Filter
Top Products
DS0 mapping and in-band management 60
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 5 • DS0 Mapping
• Static Connection section where you can view the previously defined DS0 mappings (cross-connections) in
the T-DAC (see section “Defined Mappings Table (Static Connections)” on page 72)
DS0 mapping and in-band management
When in-band management (see chapter 11, “In-band management” on page 149) is configured, some of the
DS0’s bandwidth is no longer available for standard DS0 mapping. If a Model 6511RC Matrix Switch is not
in the ForeFront chassis, in-band management provides access to the management service in all cards installed
in the ForeFront chassis.
Non-blocking system constraints with in-band management
Each 3096RC & 3196RC T-DAC module provides a pool of 4096 simplex DS0s for DS0 mapping to other
ForeFront modules. These DS0s are for interconnecting ports between modules via the ForeFront’s midplane.
Each module-to-module mapping requires a minimum of two simplex DS0s, one for transmitting and one for
receiving. The 3096RC and 3196RC T-DAC’s support totally non-blocking, any-to-any mapping using all
4096 DS0 simplex channels.
Configuring Chassis Management Channels for in-band management is a special case. The T-DAC automati-
cally allocates half of its DS0 pool (2048 DS0s) to in-band management. This allocation reduces the T-DAC’s
pool of DS0s for DS0 inter-module mapping from 4096 to 2048 simplex DS0s. However, with proper system
design, the allocation of 2048 DS0s is rarely limiting.
If one or more Chassis Management Channels have been configured, the T-DAC’s DS0 mapping subsystem of
4096 simplex DS0s is split into two pools (each with 2048 DS0s): one pool for the Chassis Management
Channel and the other for mapping to other ForeFront modules (see the note below for how many DS0s are
used in a Chassis Management Channel). You may select from any of the unused DS0 ports and time slots.
(“Unused” means a DS0 port and time slot that have not specifically been assigned a DS0 mapping to another
card or a CMC.
Upon deleting the last Chassis Management Channel, the T-DAC de-allocates the 2048 DS0s reserved for in-
band management, returning them to the pool so all 4096 DS0s are again available for mappings to other
modules.
Note
The T-DAC supports a maximum of 10 full-duplex Chassis Manage-
ment Channels. Each Chassis Management Channel utilizes 2 DS0s,
one for transmitting and one for receiving. As a result, 10 Chassis Man-
agement Channels utilize only 20 DS0s from the 2048 DS0s allocated
to the function.
System design considerations and guidelines
In order to maximize the T-DAC’s throughput while using the Chassis Management Channel feature, remem-
ber the following points when defining standard (non-management) DS0 mappings. When Chassis Manage-
ment Channels are implemented, the following T-DAC mappings utilize DS0s from the pool of 2048 DS0s
available for mappings to other modules:
• Between any T-DAC G.SHDSL port (Model 3096RC) or iDSL port (Model 3196RC) and any DS0 used
to map to another module
• Between any T-DAC T1/E1 port any used to map to another module.