Specifications

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Cisco 7100 Series VPN Router Installation and Configuration Guide
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Chapter 1 Overview
Cisco 7120 Series 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 Figure 1-8
and described in Table 1-2.
Figure 1-8 Cisco 7120-T3 WAN Port LEDs
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:
• 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
Table 1-2 Cisco 720-T3 LED Descriptions
LED Label Color State Function
EN Green On Indicates the port is ready.
RCLK Green On Indicates a receive clock has been detected.
FERF Yellow On Indicates the framer detected far-end receive failure.
RL Yellow On Indicates the port is in remote loopback mode.
AIS Yellow On Indicates the framer detected an alarm indication signal.
OOF Yellow On Indicates the framer detected out of frame.
LL Yellow On Indicates the port is in local loopback mode.
18489
XMTRRCVR
EN
RCLK FERF RL
AIS OOF LL
5
I
RCLK FERF RL
AIS OOF LL
LEDs
EN