Cisco 7120 Series User Manual page 7

Chapter 1 Overview
The Cisco 7120-4T1 WAN ports have one enabled (EN) LED and five status LEDs (each of the four ports
has a set of status LEDs). After system initialization, the enabled LED goes on to indicate that all ports
have been enabled for operation. If the initialization fails for any reason, the enabled LED will not go
on. The LEDs are shown in
Figure 1-6
EN
5
EN
I
Table 1-1
LED Label
EN
TD
TC
RD
RC
LB/CD
1. DTR = Data Terminal Ready.
2. DSR = Data Set Ready.
3. RTS = Request To Send.
4. CTS = Clear To Send.
5. DCD = Data Carrier Detect.
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Figure 1-6
Cisco 7120-4T1 WAN Port LEDs
LEDs
Cisco 7120-4T1 LEd Descriptions
Color State Function
Green On Indicates ports are ready.
Green On DTE—Transmit data out.
DCE—Transmit data in.
Green On DTE—Transmit clock in.
DCE—Transmit clock in (TxCE).
Green On DTE—Receive data in.
DCE—Receive data out.
Green On DTE—Receive clock in.
DCE—Receive clock out.
Green On Indicates DTR
Green Flashing Indicates RTS, CTS, or DCD is sending and receiving data in
half-duplex mode.
Yellow On Indicates local loop or internal loop active.
Cisco 7100 Series VPN Router Installation and Configuration Guide
and described in Table 1-1.
1 2 3
, DSR , RTS
Cisco 7120 Series Overview
4 5
, CTS , or DCD is active.
1-7