User's Manual

DEC. 2011—EFT REVIEW DRAFT—CISCO CONFIDENTIAL

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Cisco 1240 Connected Grid Router Hardware Installation Guide

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Chapter 2 Router Hardware Description

Hardware Features Detailed Description

Combo Ports

The two Gigabit Ethernet Ports and the two Small Form-Factor Pluggable (SFP) Ports ports are labeled

identically (ETH 2/1 and ETH 2/2) because the SFP and GE interfaces share physical ports on the router.

The Gigabit Ethernet ports support copper GE connections and the SFP modules support fiber optic GE

connections. Only one instance of each interface (ETH

2/1 and ETH 2/2) can be in use at any time.

These ports automatically detect the type of any connected cable (fiber or copper) and then switch to the

corresponding mode (fiber or copper)

Note If connections are made to both interfaces of the same name (ETH 2/1 or ETH 2/2), only the first

connection that establishes a link is enabled.

Figure 2-19 GE Ports and SFP Ports Share Interfaces ETH 2/1 and ETH 2/2

IRIG-B Timing Port

Note Currently not supported. This hardware feature will be supported in a future software release.

Items Description Gigabit Ethernet Connection Type

1 Gigabit Ethernet ports Copper

2 SFP module ports Fiber optic