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Closed user group (CUG) is a call restriction service among the optional services of

X.25. It is mainly used to restrict originating or receiving call capabilities for data

transmission equipment (DTE) users. The users in the same CUG can still call each

other, but users of different CUGs cannot. As a result, this allows you to form a

private data communication subnet on an X.25 public data communication network.

The X.25 CUG service can be configured using these CLI commands:

x25 map protocol protocol-address x121-address x.121-address

closed-user-group group_number

x25 call-facility closed-user-group group-number undo x25 call-facility closed-

user-group

x25 cug-service [ incoming-access ] [ outgoing-access ] [ suppress { all |

preferential } ]

undo x25 cug-service

x25 local-cug cug-number network-cug cug-number [ no-incoming ] [ no-

outgoing ] [ preferential ]

undo x25 local-cug cug-number

display x25 cug

3. BRI 128K Leased Line

BRI stands for Basic Rate Interface, which is the basic ISDN configuration. This

configuration consists of two B-channels that can carry voice or date at a rate of

64Kbps, and one D-channel, which carries call-control information. The current

release supports a 128Kbps leased line by combining the two 64Kbps B-channels into

a single 128Kbps physical channel.

You can use these CLI commands to configure the ISDN 128K leased line:

dialer isdn-leased channel-number

undo dialer isdn-leased channel-number

dialer isdn-leased 128k

undo dialer isdn-leased 128k

isdn link-mode p2p

undo isdn link-mode p2p

4. HWPing

HWPing is a tool used for testing the performance of the protocols operating on a

network. It is an enhancement to the ping function that only allows you to test the

roundtrip delay (time required for a packet to travel from the local end to a specified

destination and return to the local end again). HWPing enhances the ping function by

detecting the state (enabled or disabled) of a DLSW, DHCP, FTP, HTTP, or SNMP

Server, and testing the response time for each type of service.

http://www.3com.com/

Part No.

10014533

Published August 2004