HP 9000 Series Instruction Manual

16 Chapter1
Installing and Configuring 10/100Base-TX/9000
Compatibility and Installation Requirements
Autonegotiation and Autosensing
Autonegotiation is a mechanism defined in the IEEE 802.3u specification
whereby devices sharing a link segment can exchange information and
automatically configure themselves to operate at the highest capability
mode shared between them.
Autonegotiation is likea rotary switch that automatically switches to the
correct technology such as 10Base-T or 100Base-TX or between half- and
full-duplex modes. Once the highest performance common mode is
determined, auto-negotiation passes control of the link to the
appropriate technology, sets the appropriate duplex mode, and then
becomes transparent until the link is broken.
Following is the IEEE 802.3u-defined hierarchy for resolving multiple
common abilities for a 10/100Base-TX card. The HP-PB
10/100Base-TX/9000 product provides the means for interfacing various
types of HP 9000 workstations to either a 10Base-T or 100Base-TX
network. 100Base-TX is a subset of 100Base-T networking defined by the
IEEE 802.3u-1995 standard. 100Base-TX provides 100 Mbit/s data
transmission over category 5 unshielded twisted-pair (UTP) cable. Two
pairs of wires in the cable are used—one wire pair is for receiving data,
and one wire pair is for transmitting data. The same card port that
supports 100Base-TX operation can also support 10Base-T operation.
• 100Base-TX half duplex
• 10Base-T full duplex
• 10Base-T half duplex
• 100Base-TX full duplex
For example, if both devices on the link support 10Base-T (half duplex)
and 100Base-TX (half duplex), autonegotiation at both ends will connect
the 100Base-TX (half duplex) instead of the 10Base-T (half duplex).
Most Fast Ethernet devices on the market today such as hubs and
switches do not support autonegotiation. Either the speed and duplex
mode of the device are fixed (as is usually the case with hubs), or they are
often manually configured at the desired speed and duplex (as is often
the case for switches). However, switches that support autonegotiation
are starting to be offered.
If the HP-PB 10/100Base-TX/9000 card is connected to a device, such as
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HP 9000 Series Specifications

General

Operating System	HP-UX
Manufacturer	Hewlett-Packard (HP)
Series	9000
Type	Server
Processor	PA-RISC
Memory	Varies by model
CPU	PA-RISC processors
Expansion Slots	Varies by model
Networking	Ethernet
Form Factor	Rackmount
Models	A-Class, D-Class, E-Class, K-Class, N-Class, RP Series, Superdome