ACD Automatic Call Distribution Provides a cost-effective method for supervising incoming telephone traffic and associated staff activity. AIS Alarm Indication Signal Replaces the normal traffic signal when a maintenance alarm indication is activated. An AIS signal is transmitted downstream to indicate an upstream failure was detected. BNC Bayonet-Neill-Concelman Connector for slim coaxial cables. This is similar to ones used with Ethernet. BPV Bipolar Violation Indicates the presence of two consecutive one bits of the same polarity on a T carrier line. BRI Basic Rate Interface ISDN subscriber interface. BRI has two bearer B-channels at 64 Kbps per second and a D-channel at 16 Kbps per second. The bearer B-channels are provided for PCM voice, video conferencing, group 4 facsimile machines, and other similar types of transmissions. The data D-channel used to bring in information about incoming calls and take out information about outgoing calls. BRI can also be used to access slow-speed data networks such as videotex and packet switched networks. BRI has two standards: U Interface for 2-wire T Interface for 4-wire
CRC Cyclic Redundancy Check CRC is a common method to establish that the data is correctly received in data communications. This process checks the integrity of a block of data. A CRC character is generated at the transmission end. Its value depends on the hexadecimal value of the number of ones in the data block. The transmitting device calculates the value and appends it to the data block. The receiving end makes a similar calculation and compares its results with the added character. If there is a difference, the recipient requests retransmission. DN Directory Number Unique number (phone number) assigned to each telephone or data terminal. ISDN Integrated Services Digital Network An international plan to migrate the public switched network to the universal implementation of standard digital technology. LSA Line Synchronization Alarm Detection A T1 trunk looses frame synchronization. Frame synchronization occurs when a given digital channel (time slot) at the receiving end is aligned with the corresponding channel (time slot) of the transmitting end as it occurs in the received signal. Usually extra bits (frame synchronization bits) are inserted at regular intervals to indicate the beginning of a frame and for use in frame synchronization. LCR Least Cost Routing A feature that automatically chooses the lowest cost phone line to the destination. OOF Out-of-Frame Condition During T1 transmission, an Out-of-Frame error occurs when two or more of four consecutive framing bits are in error. When this condition exists for more than 2.5 seconds a Red alarm is sent by the OOF detecting unit. Equipment that receives this Red alarm responds with a Yellow alarm. OPX Off-Premise Extension A telephone that is located in a different office or building from the mail phone system. The OPX is connected by a dedicated telephone line. This extension has all abilities of the mail phone system.For AVAYA, NORSTAR, NEC, SAMSUNG, MITEL, PANASONIC, TOSHIBA telephone systems and voicemail call (866)206-2316 or email