Cisco 7120 Series User Manual page 9

Chapter 1 Overview
The Cisco 7120-T3 WAN port has one enabled LED and six uplink port status LEDs. After system
initialization, the enabled LED goes on to indicate that the port has been enabled for operation. If the
initialization fails for any reason, the enabled LED will not go on. The LEDs are shown in
and described in
Figure 1-8
5
I
Table 1-2
LED Label
EN
RCLK
FERF
RL
AIS
OOF
LL
Cisco 7120-E3
The Cisco 7120-E3 provides one high-speed, synchronous serial port that supports full-duplex operation
at E3 (34-Mbps) speeds. The Cisco 7120-E3 provides the following features:
•
•
•
•
•
•
•
•
•
78-6341-03
Table 1-2.
Cisco 7120-T3 WAN Port LEDs
LEDs
EN
RCLK FERF RL
AIS OOF LL
RCVR XMTR
RCLK FERF RL
EN
AIS OOF LL
Cisco 720-T3 LED Descriptions
Color State
Green On
Green On
Yellow On
Yellow On
Yellow On
Yellow On
Yellow On
Integrated data service unit (DSU) functionality
16- and 32-bit cyclic redundancy checks (CRCs)
HDB3 line coding
Scrambling and bandwidth reduction
G.751 framing or bypass framing
National service bits
Loopbacks
ATM-DXI, Frame Relay, HDLC, SMDS, and PPP serial encapsulation
RFC 1213 and RFC 1407
Function
Indicates the port is ready.
Indicates a receive clock has been detected.
Indicates the framer detected far-end receive failure.
Indicates the port is in remote loopback mode.
Indicates the framer detected an alarm indication signal.
Indicates the framer detected out of frame.
Indicates the port is in local loopback mode.
Cisco 7100 Series VPN Router Installation and Configuration Guide
Cisco 7120 Series Overview
Figure 1-8
1-9