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Siemens Saturn Iie Epabx General Description Manual

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    							SATURN IIE EPABX 
    General Description A30808-X5130-AllO-l-8918 
    Issue 1, May 1986 
    The system also includes two 5-l/4 inch floppy disk drives 
    (FDDs) with one megabyte of memory on each disk for generic 
    and customer data base backup and for CMU procedures. 
    The Remote Access Unit/Ports (RAUP) module has three (two 
    external) Electronics Industries Association RS-232-C serial 
    asynchronous ports. The two external ports are used for Sta- 
    tion Message Detail Recording (SMDR), traffic metering, 
    maintenance, and/or CMU features. The other port is dedi- 
    cated to the internal RAUP modem (self-setting to either 300 
    or 1200 baud, depending on the frequency received). Use of 
    the modem provides access for administration and main- 
    tenance from a remote service terminal. 
    The SWITCHING block is under the direction of the CON- 
    TROL block. It switches digital signaling data between the 
    LINE/TRUNK block and the CONTROL block and digital voice 
    message data between the SWITCHING block and the 
    LINE/TRUNK block. The SWITCHING block also distributes 
    coded digital control and status data to the CONTROL block 
    circuitry. 
    The Parallel/Serial Converter (PSC) converts the serial PCM 
    voice signals from the LTUs to eight-bit parallel bytes, which 
    are then multiplexed onto an eight-bit-wide parallel highway 
    and sent to the Memory Control and Attenuator (MCA) cir- 
    cuitry for further processing. The reverse function is also per- 
    formed to provide serial voice signals back to the LTUs. 
    The MCA is divided into two functional parts: a time switch 
    unit and the memory control. The time switch unit makes all 
    two-port connections and provides attenuation (as required) 
    for all calls being processed by the system. The memory con- 
    trol receives control data from the processor and causes the 
    time switch unit to make the required connections. 
    Another element of the SWITCHING block is the Conference 
    (CONF) circuit. The CONF circuit is required for simultane- 
    ous connections involving three to seven parties (plus the at- 
    tendant). 
    The POWER block of the SATURN IIE System makes use of 
    distributed power to ensure maximum efficiency and reliabil- 
    ity. The main POWER section is located on the bottom shelf 
    of the basic cabinet, and one LTU Power Supply (LTUPS) is 
    located next to the left end of each LTU shelf. The main POW- 
    ER section contains the Power System Unit (PSU) and either 
    one or two -48 Vdc power supplies (-48PS). One of the -48 
    Vdc power supplies comes with the basic cabinet of the 
    SATURN IIE System. The second -48 Vdc power supply is ad- 
    ded when the system is expanded to also contain the expan- 
    sion cabinet. The PSU contains an ac-dc power supply to 
    provide the +5, -5, +12, and -12 dc voltages used by the basic 
    shelf, a Ring Generator (RGEN), an optional Memory Sup- 
    port Module (MSM) with battery, a fuse/circuit-breaker panel, 
    and maintenance/power logic circuitry. 
    The ANCILLARY EQUIPMENT block contains the devices 
    which are external to the SATURN IIE System, such as a ter- 
    minal, the attendant console(s), and the individual telephone 
    sets and SDTs. Additional information regarding the ancillary 
    equipment is presented in Section 7 of this document. 
    2.04 Software Description. The SATURN IIE System uses 
    software-programmed switching. The system software is con- 
    tained in two basic areas: on-line (resident) and off-line (non- 
    resident and stored on two 5-l/4 inch floppy disks). The on-line memory is divided into three segments: the generic system 
    software, the customer memory, and an overlay area. Switch- 
    ing control, performed by the Central Processing Unit (CPU), 
    uses data which is stored in generic software. The software 
    that controls the activation of these features resides in the 
    customer memory area, and is alterable via the CMU proce- 
    dures. (The generic software may not be altered by the cus- 
    tomer.) The overlay area of memory contains the 
    administrative and maintenance programs, which are read in 
    from the 5-l/4 inch floppy disks for execution when required 
    by system craft personnel. 
    The SATURN IIE software is structured such that maintenance 
    and feature upgrade can be easily performed. The SATURN 
    IIE software uses state-event, device-oriented decision tables 
    with a single clock interrupt, event and common queues, and 
    multiple processing levels. A clock interrupt occurs every four 
    milliseconds in the system. These interrupts activate the 
    preprocessor software level which, in turn, processes any 
    change in state condition detected by the peripheral cards. 
    These changes are then queued for processing at the base 
    level processor. The queue is subject to the priority and func- 
    tion of the change. 
    If, for example, an off-hook state is detected by the preproces- 
    sor, it is sorted, prioritized, and queued for the base level 
    processor. After the action request is removed from the queue, 
    the base level processor verifies line appearance and class 
    of service. The base level processor then determines, via the 
    state-event table, the appropriate action required (e.g., to 
    return dial tone to the off-hook line appearance). The base 
    level processor then sends appropriate messages to form a 
    network connection between the line appearance and tone 
    generator circuit ports. 
    Note that dial tone is generated by the tone generator circuit. 
    The idle level processor (the third level) occurs when free (idle) 
    processing time is used for deferrable maintenance, adminis- 
    trative, and other background testing activities. 
    Since the features of the SATURN IIE System may be con- 
    trolled by the customer, an extremely flexible selection and 
    arrangement of the large number of features is possible. In 
    most cases, the features are provided and controlled exclu- 
    sively by the software routines and require no additional hard- 
    ware. These features may be added, changed, or deleted by 
    entering the appropriate input commands. In some cases, 
    hardware modifications may be required. These modifications 
    require the installation of one or more printed circuit boards 
    or modification of strapping on existing hardware. Activation 
    of the feature via software is done after completion of any such 
    hardware or wiring changes. 
    Software changes to the system may be made quickly and 
    with ease. The system accepts simplified, coded instructions 
    via a data entry terminal. The instructions are entered as al- 
    phanumeric keywords in response to plain English prompt- 
    ing by the system. 
    2.05 System Capacities and Specifications. This section 
    of the practice lists the various capacities and specifications 
    pertaining to the SATURN IIE System. The system capaci- 
    ties are outlined in Table 2.01. This table shows the various 
    quantities of stations, trunks, attendant consoles and other 
    related apparatus that are considered maximum for the 
    SATURN IIE System. Note that all system maximums are not 
    necessarily simultaneously available. 
    2-7  
    						
    							SATURN IIE EPABX A30808-X5130-AllO-l-B918 
    General Description Issue 1, May 1986 
    The system uses universal card slots to facilitate individual 
    system configuration engineering. 
    The SATURN IIE System is compatible with accepted North 
    American telephone industry standards. The system is fully 
    compliant with Federal Communications Commission require- 
    ments for connection of terminal equipment to the public telephone network. Table 2.02 lists some of the system trans- 
    mission characteristics. 
    The supervisory tones used in the SATURN IIE System (refer 
    to Table 2.03) conform to the North American Precise Tone 
    Plan. Certain timing.characteristics associated with various 
    tones can be changed by the customer. 
    Table 2.01 
    SATURN HE System Capacities and Specifications 
    NOTE: Not all maximums are applicable simultaneously. 
    TECHNOLOGY Pulse Code Modulation (PCM) and Time Division 
    Switching Techniques 
    AVAILABLE SWITCHING PORTS 
    Basic Cabinet 
    Basic Cabinet and Expansion Cabinet 224 Ports (Circuits), Basic Shelf 
    480 Ports (Circuits), Basic Shelf and One LTU Shelf 
    736 Ports (Circuits), One LTU Shelf in 
    Expansion Cabinet 
    992 Ports (Circuits), Two LTU Shelves in 
    Expansion Cabinet 
    POWER DISSIPATION 
    Basic Cabinet 
    Basic plus Expansion Cabinet 800 watts nominal 
    1600 watts nominal 
    CABINET SIZE 
    Width 
    Depth 
    Height 
    Basic Cabinet 
    Basic & Expansion Cabinet 107 cm (42 in.) 
    68.6 cm (27 in.) 
    111.7 cm (44 in.) 
    179 cm (70.5 in.) 
    CABINET WEIGHT 
    Basic Cabinet 
    Fully Loaded 
    Floor Loading 200 kg (440 Ibs) 
    268.5 kglsq m (55 lbslsq ft) 
    Basic & Expansion Cabinet 
    Fully Loaded 
    Floor Loading 
    CABINET CONTENTS: 
    Basic Shelf 
    Line/Trunk Unit Shelf 
    Floppy Disk Drive 311 kg (685 Ibs) 
    439 kg/sq m (90 Ibs/sq ft) 
    1: Standard 
    1 to 3: Optional 
    2: Standard 
    CABINET INPUT POWER REQUIREMENTS 
    Basic Cabinet 
    Basic and Expansion Cabinet 110 Vat, 60 Hz 
    110 Vat, 60 Hz, 14 Amperes 
    110 Vat, 60 Hz, 26 Amperes’ 
    TEMPERATURE: 
    Operating System 
    Storage 
    HUMIDITY: 
    Operating System 
    Storage 4O to 38O C (40° to 100’ F) 
    -40° to 66O C (-40° to 151” F) 
    20% to 80% (Noncondensing)“” 
    0% to 95% (Noncondensing) 
    ALTITUDE ABOVE SEA LEVEL: 
    Operating System 
    Storage 
    l Uses two ac input power cords Up to 3,048 meters (10,000 ft) 
    Up to 12,192 meters (40,000 ft) 
    l * Above 78 degrees F., humidity must be limited to the equivalent of 49% relative humidity at 100 degrees F. 
    2-8  
    						
    							. 
    SATURN IIE EPABX A30808-X5130-AllO-l-6918 
    General Description Issue 1, May 1986 
    Table 2.01 SATURN HE System Capacities and Specifications (Continued) 
    NOTE: Not all maximums are applicable simultaneously. 
    DTMF RECEIVERS 
    SWITCHING NETWORK TRAFFIC CAPACITY 
    TONE CHANNELS 
    INPUT/OUTPUT INTERFACES 32 
    36 CCS per port or 1 Erlang per port (non-blocking) 
    30 Available 
    3: RS-232-C 
    1: Modem 
    8-PORT CONFERENCE CIRCUITS 
    4-PORT CONFERENCE CIRCUITS 
    SYSTEM FEATURES 4 
    24 
    LEAST COST ROUTING 
    Area/Office Code Combinations 128,000 
    Specialized Common Carriers up to 3 
    Digit Number Analysis Full 
    Least Cost Routes 50 
    Trunk Group Elements Within a Route 8 
    Class-of-Service Priorities 16 
    Quantity of User On-Hook Queuing Callback Attempts 0 to 9 
    Dial Tone Detection Available Full 
    Time Bands Available 168 (Hour of Day & Day of Week) 
    Time Schedules Available 8 
    STATION MESSAGE DETAIL RECORDING 
    Call Buffers 255 
    Standard Account Codes - Numbers 255 
    Account Codes - Length 1 to 11 Digits per Code 
    NIGHT SERVICE 
    Zoned Universal Night Answer 
    l Number of Zones 4 
    l Trunks per Zone 100% 
    l Station Access per Zone 100% 
    Assigned Night Answer 
    l Trunk-to-Station Assignments 255 
    l LDN to ANA Assignments (for DID) 1 per DID Trunk Group 
    l Special Night Answer Position 1 Station or Hunt Group per System 
    VOICE MAIL INTERFACE 1 per System 
    CODE CALLING 
    Calling Channels 1 
    Answerback Channels Unlimited 
    AUTHORIZATION CODES 
    Direct Inward System Access/Mobile 
    Authorization Codes 2000 
    SHORT ANNOUNCEMENT SERVICE 
    Recorded Announcement Channels for ACD Groups 1 
    DIAL DICTATION 
    Channels 4 (Maximum) 
    ATTENDANT CONSOLE 
    NUMBER OF CONSOLES PER SYSTEM 
    ATTENDANT KEYS 
    Loop Keys 
    Fixed Function Keys 
    Assignable Function Keys 12 (Maximum) 
    4 
    12 
    18 
    (Rev. 5115186) 2-9  
    						
    							SATURN IIE EPABX 
    General Description A30808-X5130-AllO-143918 
    Issue 1, May 1986 
    Table 2.01 
    SATURN IIE System Capacities and Specifications (Continued) 
    NOTE: Not all maximums are applicable simultaneously. 
    ATTENDANT QUEUES 
    Operator Calls (Shared) 
    Incoming Calls (Shared) 
    Recalls (Shared) 
    Trunk Queuing Callback (Shared) 
    DISPLAYS AND INDICATORS 
    Number of Display Characters 
    Indicators per Function Key 
    Trunk Group Busy Indicators 
    Miscellaneous Indicators 
    ATTENDANT OVERFLOW FACILITY 
    Assigned Positions per System 
    DISTANCE FROM SYSTEM 
    TRUNKS 
    NUMBER OF TRUNK GROUPS PER SYSTEM 32  48 
    255 
    48 
    5 (per Console) 
    40 
    1 
    24 
    6 
    1 Station or 1 Hunt Group 
    610 Cable Meters (2000 Cable Feet) 
    NUMBER OF TRUNKS 
    Total Trunks per System 
    Total per Trunk Group 
    Dedicated Incoming Trunks 
    E&M Type Trunks 
    TRUNK GROUP CLASSES OF SERVICE 
    TRUNK GROUP IDENTITY CODES 
    Number Available 
    Characters per Code 
    ALTERNATE ROUTES PER TRUNK GROUP 255 
    100 
    255 
    255 
    1 per Trunk Group 
    1 per Trunk Group 
    8 
    3 (Without LCR) 
    8 Elements per Route with LCR 
    TRUNK PRIORITY LEVELS 
    (for Attendant Console Queuing) 
    DIRECT INWARD DIALING (DID) 
    DID Trunk Groups 
    Number of Digit Translation Tables 
    Digits Expected from Central Office 
    Digits Absorbed 
    Digits Prefixed 
    Digits Translated 
    Recorded Announcement Channels for Intercept 
    OUTGOING TRUNK QUEUING 32 
    32 
    4 
    2 to 5 
    0 to 3 
    oto2 - 
    2 (Maximum) 
    1 
    Trunk Groups Assigned with Outgoing Trunk Queuing 
    (Callback and/or Standby) 
    Simultaneous Station Queuing for a Trunk 
    (Callback and/or Standby Shared with Station 
    Automatic Callback) 
    STATIONS 32 
    80 
    CONVENTIONAL TELEPHONES 
    SIEMENS DIGITAL TELEPHONES 
    * 16 SLMD cards maximum per shelf. 992 (Maximum) 
    ‘512 (Maximum) 
    2-10  
    						
    							. . SATURN IIE EPAEX 
    General Description A30808-X5130-AllO-l-8918 
    issue 1, May 1986 
    Table 2.01 SATURN HE System Capacities and Specifications (Conticued) 
    NOTE: Not all maximums are applicable simultaneously. 
    STATION FEATURES 
    STATION CLASSES OF SERVICE 
    CODE RESTRICTION LISTS 
    Eight-Digit Lists 
    Eight-Digit Numbers 
    Fifteen-Digit Lists 
    Fifteen-Digit Numbers 
    HUNTING 
    Terminal Hunt Groups 
    Terminal Hunt Group Members 
    Circular Hunt Groups 
    Circular Hunt Group Members 
    Voice/Data Automa?ic Call Distribution 
    (ACD) Hunt Groups 
    Voice ACD Hunt Group Members 
    Data ACD Hunt Group Members 
    Pilot Number Access Hunt Groups 
    Pilot Number Access Hunt Group Members 
    CALL PARK 
    System Park Locations 
    Station Park Locatiohs (Call Hold) 
    CALL FORWARDING 
    Call Forwarding 
    - Variable 
    l Availability 
    l Simultaneously Active 
    Call Forwarding 
    - Busy Line 
    l Availability 
    l Simultaneously Active 
    Call Forwarding 
    - No Answer 
    l Availability l Simultaneously Active 
    Call Forwarding 
    - Secretarial Intercept 
    l Availability 
    l Simultaneously Active 
    l Answering Positions 
    Call Forwarding to Public Network 
    l Availability 
    l Simultaneously Active 
    l Digits per Network Number 
    CALL PICKUP 
    Dial Call Pickup Group 
    Members per Dial Call Pickup Group 
    Directed Call Pickup Availability 
    CONSULTATION, TRANSFER, AND 
    ADD-ON CONFERENCE 
    Availability 
    Simultaneous Consultations 
    Simultaneous Transfers 
    Simultaneous Add-On Conferences 32 
    16 
    16 per List Average (256 Flexible) 
    4 
    8 per List Average (32 Flexible) 
    Unlimited 
    30 per Group 
    Unlimited 
    30 per Group 
    64 
    96 per Group 
    96 per Group 
    Unlimited 
    30 per Group 
    10 
    1 per Station 
    100% of Lines 
    Unlimited 
    100% of Lines 
    Unlimited 
    100% of Lines 
    Unlimited 
    100% of Lines 
    Unlimited 
    64 
    100% of Lines 
    32 
    18 (Includes Access Code) 
    Unlimited 
    30 
    100% of Lines 
    100% of Lines 
    Unlimited 
    Unlimited 
    24 
    2-11  
    						
    							SATURN IIE EPABX 
    General Description A30808-X5130-AllO-l-6918 
    Issue 1, May 1986 
    Tabie 2.01 
    SATURN IIE System Capacities and Specifications (Continued) 
    NOTE: Not all maximums are applicable simultaneously. 
    S-i:TION FEATURES (Continued) 
    CALL WAITING 
    Call Waiting Originating 
    l Availability 
    Call Waiting Terminating 
    l Availability 
    Simultaneous Calls Waiting 
    l Per System 
    l Per Line 
    STATION CAMP-ON AND AUTOMATIC CALLBACK 
    Availability 
    Simultaneous Stations Queued for Callback 
    MESSAGE WAITING LAMPS ON STATIONS 
    Availability 
    Simultaneous Messages Waiting 
    e Number per System 
    l Per Conventional Telephone 
    l Per Siemens Digital Telephone (18- and 
    26-button) 100% of Lines 
    100% of Lines 
    100% of Lines 
    1 station & any number of trunks 
    100% of Lines 
    80 
    100% of stations 
    108 
    4 
    SPEED CALLING 
    Individual 
    l Lists per System 
    0 Numbers per List 
    l Digits per Number 
    l Availability 
    Group 
    * Lists per System 
    * Numbers per List 
    * Digits per Number 
    l Availability 
    System 
    LAST NUMBER REDIAL 
    Numbers Stored in System 
    Numbers Stored per Station 
    Digits per Number 
    Availability (Stations) 
    NONDIAL LINE SERVICES 
    Direct Attendant Signaling Lines 
    Switched Direct Line Service 
    Nondial Line Destinations 
    TEMPORARY CLASS-OFSCRVICE CHANGE 
    BY ATTENDANT 
    Simultaneously Active 
    SIEMENS DIGITAL TELEPHONES 64 
    10 
    18 
    1 Station per List 
    :4 
    18 
    100% per List 
    (See Speed Calling - Group) 
    255 
    1 
    18 
    255 
    100% of Stations 
    100% of Stations 
    32 
    Unlimited 
    Siemens Digital Telephone (SDT) “512 (Maximum) 
    Distinct Line Appearances 864 
    Buttons per Station 16, 18, or 26 
    Button Appearances per Line 8 
    Button Maps per System 32 
    Distance from System 610 Cable Meters (2,000 Cable Feet) 
    + 16 SLMD cards maximum per shelf.  
    						
    							SATURN IIE EPABX 
    General Description A30808-X5130-AllO-l-8918 
    Issue 1, May 1986 
    Table 2.02 Input/Output Impedance, Leak Resistance, and Loop Characteristics 
    INPUT/OUTPUT IMPEDANCE 
    Lines 
    Trunks (Strappable) 600 ohms, nominal 
    600 ohms, or Bell City Trunk Termination 
    (OPS Compromise Network) 
    LOOP CHARACTERISTICS 
    Stat;at;l;nterfaced via SLMA-S or SLA16 1,200 ohms, maximum loop resistance, 
    including telephone 
    15,000 ohms minimum leak resistance 
    Stations interfaced via 
    l SLMA-0 Module 1,800 ohms, maximum loop resistance 
    30,000 ohms minimum leak resistance 
    Central Office Trunks 
    via TMBM Module 1,200 ohms, maximum loop 
    resistance, with 48-volt (nominal) battery 
    30,000 ohms minimum leak resistance 
    Direct Inward Dial Trunks 2,450 ohms, maximum loop resistance 
    via TMIE Module 30,000 ohms minimum leak resistance 
    * SLMA-0 module is registered with FCC for Class C operation 
    Tone Name 
    Dial Tone 
    Reorder Tone 
    Busy Tone 
    Audible Ring Tone 
    Recall Dial Tone 
    Special Audible Ring Tone 
    Intercept Tone 
    Call Waiting Tone(s) 
    Busy Override Tone 
    (also, Attendant 
    Override Tone) 
    Executive Override Tone 
    Confirmation Tone 
    Camp-On Tone (also, Low 
    Tone or Uninterrupted 
    BusyTone) Table 2.03 SATURN IIE Supervisory Audible Tones 
    Frequency 
    350 + 440 Hz 
    480 + 620 Hz 
    480 + 620 Hz 
    440 + 480 Hz 
    350 + 440 Hz 
    440 + 620 Hz 
    440 + 620 Hz 
    440 Hz 
    440 Hz 
    440 Hz 
    350 + 440 Hz 
    480 + 620 Hz Timing Rate 
    Steady tone. 
    Repetition of tone ON for 0.25 second and tone OFF for 
    0.25 second. 
    Repetition of tone ON for 0.5 second and tone OFF for 
    0.5 second. 
    Repetition of tone ON for 0.8 - 1.2 seconds and tone 
    OFF for 2.7 - 3.3 seconds. 
    Three bursts of tone ON for 0.08 - 0.12 second and tone 
    OFF for 0.08 - 0.12 second, followed by dial tone. 
    Repetition of combined tone ON for 0.8 - 1.2 seconds, 
    followed by 440 Hz tone ON for 0.2 second and tone 
    OFF for 2.7 - 3.3 seconds. 
    Repetition of alternating the two frequencies, each ON 
    for 0.16 - 0.3 second, with a total cycle duration of 0.5 
    second. 
    One burst of tone ON for 0.1 - 0.3 second for a waiting 
    station call. Two bursts of tone ON for 0.1 - 0.3 
    second apart for a waiting attendant or trunk call. 
    Three bursts of tone ON for 0.25 second and tone OFF 
    for 1.75 seconds, followed by attendant connection. 
    One burst of tone ON for 2.0 - 4.0 seconds before 
    overriding station intrudes. 
    Three bursts of tone ON for 0.08 - 0.12 second, 
    0.08 - 0.12 second apart. 
    Steady tone.  
    						
    							SATURN IIE EPABX 
    General Description A30808-X5130-AllO-l-8918 
    issue 1, May 1986 
    Table 2.03 SATURN IIE Suoervisorv Audible Tones (Continued1 
    Tone Name 
    Invalid Camp-On Tone Frequency 
    480 + 620 Hz Timing Rate 
    Repetition of tone ON for 0.125 second and tone OFF 
    for 0.125 second. 
    Conference Tone 440 Hz One burst of tone ON for 0.4 - 0.6 second, followed by 
    conferee connection. 
    Quiet Tone 0 Hz Steady tone. 
    Busy Override Injection 440 Hz Bursts of tone ON for 0.25 second, 8 - 20 seconds 
    Tone (also, Privacy Tone) apart, applied while an overriding party is present 
    on a connection 
    Route Advance Tone 
    (for Least Cost Routing 
    - LCR) 350 + 440 Hz One burst of tone ON for 0.08 - 0.12 second. 
    Warning Tone 
    (also, Expensive 
    Facility Tone - LCR) 440 Hz One burst of tone ON for 0.8 - 0.12 second. 
    Test Tone 
    Negative 
    Acknowledgement 
    (NAK) Tone 1004 Hz 
    480 + 620 Hz Steady tone. 
    1.5 seconds (i.e., three cycles) of reorder tone.  
    						
    							SATURN IIE EPABX A30808-X5130-AllO-l-8918 
    General Description 
    Issue 1, May 1986 
    SECTION 3.00 SATURN IIE EQUIPMENT CABINET 
    3.01 Cabinet Layout. The SATURN IIE System consists of 
    either a basic cabinet only (Figure 3.00) or a basic cabinet 
    plus an expansion cabinet as shown in Figures 3.01 and 3.02. 
    The basic cabinet contains an LTU shelf, a basic shelf, and 
    an area at the bottom of the cabinet where the main power 
    section and floppy disk drives are located. 
    The basic shelf is always equipped in the system. It contains 
    all the PCBs that make up the common control and switch- 
    ing circuitry for the SATURN IIE System, plus seven LTU chan- 
    nel groups containing 224 port circuits. 
    One LTU shelf may optionally be equipped in the basic cabi- 
    net. It provides an additional 256 ports in eight channel groups 
    for a total of 480 ports in the basic cabinet. This LTU shelf 
    requires an LTU Power Supply (LTUPS). 
    The expansion cabinet, which mounts on top of the basic cabi- 
    net, expands the basic cabinet by either one or two addition- 
    al LTU shelves (Figures 3.01 and 3.02). Each of these shelves 
    has its own LTUPS and provides eight channel groups for a 
    total of 256 ports per shelf. Thus, when the expansion cabi- 
    net is added, the expanded system may have a total of either 
    736 or 992 ports. When the expansion cabinet is added, the 
    top cover is removed from the basic cabinet and reinstalled 
    as the top cover of the expansion cabinet. The LTU portion of the system is arranged in channel groups 
    of 32 channels each, one channel being used for each port. 
    Each channel group consists of universal card slots. Some 
    of the channel groups contain four card slots each, and the 
    others contain two card slots each. Each card in a channel 
    group contains either two, four, eight, or sixteen circuits, de- 
    pending on the card type. Each circuit uses one port on the 
    system (except in the case of the PIMD card, each circuit of 
    which takes up two ports). 
    The main power section is located at the bottom of the cabi- 
    net. This section contains the Power System Unit (PSU), one 
    or two -48 Vdc power supplies depending upon whether or 
    not the expansion cabinet is equipped, and the two FDDs re- 
    quired by the system. The following units are housed within 
    the PSU: 
    a. 
    acldc power supply to supply +5, -5, +12, and -12 Vdc 
    to the basic shelf. 
    Ring generator. 
    Memory Support Module (MSM), optional, with battery. 
    Fuse/circuit breaker panel 
    Control Logic PCB.  
    						
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