3-23
Cisco 1240 Connected Grid Router Hardware Installation Guide
OL-26223-04
Chapter 3 Router Hardware Description
Hardware Features Detailed Description
Gigabit Ethernet Ports
The router features two Gigabit Ethernet (GE) ports that can be used to enable WAN connectivity to a
primary substation or a control center. The ports are shown in
Figure 3-15
.
Table 3-11
describes how the
GE ports are labelled on the router and referred to in software.
Note
Interfaces ETH 2/1 and ETH 2/2 are also used by the small form-factor pluggable (SFP) ports (see the
“Small Form-Factor Pluggable (SFP) Ports” section on page 3-24
. For more information about how these
ports are used together, see the
“Combo Ports” section on page 3-25
.
The GE ports automatically detect the type of any connected cable (fiber or copper) and then switch to
the corresponding mode (fiber or copper). When both cables types are connected to the router, the first
cable that establishes a link is enabled.
Fast Ethernet and Gigabit Ethernet Port Specifications
Table 3-11
CGR 1240 Gigabit Ethernet Port Naming
CGR 1240 Router Label
Cisco CG-OS Software Port Name
Cisco IOS Software Port Name
ETH 2/1
GE 2/1
GE 2/1
ETH 2/2
GE 2/2
GE 2/2
Table 3-12
Fast Ethernet and Gigabit Ethernet Port Specification Overview
Specification
Description
Ethernet Standard
IEEE 802.3.
Connector type
RJ-45
Interface speed
10BASE-T, 100BASE-TX, 1000-BASE-TX
Pinouts
See the
“Connector and Cable Specifications”
appendix.
Table 3-13
Fast Ethernet and Gigabit Ethernet Port Specification Detail
Speed
Descriptions
Cable Type
Distance
1000BASETX
1000 Mbps full-duplex
transmission
Category 5 or better
328 feet (100 meters)
100BASE-TX
100 Mbps full-duplex
transmission
Category 5 or better shielded
twisted-pair (STP) cable
328 feet (100 meters)
10BASE-T
10 Mbps full-duplex
transmission
Category 5 or better shielded
twisted-pair (STP) cable
328 feet (100 meters)