An Intro to AdvancedTCA (PICMG 3.x)
- PICMG is
embarking on its largest and most aggressive effort ever, the
AdvancedTCA (Advanced Telecom Computing Architecture) specification.
Formerly known as PICMG 3.x, the core specification PICMG 3.0
currently contains three sub-specifications. PICMG 3.1 is the
specification for Ethernet and is similar in background to the
PICMG 2.16 specification. PICMG 3.2 is for Infiniband and PICMG
3.3 is for StarFabric implementation.
The specification
is positioned towards the $200 billion and growing telco carrier
grade market. Particularly in telecom central offices, the industry
currently tends to use large, heavy layer-count, and powerful
custom telecom backplanes (see a few Bustronic examples). The
overall system is geared to be NEBS (Network Equipment Building
Systems) compliant. A NEBS compliant product generally implies
that it has been tested to GR-63 for environmental and GR-1089
for the EMI/EMC and safety.
Utilizing
a "mesh" switched fabric topology (with point-to-point
fabric links), the spec will be able to handle the massive bandwidth
requirements, High Availability (99.999% uptime), and Quality
of Service issues demanded by the industry. The form factor will
go to an 8U x 280mm card size plugging into a 6U backplane with
slots spaced at 1.2". The larger cards allow more space for
more components, while the wider spacing between slots allows
for taller components. This is important as many of today's cards
or "blades" are packing more storage, processing, and
memory onto a single card. With the backplane "shorter"
than the cards, there is 2U of space for increased airflow in
the system. This is particularly important for rackmount applications
where cooling intake comes from the front of the chassis, and
has room to flow up the cards and out the rear of the chassis.
In addition, the backplane allows for 48VDC input from an external
source to be distributed to the individual slot cards.
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