cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 184

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

6.0 Traffic Management
6.3 ABR Flow Control Manager
6.3.6 Cell Type Decisions
Figure 6-15. Steady State ABR-ER Cell Stream
6-28
6.3.6.1 In-rate Cell
Note: Nominally, Nrm = 32
Streams
FW_RM BW_RM
Since every ABR connection in a network is full duplex, the CN8237 is a Source
and a Destination for each VCC. The CN8237 multiplexes user data cells,
Forward RM cells, and Backward RM cells into the in-rate ABR cell stream.
TM 4.1 Source Behaviors specify rules for the in-rate cell stream.
transmits one Forward RM cell. A Backward RM cell follows. Finally, the Source
sends Nrm user data cells. At steady state, this sequence would be repeated with a
Forward RM cell marking the beginning of each sequence.
characteristics of ABR connections, all connections do not maintain a steady state
sequence. Furthermore, since it is an immature specification, the rules for cell
interleaving of in-rate cell streams may be modified slightly.
One FORWARD_RM Cell Period
Figure 6-15
Unfortunately, due to the asynchronous, asymmetrical, and fluctuating
Mindspeed Technologies
Nrm Data Cells
shows the desired result of the specification. First, the Source
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
™
FW_RM
BW_RM
28237-DSH-001-C
CN8237
8237_070