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How cascade connections operate
The method for cascading AdderView CATx units is straightforward
and requires no hardware settings or lengthy configuration process.
This is due to the Adder Port Direct communication system that
allows them to locate each other and share information.
The method of linking AdderView CATx units is the same
regardless of the cascade level, or number of devices attached. Put
simply:
• A single cascade link is made by connecting a computer
connections socket of one unit to a cAtx user ports
socket of the unit below it.
Such a single link would allow just one user from the higher
AdderView CATx unit to access any of the computer systems
attached to the lower one. However, a single link can cause
a bottleneck for multi-user systems so you are strongly
recommended to use a minimum of two or three links. Ideally quad
links should be used wherever possible as these allow four users to
simultaneously access computer systems situated anywhere within
the cascade tree.
When cascade links are made between units, each AdderView
CATx will automatically recognise the links and treat them
accordingly. The connections within dual, triple or quad cascade
links will then be allocated to users according to their general
availability in that group, not as specific individual lines. The
diagram here summarises the groups into which the ports are
arranged
When connecting links, ensure that you use the lowest numbered
ports in each group. For example, to create a triple cascade link in
group A, use ports 1, 2 and 3; for a double cascade link in group
B, use ports 5 and 6, etc. Unused ports in a group can be utilised
to connect directly to normal computers. The Adder Port Direct
system will automatically distinguish between the different types of
connections.
The central purpose of the link group system is that each user can
use a unique address to locate a particular computer. However, as
with the Internet, the route to get there could be slightly different
each time. This avoids any route blocking that could easily be
caused by other users occupying any specific link lines.
Note: Single, dual, triple and quad link groups may be mixed
on one unit providing the differing link groups lie within the
appropriate group boundaries shown opposite - see Tips for
successful cascading for more details.
20 12 419 11 318 10 217 9 1
24 16 823 15 7
22 14 6
21
13
5
COM2 / MODEM
KM
COMPUTER CONNECTIONS COMPUTER CONNECTIONS COMPUTER CONNECTIONS
GROUP AGROUP CGROUP E
GROUP F GROUP D GROUP B
Port groups for cascade links
(sixteen port models use groups A to D only)
See also
• Addressing computers in a cascade
• Connecting AdderView CATx units in cascade
• Testing specific links to cascaded computers