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

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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. 
						

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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. 
						

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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 
						

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In each field, enter the values that fit  your particular network. 
						

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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. 
						

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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. 
						

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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. 
						

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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.] 
						

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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 … ). 
						

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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.