DUA1800-0AAA04
Introduction 3-5
Partitioning of a segment from the rest of the network will o ccur
if the module detects thirty-two consecutive collisions on a
segment or if it detects a single collision of betwee n 1,000 and
30,000 bit times.
Once a segment has been partitioned, the module will pass
network traffic onto the segment; but will not accept anything
from the segment for transmission to the rest of the network.
When a good packet is detected on the partitioned port, it will
automatically reconnect the port.
■Isolation: Modules can be isolated from the backplane and
therefore all other modules in the M SH chassis via a configurable
jumper. In Isolation mode, a module acts as a repeater for only
the segments attached to that module and data is not repeated
over the backplane. A module operating in Isolation mode does
not affect data travelling between the other slots in t he MSH
chassis. Isolated modules ca n still be managed by the
management module.
■Port Disable On Power-up: This feature can be used as a
first-line security feature. Configurable jump ers mounted on the
module allow you to set ports to power-up in a disabled state.
This prevents unauthorized user s from accessing your network via
unused ports.
If necessary, you can then enable these ports individu ally using a
management facility.
■LAN Security Architecture (LSA): A specific non-smart secure
module is supplied to support LSA. This provides twelve 10Base-T
ports over a 50-way telco connector. If LSA is needed over Optical
Fiber or AUI, the relevant secure ECS module fitted with a
converter can be used. Alternatively, you may fit a transceiver
module of the required connectivity to a secure MSH module.
LSA may be enabled or disabled using hardware links or Network
Manager.
When enabled, LSA operates in two ways to give you assurance
that your network is not being accessed by unauthorized users.
Chassis.bk : CHAPTER3 Page 5 Monday, February 10, 1997 1:11 PM