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Clear Channel 6-Port T3 (DS3) Line Card Installation and Configuration
OL-3449-02
Chapter 4 Configuring the 6T3 Line Card
Configuring the Interfaces
Customizing the 6T3 Line Card Configuration
There are two sides to the network, a local network side and a remote customer side, or near and far ends.
The 6T3 line card supports third-party data service units (DSUs), Internet Service Provider
(ISP)-provided DS3 lines, and so on. You can change the configuration parameter default values in the
6T3 line card port interfaces to match the remote DSUs on your network. Table 4-5 shows the
configuration parameters.
Note The local port and the remote port must have matching configuration.
Verifying Local and Remote DS3 Port Settings
You can use telnet to determine the DSU mode settings on the remote DS3 port. Once you verify the
remote DS3 port settings, you can negotiate changing configuration parameters so that DSU mode
settings are the same on both the local and remote DS3 ports. You can set the DSU bandwidth to accept
or reject the incoming remote requests from the local DS3 port by entering the dsu remote accept
interface configuration command.
Selecting a DSU Mode
The DSU mode supports several third-party DSU vendors—Adtran, Digital Link, Kentrox, and
Larscom—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 DS3 port configuration must match the remote DS3 port
configuration. Therefore, if the remote DS3 port uses the Kentrox vendor, a request is sent to the local
DS3 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 DS3 port. If you make a direct connection between a
Cisco 7304 router and another device, you can use the Cisco DSU mode.
Table 4-5 6T3 Line Card Serial Interface DSU Modes
Parameter Configuration Command
Default
Value Command
DSU mode [no] dsu mode [adtran | cisco |
digital-link | kentrox| larscom]
cisco
Router(config-if)# dsu mode cisco
DSU subrate bandwidth [no] dsu bandwidth kbps 44210 Router(config-if)# dsu bandwidth
44210
Far-end DSU bandwidth [no] dsu remote fullrate subrate Router(config-if)# dsu remote
fullrate
Payload scrambling [no] scramble
1
1. Adtran DSU mode does not support payload scrambling.
no
scramble
Router(config-if)# scramble
Remote requests [no] dsu remote accept accept Router(config-if)# dsu remote
accept
Cyclic redundancy check crc [16 | 32] 16 Router(config-if)# crc 16