Advanced Diagnostic Network; Changing Protocol Modes - Paradyne COMSPHERE 6800 Series Communications Products Support Configuration Manual

Advanced Diagnostic Network

The Advanced diagnostic network uses a true tree topology. (A tree is composed of point-to-point
and multipoint circuits.) Note that the circuits are not designated as outboard, backbone and
extended as in DATAPHONE II networks. In Advanced diagnostic networks, a circuit's position is
specified by its level in the tree.
Follow these guidelines when working with Advanced diagnostic networks:
• Up to five circuit links can be cascaded in any combination of point-to-point or multipoint
• Up to 256 local devices on each control channel can be supported by the NMS.
• Up to 32 tributary modems (multipoint drops) can be polled by a control modem on its
• Up to 256 downstream devices can be polled by a tributary modem on its diagnostic
• Multipoint circuits can be installed behind multipoint circuits. (Note that in a DATAPHONE
Each COMSPHERE device on the same diagnostic, secondary, and control channel must have a
unique network address. If a control modem is connected to the NMS control channel, the network
address of the modem must be added to the NMS poll list. If the control modem is located further
downstream, its network address must be added to the upstream tributary modem's poll list. Each
device must have a device profile in ADp mode.

Changing Protocol Modes

As your type of diagnostic network changes, you must change the diagnostic protocol mode in
which your devices operate. When you created device profiles, you indicated a device's link-level
address and protocol mode. Unless this information has been changed locally at a device, the
profiles have remained synchronized with the devices.
There are two ways in which the protocol mode can be changed: from the NMS or from the
device's front panel. The method of synchronization is different for these two choices.
6800-A2-GB20-20
circuits.
secondary channel.
channel.
II network, extended tail circuits are the lowest level in the diagnostic tree.)
The ADp mode in which the Advanced diagnostic network operates
requires the long-form addressing scheme. Therefore, the address
of each intermediate tributary modem must be included in the
address. For more information on addressing, refer to Appendix D of
the COMSPHERE 6800 Series Network Management System
User's/System Administrator's Guide.
January 1997
NOTE
Managing Modems and DSUs
1-9