Altigen AltiContact Manager Version 5.0A, Руководство администратора

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Board Configuration
AltiContact Manager Administration Manual 6-23
6. Board
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Setting the Configurable Options
• For T1, you can set the Frame Type to either SF or ESF .
SF (Superframe Format) consists of twelve (12) consecutive frames.
ESF (Extended Superframe Format) consists of twenty-four (24)
consecutive frames.
For E1/PRI , you can set the Frame Type to either No CRC or CRC4 .
CRC4 is embedded into sixteen (16) consecutive frames.
• For T1, you can set the Line Code to either AMI or B8ZS .
AMI (Alternate Mark Inversion) is the line coding format in T1
transmission systems whereby successive ones (marks) are alternately
inverted and sent with opposite polarity of the preceding mark.
B8ZS
(Binary 8 Zero Substitution) sends two violations of the bipolar line
encoding technique, rather than inserting a one for every seven
consecutive zeros.]
For E1/PRI , you can set the Line Code to either AMI or HDB3 .
HDB3 (High Density Bipolar Order) is based on AMI, but extends this
by inserting violation codes whenever there is a run of four or more
zeros.
• You can set the Zero Code Suppression to None (default setting),
Jam Bit 8 , GTE or Bell .
Zero Code Suppression inserts a “one” bit to prevent the transmission
of eight or more consecutive “zero” bits; Jam Bit 8 forces every bit 8
to a one; GTE Zero Code Suppression replaces bit 8 of an all zero
channel byte to a one, except in signaling frames where bit 7 is forced
to a one.
Bell Zero Code Suppression replaces bit 7 of an all zero
channel byte with a one.
• CD Bits Handling is for display only.
• Use the Protocol button to invoke the T1 PRI or E1-R2 Protocol
Configuration window. The Triton T1/E1/PRI board can be
configured to either T1, ISDN PRI or E1-R2 through the configuration
options within the window.
• You can set the System Clock Master if you have a back-to-back
configuration and you want this span to be the master clock to the
system. (Only one clock master should be selected in a back-to-back
system.) See the following discussion.