User guide

3-14

Configuration Guide for Cisco DSLAMs with NI-2

OL-2074-03

Chapter 3 Initially Configuring the Cisco DSLAM

Testing the Ethernet Connection

After you configure the IP addresses for the Ethernet interface, test for connectivity between the

DSLAM and a host. The host can reside anywhere in your network. To test for Ethernet connectivity,

use this command in EXEC mode:

For example, to test Ethernet connectivity from the DSLAM to a workstation with an IP address of

172.20.40.201, enter the command ping ip 172.20.40.201. If the DSLAM receives a response, this

message appears:

DSLAM# ping ip 172.20.40.201

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.20.40.201, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 ms

Configuring Network Clocking

This section describes how to configure network clocking for the DSLAM. Each port has a transmit

clock and derives its receive clock from the receive data. You can configure transmit clocking for each

port in one of these ways:

• Network derived—Transmit clocking is derived from the highest priority configured source, either

from the internal clock (the default) or the public network.

• Loop-timed—Transmit clocking is derived from the receive clock source.

The DSLAM receives derived clocking, along with data, from a specified interface. For example, in

Figure 3-3, the DSLAM extracts transmit clocking from the data received at ATM 0/1 and distributes it

as the transmit clock to the rest of the DSLAM. ATM 0/2 then uses network-derived transmit clocking

received from ATM 0/1.

Command Task

DSLAM# ping ip ip_address Test the configuration using the ping command. The

ping command sends an echo request to the host

specified in the command line.