Switch Architecture; Power-Over-Ethernet Capability; Network Management Arrangement - AMX NXA-ENET24 Hardware Installation Manual

Introduction
All the 10BASE-T/100BASE-TX ports on this switch support IEEE 802.3af standard Power-over-Ethernet
capabilities. Each port can detect connected 802.3af-compliant network devices, such as AMX's NXA-WAP
200 G, other third party's wireless access points or IP phones, and automatically supply the required DC
power.
As well as its Power-over-Ethernet capabilities, the switch provides comprehensive network management
features, and is specifically designed to provide reliability and consistent performance for audio/video streams
coming from AMX's MAX units.

Switch Architecture

The switch employs a wire-speed, non-blocking switching fabric. This permits simultaneous wire-speed
transport of multiple packets at low latency on all ports. The switch also features full-duplex capability on all
ports, which effectively doubles the bandwidth of each connection.
The PoE switch uses store-and-forward switching to ensure maximum data integrity. With store-and-forward
switching, the entire packet must be received into a buffer and checked for validity before being forwarded.
This prevents errors from being propagated throughout the network.
This switch includes two Gigabit combination ports with RJ-45 connectors and associated SFP slots.

Power-over-Ethernet Capability

The NXA-ENET24-PoE's 24 10/100 Mbps ports support the IEEE 802.3af Power-over-Ethernet (PoE)
standard that enables DC power to be supplied to attached devices using wires in the connecting Ethernet
cable. Any 802.3af compliant device attached to a port can directly draw power from the switch over the
Ethernet cable without requiring its own separate power source. This capability gives installers greater
flexibility in deployment locations for devices such as IP cameras and wireless access points, which translates
into greater network availability.
For each attached 802.3af-compliant device, the switch automatically senses the load and dynamically
supplies the required power. The switch delivers power to a device using the two wire pairs in UTP or STP
cable that are not used for 10BASE-T/100BASE-TX connections. Each port can provide up to 15.4 W of
power at the standard -48 DC voltage. Independent overload and short-circuit protection for each port allows
the switch to automatically shut down a port's power when limits are exceeded.
Network devices such as IP phones, wireless access points, and network cameras, typically consume less than
10 W of power, so they are ideal for Power-over-Ethernet applications.

Network Management Arrangement

With a comprehensive arrangement of LEDs, this switch provides "at a glance" monitoring of network and
port status. The switch can be managed over the network with a web browser Telnet application, or via a direct
connection to the console port. The switch includes a built-in network management agent that allows it to be
managed in-band using SNMP or RMON (Groups 1, 2, 3, 9) protocols. It also has an RS-232 serial port (DB-
9 connector) on the front panel for out-of-band management. A PC may be connected to this port for
configuration and monitoring out-of-band via a null-modem serial cable.
For a detailed description of the advanced features, refer to the NXA-ENET24 Managed Ethernet Switches
Software Management Guide (available at www.amx.com).
The switch uses DVMRP protocol to determine the routing for multicast packets. If no hosts have subscribed
to the indicated multicast service, the packet will be dropped.
8 NXA-ENET24 Hardware Installation Guide