Data Ports - Cisco uBR924 Installation Manual

Features
Table 1-1 Cisco uBR924 Cable Access Router Front Panel LED Description (continued)
Label Description
V2 Voice Port 2
LINK Cable RF Link
1
DS Downstream Signal
Lock Status
1
US Upstream Signal
Quality
1
DSNR Downstream
Signal-to-Noise
Ratio
1. These are the Cisco factory-default LED settings. Configuration control messages can be sent to the Cisco uBR924 cable access router through Simple
Network Management (SNMP) set requests. Using Management Information Base (MIB) objects in the Cisco cable device MIB, the CMTS system
administrator can define these LEDs to have other meanings.

Data Ports

As shown in Figure 1-6, the Cisco uBR924 cable access router contains a coaxial cable F-connector and
four Ethernet 10Base T connectors. The cable F-connector must always be connected to the cable
system for proper operation. The Ethernet connectors can be connected in one of the following
configurations:
•
•
•
•
Cisco uBR924 Router Hardware Installation Guide
1-14
Color Function
Green On = Call in progress
Off = No call
Green On = Cable connection up; RF link up
Blink = Cisco uBR924 is searching for a downstream frequency
Off = Cable connection down; RF link down
Green On = Cisco uBR924 is locked to a downstream frequency (channel).
Off = Cisco uBR924 has not yet locked to a downstream frequency (channel) or
the router has not yet located a digital signal.
Green On = Cisco uBR924 has established upstream communications with the CMTS;
cable access router has completed ranging state 2 (as per DOCSIS), has entered
provisioning state, and is communicating within 6 dB of desired final power level
(generally within 3 dB).
Off = Cisco uBR924 has not completed secondary ranging; the CMTS has heard
from the cable access router, however, and there is some upstream continuity.
Green On = Receiving quality, downstream signal; SNR is greater than 5 dB above the
downstream lock threshold.
Off = Receiving low or marginal downstream signal strength or quality.
The signal is checked approximately every 25 seconds and the DSNR
Note
LED is updated to reflect the current state. If this LED remains off, it
could indicate a problem with the cable at the subscriber's site.
If the router is configured for bridging mode, from one to four CPE devices can be connected
directly to the router when using Cisco IOS 12.0(5)T or higher images. (Only three devices can be
connected if using Cisco IOS 12.0(4)XI or prior images.)
If the router is configured for bridging mode, an Ethernet hub can be connected to one of the
router's Ethernet ports. The hub can then in turn be connected to up to additional CPE devices (up
to three devices are supported in Cisco IOS 12.0(4)XI or prior images, and up to 254 devices are
supported in Cisco IOS 12.0(5)T or higher images).
If the router is configured for routing mode, up to four CPE devices can be directly connected to
the router's Ethernet ports.
If the router is configured for routing mode, an Ethernet hub can be connected to one of the router's
Ethernet ports. The hub can then in turn be connected to any number of devices.
Chapter 1 Product Overview
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