Installing the Router 3-129
Connecting Interface Cables
Fast Ethernet Connections
For an MII connection, a 100BaseT transceiver or MAU should already be connected to your
network. The RJ-45 connection does not require an external transceiver.
On a single 100BaseT port adapter, you can use either the RJ-45 connection or the MII connection.
If you have two 100BaseT port adapters on your FEIP, you can use the RJ-45 connection on one and
the MII connection on the other.
Note Do not simultaneously connect MII and RJ-45 cables to one 100BaseT port adapter. RJ-45
and MII cables are not available from Cisco Systems.
If you have RJ-45 connections, attach the Category 5 UTP cable directly to the RJ-45 port on the
FEIP. (See Figure 3-7.)
If you have MII connections, attach an MII cable directly to the MII port on the FEIP or attach a
100BaseT or 100BaseF transceiver, with the media appropriate to your application, to the MII port
on the FEIP. (See Figure 3-7.)
Attach the network end of your RJ-45 or MII cable to your 100BaseT or 100BaseF transceiver,
switch, hub, repeater, DTE, or whatever external, 100BaseT equipment you have.
Figure 3-7 Fast Ethernet Connections
Caution
To prevent problems on your FEIP and network, do not simultaneously connect RJ-45 and
MII cables to one 100BaseT port adapter. On a single 100BaseT port adapter, only one network
connection can be used at one time. Only connect cables that comply with EIA/TIA-588 standards.
MII cable
To transceiver,
repeater, or DTE
MII
ENABLED
RJ-45 cable
To repeater
or DTE
RJ45
H3073
Bottom port adapter
Top port adapter
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