Cisco 1721 - Manual (Page 29)

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Cisco 1721 Router Hardware Installation Guide
78-13834-02
Chapter 1 Cisco 1721 Router Overview
Router Memory
Router Memory
This section describes the types of memory stored in the router and how to find
out how much of each type of memory is stored in the router.
For instruction on how to upgrade memory in the router, see Appendix C,
“Installing and Upgrading Memory and Virtual Private Network Modules.”
WIC1
ACT/CH0 Green Serial and DSU/CSU cards—Blinks when data is being sent to or
received from the port on the card in the WIC1 slot.
ISDN cards—On solid when the first ISDN B channel is up for the card
in the WIC1 slot.
2-port serial cards—Blinks when data is being sent to or received from
the first port on the 2-port card in the WIC1 slot.
ACT/CH1 Green Serial and DSU/CSU cards—Remains off.
ISDN cards—On solid when the second ISDN B channel is up for the
card in the WIC1 slot.
2-port serial cards—Blinks when data is being sent to or received from
the second port on the 2-port card in the WIC1 slot.
ETH
ACT Green Blinks when there is network activity on the Ethernet port.
COL Yellow Blinks when there are packet collisions on the local Ethernet network.
Table 1-4 Front Panel LEDs (continued)
LED Label Color Description