Motorola MPC8260 User Manual

29-48

MOTOROLA

Table 29-18 describes AAL5-ABR protocol-speciÞc RCT Þelds.

29.10.2.2.3  AAL1 Protocol-SpeciÞc RCT
Figure 29-28 shows the AAL1 protocol-speciÞc area of an RCT entry. 

Table 29-19 describes AAL1 protocol-speciÞc RCT Þelds.

0x0E

Ñ

Ñ

AAL5 protocol-speciÞc

0x16

Ñ

PCR

Peak cell rate. The peak number of cells per second of the current ABR channel. The ACR 
(allowed cell rate) never exceeds this value. PCR uses the ATMF TM 4.0 ßoating-point format.

0x18

0Ð3

RDF

Rate decrease factor for the current ABR channel. Controls the decrease in cell transmission 
rate upon receipt of a backward RM cell. RDF represents a negative exponent of two, that is, the 
decrease factor = 2

-RDF

. The decrease factor ranges from 1/32768 (RDF=0xF) to 1 (RDF=0).

4Ð7

RIF

Rate increase factor of the current ABR channel. Controls the increase in the cell transmission 
rate upon receipt of a backward RM cell. RIF represents a negative exponent of two, that is, the 
increase factor = 2

-RIF

. The increase factor ranges from 1/32768 (RIF=0xF) to 1 (RIF=0).

8Ð15

Ñ

AAL5 protocol-speciÞc

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Offset + 0x0E

Ñ

PFM

SRT INVE STF

Ñ

Offset + 0x10

SRTS_TMP

Ñ

Ñ

SRTS Device

Offset + 0x12

Ñ

Valid Octet Size (VOS)

SPV

Structured Pointer (SP)

Offset + 0x14

RBDCNT

Offset + 0x16

Ñ

SN

Offset + 0x18

Ñ

SNEM

Ñ

RXBM

Ñ