TOKEN RING FIBER EXTENDERS
19
Switch
Number
Name
Function
3
ACL
With ACL on, the Automatic Copper Loopback is
enabled. This is the phantom current based insertion
mechanism that operates in the standard way that a PC
adapter card inserts into a MAU. This is used in
conjunction with the NODE/CONC
(Node/Concentrator) switch to
provide controlled
insertion at either end of the link.
NODE with ACL ON when connected to a NODE or
station.
CONC with ACL ON when connected to a MAU lobe
port.
When connecting to the trunk of a Token Ring it is usual
to have ACL set to OFF, unless the MAUs are smart
MAUs that have a phantom current mechanism that
operates in the same manner.
Summary
ACL= ON for all lobe connections and trunk connections
that support the same phantom mechanism.
ACL= OFF for trunk (RI/RO) connections and 802.5c
(8230/CAU RI/RO) connections.
Note: When ACL is OFF the NODE/CONC switch has
no effect.