PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
8 APPLICATION NOTES
8.1 DS1 Application
Figure 86 shows a typical application of the AAL1gator II in a network. Data is received from the
DS3 network and microprocessor and split into 28 DS1 lines. The AAL1gator II segments this
data into ATM cells and transmits it to the UTOPIA. The ATM Routing Table (WAC-187-X)
appends a 6-byte routing tag and transmits the data to an ATM switch fabric as 118 nibbles.
In the transmit to DS3 direction, the ATM Routing Table (WAC-187-X) strips the 6-byte routing
tag and presents the data to the AAL1gator II in a 53-byte cell format. The AAL1gator II then
translates the VPI/VCI information into the logical channel numbers for the T1 line and plays the
data out at the appropriate time.
SRAM
4
To
Switch
Fabric
DS1(1-8)
DS3, B3ZS
DS3 Line
Module
(ATT)
ATM Routing
Table
(WAC-187-X)
DS1(9-16)
AAL1gator II
(PM73121)
DS3MX
PM8318
TQUAD
PM4344
UTOPIA
DS3 LIU
DS1(17-24)
DS1(25-28)
4
4
Microprocessor
Figure 86. Typical DS1 Application
ꢀꢅꢇ
PMC [ PMC-SIERRA, INC ]
