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