The FIREBERD 4000 (Figure 1-1) is an instrument that uses internal and modular interfaces to test the quality of digital communications networks and equipment. It provides the analysis capabilities to isolate circuit malfunctions and report the results on the front panel or on a printout. Highly versatile, the FIREBERD 4000 is used in locations such as central offices, technical control centers, end-user sites, engineering laboratories, and earth stations. 1.2.1 Features The FIREBERD 4000 offers these key features and characteristics: • Operates on circuits transmitting and receiving data from 50 b/s to 15 Mb/s. • Complete error analysis with bit, block, BPV, code, character, and frame or CRC errors measured simultaneously. • Set-up panel and display that permits configuration of the unit for any test from the front-panel. • Synchronous and asynchronous testing via internal EIA RS-232-C and MIL-STD-188C interfaces. • CCITT V.35, EIA RS-449, DDS, Tl, G.704, and G.703 testing via modular interfaces installed in the FIREBERD 4000’s rear panel. • Thirteen fixed clock frequencies ranging from 300 Hz to 2048 kHz. ® Generates six fixed data patterns: MARK only, SPACE only, 1:1, 1:7, and 3IN24, 1004Hz. ® Generates seven pseudorandom data patterns: 63, 511, 2047, 2lM, 220-1, 223-l, and QRSS. • Generates user-programmable patterns that include: a synchronous 3- to 24-bit binary test pattern and three asynchronous (three synchronous with Option 4006) 1- to 2000-character hexadecimal test patterns for acceptance testing, stress testing, or simulating live data. • Generates standard FOX message in four asynchronous (one synchronous with Option 4006) character formats: Baudot, BCDIC, ASCII, and EBCDIC. • RS-232 printer/remote controller interface provides access for an external printer for printing test results and unit configurations, or computer-controlled operation for unattended testing from a remote site. • Dual results displays which show any two test measurements at the same time. • Summary test results category that displays key nonzero and “out-of-spec” measurements, eliminating the need to search through long lists of test results. • Histogram analysis displayed in either a graph or list provides a perspective as to how selected results change with time.