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Chapter 1:
Introduction
1-4 6H122-08 User’s Guide
1.3 6H122-08 OVERVIEW
The 6H122-08 is a Fast Ethernet interface module for Cabletron Systems
6C105 chassis that has six RJ45 switched ports and two optional Fast
Ethernet Interface Module ports (100BASE-TX and 100BASE-FX) that
provide Twisted Pair, Multimode, and Single Mode Fiber Optic cabling
connectivity.
The 6H122-08 is used to connect individual high-bandwidth user devices,
such as workstations, and provide a central switching point for multiple
10/100 Mbps Fast Ethernet segments.
1.3.1 Auto-Negotiation
Twisted Pair ports on the 6H122-08 module have the ability to
auto-negotiate the type of connection required to provide a link to another
device. During Auto-Negotiation, two devices automatically exchange
information “telling” each other what their operating capabilities are. The
Auto-Negotiation feature targets the maximum capabilities that can be
reached between the two devices. For example, the 6H122-08 adjusts to
100 Mbps when the device on the other end of the connection can also
adjust between 10 Mbps or 100 Mbps. If the device on the other end of
the connection can only operate at 10 Mbps, then the 6H122-08 adjusts to
10 Mbps operation.
When Auto-Negotiation is supported at both ends of a link, the two
devices dynamically adjust to full or half duplex operation based on the
maximum capability that can be reached between the two devices. If the
device connected to the 6H122-08 cannot auto-negotiate, the 6H122-08
interface operates according to the capabilities of the other device.
1.3.2 Connectivity
The 6H122-08 connects to Ethernet networks or workstations through six
RJ45 ports on the front panel. These ports support Category 5 Unshielded
Twisted Pair cables with an impedance between 85 and 111 ohms. These
ports are IEEE 802.3u 100BASE-TX compliant.
The 6H122-08 has two front panel slots (ports 7 and 8) for optional Fast
Ethernet Interface Modules (FE-100TX, FE-100FX, and FE-100F3) to
support an uplink to 100 Mbps Ethernet backbones or a high speed
connection to a local server using Twisted Pair, Multimode or Single
Mode Fiber Optic cabling.