Verifying Local And Remote E3 Port Settings; Selecting A Dsu Mode; Configuring The Dsu Bandwidth Range; Enabling Payload Scrambling - Cisco 7304 Installation And Configuration Manual

Configuring the Interfaces

Verifying Local and Remote E3 Port Settings

You can use telnet to determine the DSU mode settings on the remote E3 port. Once you verify the
remote E3 port settings, you can negotiate changing configuration parameters so that DSU mode settings
are the same on both the local and remote E3 ports.

Selecting a DSU Mode

The DSU mode supports two third-party DSU vendors—Digital Link and Kentrox—and the default DSU
mode, Cisco. If you use a DSU to make the connection between the Cisco 7304 router and another
device, the local E3 port configuration must match the remote E3 port configuration. Therefore, if the
remote E3 port uses the Kentrox vendor, a request is sent to the local E3 port to change the DSU mode
to Kentrox, either by manually entering the dsu mode configuration command and specifying the
Kentrox DSU or by using the Cisco Remote Connection Management (CRCM) feature to remotely
configure the remote E3 port. If you make a direct connection between a Cisco 7304 router and another
device, you can use the Cisco DSU mode.

Configuring the DSU Bandwidth Range

The DSU bandwidth range is from 0 to 34010 kbps. The local port and the remote port must have
matching configurations. Therefore, if you reduce the effective bandwidth to 3000 on the local port, you
must do the same on the remote port by entering the dsu bandwidth interface configuration command.
In interface configuration mode, reduce effective bandwidth (range of 0 to 34010 kbps) by entering the
dsu bandwidth configuration subcommand, as in the following example:
Router(config-if)# dsu bandwidth 3000
Use the
Note The local port configuration must match the remote port configuration.

Enabling Payload Scrambling

Payload (data) scrambling converts the data received by the local or remote E3 ports from the Digital
Link and Kentrox third-party DSU vendor modes as well as the default, Cisco mode. To enable payload
scrambling on the local and remote E3 ports, you must enter the scramble interface configuration
command. If you do not enter the scramble command, payload scrambling remains disabled by default
on the local and remote E3 ports.

Configuring Cyclic Redundancy Checks

Table 4-6
remainder of this section.
Cisco 7304 6-Port Clear Channel E3 Line Card Installation and Configuration
4-6
form of this command to return to the default, 34010.
no
summarizes cyclic redundancy check (CRC) commands. For more information, see the
Chapter 4 Configuring the 6E3 Line Card
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