Cisco Systems 12406, 12006 manual Pin1 Out Input/Output Description Code, Mdc

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 3-12shows the layout of the Ethernet MII receptacle on the GRP.

Figure 3-12 Ethernet MII Receptacle

Pin 1

H6538

Jackscrew Pin 21

Table 3-5lists the signal-to-pin correspondence for the Ethernet MII connector.

		Table 3-5		Ethernet MII Pin Configuration
		Pin1		In	Out	Input/Output	Description	Code
		14 to17		–	Yes	–	Transmit Data	TxD
		12		Yes	–	–	Transmit Clock	Tx_CLK2
11				–	Yes	–	Transmit Error	Tx_ER
13				–	Yes	–	Transmit Enable	Tx_EN
3				–	Yes	–	MII Data Clock	MDC
		4 to 7		Yes	–	–	Receive Data	RxD
			Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
	OL-11497-03								3-23