Cisco 3750 - Manual (Page 13)

1-3
Catalyst 3750 Metro Switch Hardware Installation Guide
OL-9160-02
Chapter 1 Product Overview
Front Panel Description
Console Port
You can connect the switch to a PC through the console port by using the supplied RJ-45-to-DB-9 female
cable. If you want to connect the switch console port to a terminal, you need to provide an
RJ-45-to-DB-25 female DTE adapter. You can order a kit (part number ACS-DSBUASYN=) containing
that adapter from Cisco. For console port and adapter pinout information, see
Appendix B, “Connector
and Cable Specifications.”
10/100 and 10/100/1000 Ports
You can set the 10/100 ports on the switch to operate in any combination of half duplex, full duplex,
10 Mb/s or 100 Mb/s. You can set the standard 1000BASE-T SFP module ports to operate in 10, 100, or
1000 Mb/s in full duplex. The 1000BASE-T SFP module operates only at 1000 Mb/s in the
enhanced-services ports. You can also set these ports for speed and duplex autonegotiation in compliance
with IEEE 802.3ab. (The default setting is autonegotiate.)
When you set the port for autonegotiation, it identifies the speed and duplex settings of the attached
device and advertises its own capabilities. If the connected device also supports autonegotiation, the
switch port negotiates the best connection (that is, the fastest line speed that both devices support and
full-duplex transmission if the attached device supports it) and configures itself accordingly. In all cases,
the attached device must be within 100 meters (328 feet).
100BASE-TX and 1000BASE-T traffic requires a Category 5 or higher cable. 10BASE-T traffic can use
Category 3 or Category 4 cables. When you connect the switch to workstations, servers, routers, and
Cisco IP Phones, be sure that the cable is a straight-through cable. When you connect the switch to
switches or hubs, use a crossover cable. When you use a straight-through or crossover cable for
1000BASE-T connections, be sure to use a twisted four-pair, Category 5 or higher cable for proper
operation. Pinouts for the cables are described in
Appendix B, “Connector and Cable Specifications.”
You can use the mdix auto interface configuration command to enable the automatic crossover feature.
When the automatic crossover feature is enabled, the switch detects the required cable type and
configures the interfaces accordingly. Therefore, you can use either a crossover or a straight-through
cable for all connections to an Ethernet port on the switch.
The automatic crossover feature is disabled by default. For configuration information for this feature,
refer to the switch software configuration guide or the switch command reference.
SFP Module Slots
The switch uses Gigabit Ethernet SFP modules to establish fiber-optic connections. These transceiver
modules are field-replaceable, providing the uplink interfaces when inserted in an SFP module slot.
You can use the SFP modules for Gigabit uplink connections to other switches. You use fiber-optic
cables with or MT-RJ LC or MT-RJ connectors to connect to a fiber-optic SFP module. You use Category
5 or higher cable with RJ-45 connectors to connect to a copper SFP module.
When you install 1000BASE-T SFP modules in the standard ports, they can operate at 10, 100, or 1000
Mb/s in full-duplex mode. When you install 1000BASE-T SFP modules in the enhanced-services ports,
they operate only at 1000 Mb/s. The switch supports 100BASE-FX SFP modules only in standard ports.
See the
“Features” section on page 1-1 for a list of SFP modules that the switch supports.
Refer to the Release Notes for the Catalyst 3750 Metro Switch for the most current list of Cisco
SFP module options that the switch supports. For more information about these SFP modules, refer to
your SFP module documentation.