Technical Description of
TANDBERG Gateway
with software version G2
D13192 Rev. 02
20
4.2
Aggregation Standards
ISDN Aggregation
H.221
Frame Structure from 64 (56
*
) kbps to 128 kbps
ISO 13871
BONDING, Mode 1 from 64 (56
*
) kbps to 2 Mbps
H0
One
384
kbps
channel
4.2.1
BONDING
•
ISO 13871, BONDING Mode 1 for bit rates from 56 kbps up to 2 Mbps (1 to 30 channels).
•
The maximum relative delay difference between B-channels is 0.5 second (i.e. to compensate
for different routing of channels).
The following are the standard bandwidths on H.320:
30ch – 24 – 23 – 18 – 12 – 8 – 6 – 5 – 4 – 3 – 2 – 1
4.2.1.1
ISDN channel set-up
The following is a description of how the ISDN channels are set up.
Incoming & Outgoing TANDBERG Gateway calls: Normally the TANDBERG Gateway will
set up only 1 channel from PRI 1 and build up the channels starting from the 'bottom' of the last
PRI in use.
This will ensure that the TANDBERG Gateway always have available channels on the first PRI
number (which normally should be the TANDBERG Gateway 's main number).
4.2.2
H.221
•
For bit rates from 56 kbps up to 128 kbps (1 or 2 channels).
•
The maximum relative delay difference between the 2 B-channels is 0.6 second.
4.2.3
H0
H0 is an ITU defined 384 kbps service available for ISDN PRI. The TANDBERG Gateway
supports H0 on incoming ISDN calls. H0 is defined as a group of 6 ISDN channels multiplexed
to provide one 384 kbps channel. H0 may have a shorter connection time, since there is only
one channel to set up.
This service is sometimes called
Switched 384
or
ISDN H0
.
