Electrical; Switch Features - 3Com 2924-SFP User Manual

Electrical

Switch Features

Table 11 Features of the Baseline Switch 2916-SFP Plus and Switch 2924-SFP Plus
Feature
Auto Negotiation
Automatic MAC Addresses Aging
Back Pressure
Line Frequency
Input Voltage
Current Rating
Switch 2916-SFP Plus
Switch 2924-SFP Plus
Maximum Power
Consumption
Switch 2916-SFP Plus
Switch 2924-SFP Plus
Max Heat Dissipation
Switch 2916-SFP Plus
Switch 2924-SFP Plus
This section describes the device features. The system supports the
following features:
Description
The purpose of auto negotiation is to allow a device to advertise modes of
operation. The auto negotiation function provides the means to exchange
information between two devices that share a point-to-point link
segment, and to automatically configure both devices to take maximum
advantage of their abilities.
Auto negotiation is performed totally within the physical layers during link
initiation, without any additional overhead to either the MAC or higher
protocol layers. Auto negotiation allows the ports to do the following:
Advertise their abilities
■
Acknowledge receipt and understanding of the common modes of
■
operation that both devices share
Reject the use of operational modes that are not shared by both
■
devices
Configure each port for the highest-level operational mode that both
■
ports can support
MAC addresses from which no traffic is received for a given period are
aged out. This prevents the Bridging Table from overflowing.
On half duplex links, the receiver may employ back pressure (i.e. occupy
the link so it is unavailable for additional traffic), to temporarily prevent
the sender from transmitting additional traffic. This is used to prevent
buffer overflows.
50/60 Hz
100–240 Vac (auto range)
1 Amp (Max)
1.5 Amp (Max)
58 Watts
84 Watts
198 BTU/hr
286 BTU/hr
Electrical 185