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7.5 8260 Ethernet 20/40-Port 10Base-T Module
The 8260 Ethernet 20-Port 10Base-T Module, a single-slot 20-port, and the 8260
Ethernet 40-Port 10Base-T Module, a two-slot 40-port are IEEE 802.3 repeater
modules that comply with the 10Base-T standard and support backbone and
to-the-desk connectivity over Unshielded Twisted Pair (UTP) as well as Shielded
Twisted Pair (STP) cabling. These modules provide 20 or 40 shielded RJ-45
connectors for attaching 10Base-T compliant devices using STP and/or UTP
cabling for distances of up to 100 m.
Note
You can mix UTP and STP cabling on a single 20/40-port 10Base-T module.
On the 20/40-port 10Base-T modules, all the ports are internally crossed-over
which allows you to connect them directly to 10Base-T transceivers without using
external crossover adapters.
These modules can also be used to provide UTP/STP backbone connections
between the 8260 and other 10Base-T compliant hubs such as another 8260, 8250
or 8224. In this case, an external cross-over adapter is required. As the STP
cabling is not part of the 10Base-T specification, when using STP cabling, you
must ensure that the hub at the other end is also capable of supporting STP
cabling.
The 24/40-port 10Base-T modules provide the following features:
•
Per-port switching
Each port can be connected to one of the eight segments on the backplane.
Also, the module provides eight isolated segments to which the individual
ports on the module can be attached. These isolated segments can be used
to set up segments consisting of the users attached to that module without
using any backplane resource.
Note
The 20/40-port 10Base-T modules support up to 8 segments
simultaneously. This means that the ports on these modules can be
connected to a maximum of 8 segments which can be a combination of
backplane and isolated segments.
•
Support for 2 E-MACs
These modules provide the mounting for two E-MACs. An E-MAC can be
assigned to any of the Ethernet segments on the backplane, or any of the
isolated segments on the module. Note that the E-MAC mounted on these
modules cannot collect per-port or per-module statistics about the 8250
modules.
•
Support for 1 Ethernet security card
In addition to mounting for two E-MACs, these modules provide the mounting
for one Ethernet security card. The Ethernet security card provides for
eavesdropping and intrusion control for your Ethernet segments. For
information about Ethernet security card, please refer to 7.11, “8260 Ethernet
Security Daughter Card” on page 121.
106 8260 Multiprotocol Intelligent Switching Hub