cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 214

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

7.0 OAM Functions
7.1 OAM Overview
7-4
7.1.2.3 Performance
Monitoring (PM)
Performance Monitoring includes a set of functions that monitor and process user
information on a channel to produce maintenance information specific to that
channel. This maintenance information is added to the in-rate data flow on that
channel in the form of PM cells, added at the source of a connection or link, and
extracted at the sink of a connection or link. With this maintenance information,
the user can estimate and analyze the transport integrity of that channel.
forward monitoring cells (which carry the forward error detection information),
and backward reporting cells (which carry the results of the performance
monitoring checks).
enables PM for a channel by setting the PM enable bits (PM_EN) in the
Segmentation and Reassembly VCC State table entries for that channel.
user cells on that channel. The size of this block of cells is set by the user, and can
have the value (N) of 128, 256, 512, or 1,024 cells. The CN8237 inserts a PM cell
after every N user cells on that channel. A block size of 0 is valid when the SAR
is a destination point ONLY for PM processing. In this case, the segmentation
coprocessor will only generate Backward reporting cells in response to
reassembly performance monitoring calculations.
establishment, or at any time after the connection has been established.
The PM flow is bidirectional, and PM cells are of two basic function types:
The CN8237 performs PM on up to 128 user-assigned channels. The SAR
The CN8237 performs PM processing on any channel by monitoring blocks of
PM as performed by the CN8237 calculates the following:
• Errored blocks (by means of a BIP-16 error detection code generated over
• A count of misinserted PM forward monitoring cells
The user can activate PM on any channel either during connection
the payloads of the user cells in the PM block)
Mindspeed Technologies
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
™
28237-DSH-001-C
CN8237