name: VC
full_form: Virtual Circuit
context: The OTA AAS BS architecture does not have a conducted interface and so the antennas cannot be disconnected. This means that the conducted methods where the EMC antenna ports are terminated are no longer be possible and hence new methods for EMC testing are needed. Figure 8.1-1 shows the prime difference in architecture from an EMC view point when comparing the ports on a conventional non-AAS BS to the ports on an AAS BS. Figure 8.1-1: Comparison between BS architectures for EMC testing Since the antenna array for the OTA AAS BS is integrated within the BS, the transmissions from the BS within the test chamber have antenna gain included in them. Figure 8.1-2 illustrates the status of EMC antenna ports during EMC testing where it is noted that the ports are connected to a terminating load and the hybrid AAS BS is then set to transmit at full power. Figure 8.1-2: EMC Antenna port status during EMC testing
description: Virtual Circuit (VC) is a technology used in ATM transport for establishing direct bearers between network elements, specifically between the Node B and the Serving RNC (SRNC). It involves setting up permanent virtual paths to enable full mesh connectivity. However, this approach can lead to an impractical multiplication of virtual channels needed, resulting in increased network complexity.
explanation: The context describes VC as a method for establishing connections within a telecommunications network using ATM transport.  It outlines its purpose, functionality (setting up virtual paths), and potential drawbacks (increased complexity). This clearly positions VC as a technological concept.
section_title: 5.3.10	Use of VC- and AAL2 switches
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