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Introduction
Management Options
This switch contains a comprehensive array of LEDs for "at-a- glance" monitoring of
network and port status. It also includes a built-in network management agent that
allows the switch to be managed in-band using SNMP or RMON (Groups 1, 2, 3 and
9) protocols, with a Web browser, or remotely via Telnet. It provides 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
cable. (See Appendix B for wiring options.)
For a detailed description of the advanced features, refer to the Management Guide.
Description of Hardware
SFP Slots
The ES4612 contains 12 Small Form Factor Pluggable (SFP) transceiver slots, four
of which are shared with RJ-45 ports 9-12. In its default configuration, if an SFP
transceiver (purchased separately) is installed in a slot and has a valid link on its
port, the associated RJ-45 port is disabled and cannot be used. The switch can also
be configured to force the use of an RJ-45 port or SFP slot, as required.
1000BASE-T Ports
The ES4612 contains four RJ-45 ports that are shared with SFP slots 9-12. These
RJ-45 ports operate at 10 Mbps or 100 Mbps, half or full duplex, or at 1000 Mbps,
full duplex. Because all RJ-45 ports on this switch support automatic MDI/MDI-X
operation, you can use straight-through cables for all network connections to PCs or
servers, or to other switches or hubs. (See "1000BASE-T Pin Assignments" on page
B-3.)
Each of these ports support auto-negotiation, so the optimum transmission mode
(half or full duplex), and data rate (10, 100, 1000 Mbps) can be selected
automatically. If a device connected to one of these ports does not support
auto-negotiation, the communication mode of that port can be configured manually.
Each port also supports auto-negotiation of flow control, so the switch can
automatically prevent port buffers from becoming saturated.
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