ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 273

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

Preliminary
Transmit Data Path Entities
Entity 10: Transmit Buffer (CSKED)
The transmit cell scheduler entity is responsible for receiving a packet from the processor, determining when
cells from the packets need to be transmitted, and passing this information to the segmentation buffer entity.
The logic consists of timers and counters for determining transmit opportunities and interfaces to ARBIT (for
accessing the timing data and descriptors), PCINT (for register accesses), RXQUE (for queuing events),
POOLS (for returning buffers when finished transmitting), and SEGBF (for getting the data from memory to
transmit).
Scheduling Overview
This entity provides traffic shaping to ensure that traffic sent by the IBM3206K0424 conforms to the Quality of
Service (QoS) parameters as defined by the ATM Forum. CSKED provides support for the following QoS
parameters:
CSKED will send out cells at the SCR. If transmit opportunities are missed, as is the case when there is no
data to send, the actual rate will become less than SCR. When data becomes available to send, CSKED will
transmit up to MBS cells at the PCR, until the transmit rate returns to SCR.
pnr25.chapt05.01
August 14, 2000
• Peak Cell Rate (PCR) - The maximum number of cells per second that the connection can transfer into
• Sustained Cell Rate (SCR) - The average number of cells per second that the connection can transfer
• Burst Tolerance - The maximum length of time that the user can transfer at the peak cell rate. Burst Toler-
the network.
into the network. The burst tolerance determines the length of time over which the network measures this
average.
ance can be measured in number of cells, a measurement known as maximum burst size (MBS).
IBM Processor for Network Resources
Transmit Buffer (CSKED)
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IBM3206K0424