Cisco Systems Cisco 12008 manual RJ-45 and MII Ethernet Connections

Connecting Route Processor Cables

Note At the auto-sensed data transmission rate of 100 Mbps, the Ethernet port provides maximum usable bandwidth that is less than 100 Mbps; a maximum usable bandwidth of approximately 20 Mbps should be expected from either the RJ-45 or MII connections.

Transmission speed is determined by the network to which the Ethernet interface is connected and is not user-configurable.

Figure 3-8 RJ-45 and MII Ethernet Connections

To repeater

or DTE

RJ-45 cable

To transceiver, repeater, or DTE

MII cable

L

IN

K

T

XC O

L L

R

X

M

II

R J - 4 5

GIGABIT ROUTE

PROCESSOR

H10736

Both the MII and RJ-45 receptacles support IEEE 802.3u Ethernet interfaces compliant with the 100Base-TX and 10Base-T standards. The MII receptacle requires an external transceiver that permits connection to multimode fiber for 100Base-FX or 100Base-T4 physical media. Only one Ethernet receptacle, either RJ-45 or MII, can be used at a time. Two LEDs on the GRP faceplate show which Ethernet receptacle is active.

Note The Ethernet port can use either unshielded twisted-pair or screened twisted-pair cables. In sites where extremely high immunity to noise is required, screened twisted-pair cable is recommended.

3-24Cisco 12008 Gigabit Switch Router Installation and Configuration Guide