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3-2 C
HAPTER
3: I
NSTALLING
M
ODULES
I
NTO
T
HE
MSH C
HASSIS
DUA1800-0AAA04
A Quick Check Before You Install Modules
As mentioned before you can insert up to eleven modules of
mixed media into the LinkBuilder MSH. The range of modules
that are available from 3Com allows many combinations and
permutations for a mixed media network.
However, you should check before installing the modules that the
total power and current consumptions required by the
combination of modules does not exceed the limits given in
Appendix C. These limits have been set to support a fault tolerant
power supply in the MSH chassis.
Ethernet Modules
Repeater Modules
Repeater modules provide all the standard functions within an
802.3 Repeater including the following:
■
Frames are regenerated and retimed, allowing them to be
transmitted further than the maximum length of a single cable
segment.
■
Fragment extension extends undersized collision fragments so
that they can be detected by devices throughout the network.
■
Jabber lock-up protection prevents transceivers attached to the
MSH from locking up in the case of devices jabbering (jabbering is
the uncontrolled transmission of oversized frames to the
network).
The diagram opposite shows the functional blocks that make up
an Ethernet module
.
Chassis.bk : CHAPTER3 Page 2 Monday, February 10, 1997 1:11 PM