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Chapter 5: Configuration
BONDING SETUP
The ISU 512 communicates with many different types of telecommunication
equipment including other ISU 512s, ISDN terminal adapters, Switched 56
DSUs, and BONDING mode 1-compatible inverse multiplexers. The ISU 512
supports the BONDING mode 1 (Bandwidth on Demand Interoperability
Group) adaptation protocol.
See Recommended Operating Protocols in this chapter for more information on
recommended modes of operation.
The BONDING mode 1 protocol allows the ISU 512 to communicate at bit rates
in excess of 64 kbps to a maximum of 512 kbps. BONDING provides high-
speed communication between ISU 512s, ISDN TE/TAs, and inverse multi-
plexing equipment supporting the BONDING protocol. The protocol allows
use of synchronous bit rates. When the ISU 512 uses the BONDING mode 1
protocol, up to eight separate ISDN phone calls are required to seize control of
all ISDN bearer channels. The protocol corrects any delays existing between
the bearer channels and presents a single high-speed data channel to the DTE.
For successful high-speed operation, both the near and far-end DCE need to
be configured to use the BONDING mode 1 protocol. The BONDING mode 1
protocol negotiation phase has numerous timers to allow transmission delays
due to satellite hops, international calls, etc.
3=CONFIG
TXINIT
This option specifies the length of time the originating endpoint attempts to
detect the BONDING negotiation pattern from the answering endpoint before
deciding the BONDING call has failed. In general, this timer value should be
left at the factory default setting of 10 seconds. Select from values of 1, 2, 5, 10
(default), 20, 50, 100, and 200 seconds.
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3=BONDING setup
1=TXINIT
2=TXFA
3=TXADD01
4=TXDEQ
5=TANULL
6=TCID
7=CALL STAGGER
ISU 512 User Manual
61202.086L1-1
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