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(Advanced Telecom Computing Architecture) A carrier grade backplane and interconnect specification developed by PICMG and defined under the PICMG 3.x standards. Designed for industrial strength telecom equipment and datacenter servers, AdvancedTCA cards are 14" high (8U) and may reside in single slot cabinets or cabinets up to 23" wide that hold 16 cards.

AdvancedTCA (ATCA) provides point-to-point, dual star and mesh topologies for Ethernet, Fibre Channel, InfiniBand, StarFabric, PCI Express and Serial RapidIO channels up to a total bandwidth of 2.5 Tbps. The first implementations of AdvancedTCA appeared in 2003.

Mezzanine Cards and Small Form Factor
The Advanced Mezzanine Card (AdvancedMC or AMC) is a daughterboard that is only 3" high and either attaches onto an AdvancedTCA card or plugs directly into a MicroTCA cabinet. AdvancedMC cards and MicroTCA backplanes provide a small form factor version of AdvancedTCA. See PICMG.

An AdvancedTCA "Shelf"
Designed to fit into a 19" wide rack, this shelf (cabinet) from Schroff has 12 ATCA node slots and two hub slots (middle). The hub slots provide a dual star configuration to the nodes. (Image courtesy of Schroff Electronic Solutions,

The Smaller Form Factor
This PICO-1US is a MicroTCA development and test system from CorEdge Networks. It includes a controller and slots for two single AMC cards or one double-wide card. (Image courtesy of CorEdge Networks, Inc.)
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"The speed at which we can collaborate and develop such a powerful design speaks volumes to 4G LTE equipment vendors who simply cannot waste any time to get to market," said Marc Leclaire, AMC, MicroTCA, ATCA(R) Switch product manager at Kontron.
The MRF is managed by a NAT MicroTCA Carrier Hub (MCH) containing a 16 port GbE switch.
AMP5070, 1U application-ready, MicroTCA system:
There also are some standards still being developed: IEEE 1149.6 for testing high-speed AC-coupled buses; IEEE 1532 for concurrent programming of multiple devices on-board; IEEE P1687, a preliminary standard for embedded test instrumentation; Intel IBIST for embedded self-test of high-speed buses; JEDEC's STAPL standard for on-board programming; the System JTAG initiative; and PICMG's MicroTCA standard, which includes JTAG as an optional test method.
The Momentum(TM) Series AXA-100 AMC represents the industry's next-generation mezzanine standard supporting high-speed interfaces for use in both AdvancedTCA(R) as well as MicroTCA systems.
VadaTech announced an 8U high chassis compliant with the MicroTCA.4 specification that offers N+1 redundant power to 4,400 W.
The compact MicroTCA platform OM6040D from Kontron (Eching, Germany) is specifically designed for up to 4 high-end AdvancedMCs and has a 10 Gbit/s Ethernet switched backplane enabling high data flow rates.
Having used microTCA and other modular technologies to develop both their WiMAX and LTE telecommunications infrastructure equipment, they faced the challenge of dealing with high heat and restricted air flow in their system.
In addition, the high availability MicroTCA system comes loaded with the company's NexusWare(R) Carrier Grade Linux(R) OS and development environment, and remote systems management software, NexusWare Portal.
The LTE User Equipment Simulation system is based on Catapult's new t600 microTCA chassis combined as a peripheral with its flagship DCT2000 m500 platform.