Filter
Top Products
3-23
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Chapter 3 Installing the Router
Connecting to the Console and Auxiliary Ports
Note The RJ-45 and MII receptacles on the GRP represent two physical connection
options for one Ethernet interface; you can use either the MDI RJ-45 connection
or the MII connection, but not both simultaneously. The transmission speed of the
Ethernet port is set through an auto-sensing scheme on the GRP.
The speed is determined by the network to which the Ethernet interface is
connected, and is not user-configurable. Moreover, even at the auto-sensed data
transmission rate of 100
Mbps, the Ethernet port provides maximum usable
bandwidth of less than 100
Mbps. Expect a maximum usable bandwidth of
approximately 20 Mbps when using either the MII or RJ-45 connection.
The Ethernet port can use either unshielded twisted-pair or screened twisted-pair
cable. In sites where extremely high immunity to noise is required, screened
twisted-pair cable is recommended.
Figure 3-12 shows the layout of the Ethernet
MII receptacle on the GRP.
Figure 3-12 Ethernet MII Receptacle
Table 3-5 lists the signal-to-pin correspondence for the Ethernet MII connector.
Jackscrew Pin 21
Pin 1
H6538
Ta b l e 3-5 Ethernet MII Pin Configuration
Pin
1
In Out Input/Output Description Code
14 to17 – Yes – Transmit Data TxD
12 Yes – – Transmit Clock Tx_CLK
2
11 – Yes – Transmit Error Tx_ER
13 – Yes – Transmit Enable Tx_EN
3 – Ye s – MII Data Clock MDC
4 to 7 Yes – – Receive Data RxD