Cisco Systems UBR924 manual Connect to the Cisco uBR924, Cmts

Step 2—Connect to the Cisco uBR924

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Table 1	Cable Modem Initialization Sequences and Events
Sequence	Event	Description
1	Scan for a downstream channel and	The Cisco uBR924 acquires a downstream channel from the
	establish synchronization with the	CMTS and saves the last operational frequency in non-volatile
	CMTS.	memory. The Cisco uBR924 tries to reacquire the saved
		downstream channel the next time a request is made.

Note An ideal downstream signal is one that synchronizes QAM symbol timing, FEC framing, MPEG packetization, and recognizes downstream sync MAC layer messages.

2Obtain upsteam channel parameters. The Cisco uBR924 waits for an upstream channel descriptor (UCD) message from the CMTS. The UCD provides transmission parameters for the upstream channel.

3Start ranging for power adjustments. The ranging process adjusts the Cisco uBR924’s transmit power. Ranging is performed in two stages: ranging state 1 and ranging state 2.

4	Establish IP connectivity.	The Cisco uBR924 sends a DHCP request to obtain an IP
		address, which is needed for IP connectivity. The DHCP
		response also includes the name of a file that contains
		additional configuration parameters, the TFTP server’s
		address, and the Time of Day (TOD) server’s address.
5	Establish the time of day.	The Cisco uBR924 accesses the TOD server for the current
		date and time, which is used to create time stamps for logged
		events (such as those displayed in the MAC log file).
6	Establish security.	Keys for privacy are exchanged between the Cisco uBR924
		and the CMTS.
		Note The Cisco uBR924 cable access router supports baseline
		privacy in Cisco IOS Release 12.0(5)T and later.
7	Transfer operational parameters.	After the DHCP and security operations are successful, the
		Cisco uBR924 downloads operational parameters from a
		configuration file stored on the cable company’s TFTP server.
8	Perform registration.	The Cisco uBR924 registers with the CMTS. After it is
		initialized, authenticated, and configured, the Cisco uBR924 is
		authorized to forward traffic onto the cable network. .
9	Comply with baseline privacy.	If the software image running on the Cisco uBR924 includes
		baseline privacy, link level encryption keys are exchanged
		between the CMTS and the Cisco uBR924.
10	Enter the operational maintenance	As soon as the Cisco uBR924 has successfully completed the
	state.	above sequence, it enters operational maintenance state.

Step 2—Connect to the Cisco uBR924

Telnet to the IP address assigned to the cable interface or Ethernet interface. If the interface is not up, you will need to access the Cisco IOS software via the RJ-45 console port, which is a physical port on the back of the Cisco uBR924.

Note For security purposes, the console port on the Cisco uBR924 may have been deactivated by the cable service company prior to installation at the subscriber site.

10Cisco IOS Release 12.0(5)T