7.2 8260 Ethernet 24-Port 10Base-T Module
The 8260 Ethernet 24-Port 10Base-T Module is a 24-port IEEE 802.3 repeater
module that complies with the 10Base-T standard and supports backbone and
to-the-desk connectivity over Unshielded Twisted Pair (UTP) cabling. This
module provides two 50-pin Telco-type connectors. Each Telco-connector can be
connected to an external 12-port

harmonica

. Each port on the harmonica
provides an RJ-45 connector for attaching 10Base-T compliant devices using UTP
cabling for distances of up to 100 m.
Note that all 24-ports are internally crossed-over which allows you to connect
them directly to 10Base-T transceivers without using external crossover
adapters.
The 8260 Ethernet 24-Port 10Base-T Module can also be used to provide a UTP
backbone connection between the 8260 and other 10Base-T compliant hubs such
as another 8260, 8250 or 8224. I n this case, an external crossover adapter is
required.
Note that because of limited achievable distances, the UTP backbone is not
recommended. Instead, you are advised to use a fiber (10Base-FL or
10Base-FB) module for backbone connectivity.
The 8260 Ethernet 24-Port 10Base-T Module provides 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 8260 Ethernet 24-Port 10Base-T Module supports up to 6 segments
simultaneously. This means that the ports on this module can be
connected to a maximum of 6 segments which can be a combination of
backplane and isolated segments.
•Support for 1 E-MAC
This module provides the mounting for one E-MAC. The E-MAC can be
assigned to any of the Ethernet segments on the backplane, or any of the
isolated segments on this module. Note that the E-MAC mounted on this
module cannot collect per-port or per-module statistics about the 8250
modules.
•Support for 1 Ethernet Security Card
In addition to mounting for the E-MAC, this module provides the mounting for
one Ethernet security card. 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.
•Support for port redundancy
You can set up redundancy between two links on the same module or two
different modules. Note that port redundancy is supported between different
Chapter 7. 8260 Ethernet Modules 99