, Documentation, Final Acceptance 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 fiber optic network. The tests shall, as a minimum, demonstrate data communications between each of the data channel units in the central hubs 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 central hubs. 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

8 4. Training. Training for the Drop/Insert Multiplexor/Demultiplexor shall comply with Section 3.0 of Special Specification Item, "Testing, Training, Documentation, Final Acceptance and Warranty". 5. Warranty. Warranty for the Drop/Insert Multiplexor/Demultiplexor shall comply with Section 6.0 of Special Specification Item, "Testing, Training, Documentation, Final Acceptance and Warranty". 6. 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. Payment. The 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 "D/I Muldem". This price shall be full compensation for all equipment described under this Item with all cables and connectors; and for furnishing all labor, materials, training and equipment necessary to complete the work