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Hardware Reference 47
C613-03087-00 Rev E
PCI Accelerator Cards (PACs)
PCI Accelerator Cards (PACs) provide additional processing features or
performance, but do not add extra physical interfaces to the router. A PAC can
be installed in the dedicated PAC slot on AT-AR725 and AT-AR745 routers. The
AR750S, AR750S-DP, and AR770S routers have an inbuilt high performance
encryption processor, and therefore do not have a PAC slot.
!
Warning PACs should only be installed by authorised service
personnel. Unauthorised opening of the router’s lid may cause danger
of injury from electric shock, damage to the router, and invalidation of
the product warranty.
Two PACs are available:
■ AT-AR060 EPAC, Encryption PAC.
■ AT-AR061 ECPAC, Encryption/Compression PAC.
How PACs work PACs provide AR725 and AR745 routers with high performance hardware-
based encryption and/or compression services. PACs have a DMA slave
processor, which operates independently of the base system. This processor is
responsible for the transfer of data between the base system and the PAC, and
the control of local high speed encryption and compression data processing
devices.
This architecture allows data encoding to be performed off-line without
involving the base router processor, thereby maximising PAC performance
while at the same time minimising impact on the router.
The PAC is a single card. Figure 19 shows the layout of the board for an
AT-AR061 ECPAC.
Figure 19: Location of main components on the AT-AR061 ECPAC card
PAC Connector
Holes for PAC fasteners
Hole for PAC fastner
PAC