Glossaries

• Bidirectional One-to-One NAT (1:1 NAT)
• Bidirectional One-to-One NAT, or 1:1 NAT, is a networking setup where a private IP address is statically mapped to a corresponding public IP address for both outbound and inbound traffic. This provides specific devices in the internal network with consistent and unique public IP addresses, allowing for direct communication with the Internet and inbound access from external sources.
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• Bipolar with Eight Zero Substitution (B8ZS)
• Type of line code used in T1 and E1 systems, in which a special signal is transmitted whenever eight consecutive zeros are sent of the line. The code is then reinterpreted at the end of the connection as all 0s. The technique guarantees ones density and thus clock reconstruction regardless of the data stream.
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• Bit Error Rate (BER)
• Ratio of received bits that contain errors either due to noise, interference, or bit synchronization errors.
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• Bit Error Rate Test (BERT)
• A test that determines the bit error rate across a given communications network. A predetermined pattern that is known at both the sender and the receiver is sent. The results are compared to the expected pattern to determine the number of bit errors. Alternately, the signal can be instructed to loop back to the sender in which case only one machine is necessary.
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• Bursty Error Second (BES)
• A measure of time during which the line is noisy and service is unavailable to the paying customer.
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• Bit Interleaved Parity (BIP)
• A method used to monitor errors in ATM. A check bit is sent as part of the link overhead for the previous block or frame. Bit errors can then be detected and reported as maintenance information.
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• Bayonet Connector (BNC)
• Type of mechanical connector typically used to connect 10Base coaxial cable to an Ethernet access unit. The design contains two pins on either side of the cord or device that insert and twist into an L-shaped receptor, thus locking it into place.
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• Bipolar Violation (BPV)
• An error that can occur in a T1 or E1 network. When Alternate Mark Inversion is used, a 1 signal is a positive pulse in one clock cycle and a negative pulse in the next clock cycle. When two positive or negative pulses are detected consecutively, the BPV error occurs.
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• Base Station Controller (BSC)
• Device that provides the control functions and physical links between a Base Transceiver Station (BTS) and the MSC (mobile switching center). The BSC typically controls many BTSs and optimizes the power and signals transmitted by them, thus acting as the "intelligence" behind the BTS.
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• Base Transceiver Station (BTS)
• A land-based station in a mobile wireless network that consists of transceivers and antennas. The term BTS is typically used in reference to GSM and CDMA cell phone communications.
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