Cabletron Systems 9A426-01 appendix Modifying Fields and User Privileges

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9A426-01/9A426-02 Module Specific Information

Modifying Fields and User Privileges

To modify fields on these modules, you must have read-write or super-user privileges. If you have read-only privileges, you can view information; however, you cannot modify any fields.

Virtual Channels and Virtual Paths

Rather than addressing cells to a specific destination, as in a LAN, ATM addresses cells to Virtual Channels (VCs) and/or Virtual Paths (VPs). This addressing takes place in the header field of the ATM cell.

VCs and VPs are bi-directional (i.e., they transfer information in both directions on a single channel or path) and are “set up” between devices on the ATM network prior to transmission. Similar to WAN transmission, ATM technology provides the ability of sending several VCs together over a VP, and several VPs over an ATM link segment.

Permanent and Switched Virtual Channels

ATM networks use two different types of Virtual Channels:

•Permanent Virtual Channels (PVCs)

•Switched Virtual Channels (SVCs).

The difference between PVCs and SVCs exists in the channel setup.

PVCs are pre-configured by an administration function, and are usually established for long-term use. After setting up this channel, nothing else is required by the network to transfer information between the two established points. This type of virtual channelling is established through a local or remote management interface.

SVCs use a signaling and network switching procedure to set up dynamically. In other words, SVCs are established “on the fly,” as needed for a particular service, used to transmit on the short term, and then terminated.

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Contents SmartSwitch 9000 9A426-01/9A426-02 Local Management Appendix Page Local Management Screens IntroductionInterface Number Name Description Module InterfacesVirtual Channels and Virtual Paths Permanent and Switched Virtual ChannelsModifying Fields and User Privileges A426-01/9A426-02 FNB Resource Configuration Screen FNB Resource Configuration ScreenChanging the Current FNB Connection FNB Resource Configuration Screen FieldsA426-01/9A426-02 Connection Table Screen Connection Table ScreenConnection Table Screen Fields Displaying the Add/Delete Entry Screen 9A426-02 ADD/DELETE Entry Add/Delete Entry ScreenAdd/Delete Entry Screen Fields Deleting PVCs From the Connection Table Adding PVCs to the Connection TableA426-01/9A426-02 LEC Administration Screen LEC Administration ScreenLEC Administration Screen Fields Adding an Elan Modifying an Elan Deleting an Elan9A426-02 LEC Properties LEC Properties ScreenLEC Properties Screen Fields A426-01/9A426-02 SVC Signalling Screen SVC Signalling ScreenSVC Signalling Screen Fields A426-01/9A426-02 Diagnostics Screen Diagnostics ScreenEnabling and Disabling Extended Diagnostics Diagnostics Screen Field9A426-01/9A426-02 Module Specific Information
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