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Multi-Tech Systems Mvp-2400/2410/3010, Mvp-210/410/810 Voice/ip Gateways S000249C User Guide

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    							MultiVOIP User Guide Technical Configuration (Digital)
    111
    Voice/Fax Parameter Definitions (cont’d)
    Field Name Values Description
    Dynamic Jitter
    Maximum
    Jitter Value60 to 400
    msThe default maximum dynamic
    jitter buffer of 300 milliseconds is
    the maximum delay tolerable over a
    high jitter network.
    Default = 300 msec
    Optimizat-
    ion Factor0 to 12 The Optimization Factor
    determines how quickly the length
    of the Dynamic Jitter Buffer is
    changed based on actual jitter
    encountered on the network.
    Selecting the minimum value of 0
    means low voice delay is desired,
    but increases the possibility of jitter-
    induced voice quality problems.
    Selecting the maximum value of 12
    means highest voice quality under
    jitter conditions is desired at the
    cost of increased voice delay.
    Default = 7. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    112
    Voice/Fax Parameter Definitions (cont’d) )  
    Field Name Values Description
    Auto Disconnect
    Automatic
    Disconnect-
    ion-- The Automatic Disconnection
    group provides four options which
    can be used singly or in any
    combination.
    Jitter Value 1-65535
    milli-
    secondsThe Jitter Value defines the average
    inter-arrival packet deviation (in
    milliseconds) before the call is
    automatically disconnected. The
    default is 150 milliseconds. A higher
    value means voice transmission will
    be more accepting of jitter. A lower
    value is less tolerant of jitter.
    Inactive by default. When active,
    default = 150 ms.  However, value
    must equal or exceed Dynamic
    Minimum Jitter Value.
    Call
    Duration1-65535
    secondsCall Duration defines the
    maximum length of time (in
    seconds) that a call remains
    connected before the call is
    automatically disconnected.
    Inactive by default.
    When active, default = 180 sec.
    This may be too short for most
    configurations, requiring upward
    adjustment.
    Consecutive
    Packets Lost1-65535Consecutive Packets Lost defines
    the number of consecutive packets
    that are lost after which the call is
    automatically disconnected.
    Inactive by default.
    When active, default = 30
    Network
    Discon-
    nection1 to 65535
    seconds;
    Default =
    300 sec.Specifies how long to wait before
    disconnecting the call when IP
    network connectivity with the
    remote site has been lost. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    113
    9. Set T1/E1/ISDN Parameters.  This dialog box can be reached by
    pulldown menu, toolbar icon, keyboard shortcut, or sidebar.
    Accessing “T1/E1/ISDN Parameters”
    Pulldown Icon
    Shortcut Sidebar
         Ctrl + T 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    114
    In each field, enter the values that fit  your particular network. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    115
    T1 Parameters.  The parameters applicable to T1 and their values are
    shown in the figure below.  These T1 Parameter fields are described in
    the tables that follow. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    116
    T1 Parameter Definitions
    Field Name Values Description
    T1/E1/ISDN T1 North American standard.
    Long-Haul
    ModeY/N In Long-Haul Mode, the
    MultiVOIP auto-matically
    recovers received signals as low
    as –36 dB.  The maximum
    reachable length with 22 AWG
    cable is 2000 meters.  When
    Long-Haul Mode is disabled,
    signals as low as –10 dB can be
    received.
    Default: disabled.
    CRC Check
    (Cyclic
    Redundancy
    Check)Y/N When enabled, allows
    generation and checking of
    CRC bits.  If not enabled, all
    check bits in the transmit
    direction are set.  Only applies
    to ESF frame format.
    Default: enabled.
    Frame Format
    F4, D4, ESF,
    SLC96Frame Format of MultiVOIP
    should match that used by PBX
    or telco. ESF and D4 are
    commonly used. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    117
    T1 Parameter Definitions (cont’d)
    Field Name Values Description
    CAS Protocol E&M Immed Strt
    E&M Wink Start
    E&M Wink with
    dial tone
    FXO Ground Strt
    FXO Loop Start
    FXS Ground Strt
    FXS Loop StartChannel Associated Signaling
    (CAS) is a method of
    incorporating telephony
    signaling info into a T1
    voice/data stream.  In CAS, the
    signaling bits (the A, B, C, and
    D bits) are multiplexed into the
    signal stream of each T1
    channel.  (By contrast, in
    Common Channel Signaling
    (CCS), one channel handles
    signaling for all other channels.)
    Each CAS protocol defines the
    states of the signaling bits
    during the various stages of a
    call (IDLE, SEIZED, ANSWER,
    RING-ON, RING-OFF).
    The CAS protocol code allows
    the VOIP to  interact properly
    with the PBX or central-office
    switch that it serves.  The need
    to download CAS protocols
    arises for only a small minority
    of VOIP users, and only when
    PBX/switch is found to be
    incompatible with standard
    protocols.
    Match this parameter to the
    setting of PBX or central-office
    switch. 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    118
    T1 Parameter Definitions (cont’d)
    ISDN Parameters
    Field Name Values Description
    Enable
    ISDN-PRIY/N
    If digital connection is ISDN-
    PRI type, this box should be
    checked. When ISDN is
    enabled, the “CAS Protocols”
    field is grayed out (ISDN has its
    own signaling method).
    Terminal/
    Networkeither
    “Terminal” or
    “Network”When “Terminal” is selected, it
    indicates that the MultiVOIP
    should emulate the subscriber
    (terminal) side of the digital
    connection.  When “Network”
    is selected, it indicates that the
    MultiVOIP should emulate the
    central office (network) side of
    the digital connection.
    Setting used for MultiVOIP
    must be opposite to the setting
    used in the PBX.  For example,
    if the PBX is set to “Terminal,”
    then the MultiVOIP must be set
    to “Network.”
    Country see table, later
    this chapterCountry in which MultiVOIP is
    operating with ISDN.
    Operator
    see table, later
    this chapterIndicates phone switch
    manufacturer/model or refers
    to telco so as to specify the
    switching system in question.
    ISDN is implemented
    somewhat differently in
    different switches.
    Note on
    Country &
    Operator
    options.__
    [ISDN implementation options
    are shown, arranged by
    country, in a table below – soon
    after E1 Parameter Definitions.] 
    						
    							MultiVOIP User Guide Technical Configuration (Digital)
    119
    T1 Parameter Definitions (cont’d)
    Field Name Values Description
    Line Build Out 0 dB,  -7.5 dB,
    -15 dB, -22.5 dBTo reduce the crosstalk on
    received signals, a transmit
    attenuator can be placed in the
    data path.  Transmit attenuation
    is selectable.  Default: O dB
    Pulse Shape
    Level0 to 40 Meters
    40 to 81 m
    81 to 122 m
    122 to 162 m
    162 to 200 mRefers to length of cable
    between MultiVOIP and
    PBX/telco in meters. Most
    common will be 0 to 40m.
    Clocking External/Internal
    Set opposite to telco/PBX
    setting.  Example: if telco
    clocking internal, set VOIP
    clocking as external.
    Line Coding AMI / B8ZS Match to PBX or telco.
    PCM Law A-Law/Mu-Law Match to PBX or telco. “
    Mu-law” is analog-to-digital
    compression/expansion
    standard used in North
    America. “A-law” is European
    standard.
    Yellow Alarm
    FormatBit 2 / 1111… Depending on the Frame
    Format used, there are choices
    of Yellow Alarm format, as
    follows:
    D4: -Bit2 = 0 in every speech
    channel
    -FS bit of frame 12 is forced
    to one.
    ESF: -Bit2 = 0 in every speech
    channel
    –1111111100000000 pattern
    in data link channel.
    Check with your PBX/telco
    administrator for the correct
    setting or use the default value
    (1111 … ). 
    						
    							MultiVOIP User Guide Technical Configuration (Digital Voips)
    120
    E1 Parameters.  The parameters applicable to E1 and their values are
    shown in the figure below.  These E1 Parameter fields are described in
    the tables that follow. 
    						
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