The T-BERD 211 is a portable test instrument that comprehensively analyzes T1 and TIC transmission systems. Used in the central office and in the field, the T-BERD 211 is used during circuit installation, acceptance testing, and fault isolation. In the central office, the T-BERD 211 can either generate and receive test patterns for out-of-service testing or monitor T1 and TIC circuits without service interruption. In the field, the instrument detects and isolates problems related to customer-owned equipment (e.g., Customer Service Unit (CSU)) and detects problems originating from the T1 span line; no CSU is required for span line testing. The T-BERD 211 offers these key features and characteristics: (1) D4, ESF, and SLC*-96 framing patterns offer compatibility with a variety of framing formats. An unframed mode is also available for applications where framing is not required. (2) Summary Test Results category displays key non-zero and “out- of-spec” results, eliminating the search through long lists of test results. (3) Automatic Configuration Mode lets the T-BERD 211 configure to the proper line rate (T1 or TIC), framing, coding, and pattern. No set-up is required when monitoring live circuits. (4) Simultaneous Logic Error, Bipolar Violation, and Frame Error Analysis with associated error rate, errored seconds, and percent error-free seconds calculations. (5) Signal Analysis with simplex current, signal level, timing slip, and recovered clock frequency measurements. (6) Jitter Analysis with jitter wideband and highband measurements, and a Spectral Analysis option that displays the relative amount of jitter as a percentage of a specification mask. The T-BERD 211 also features a jitter alarm LED that immediately illuminates when jitter is present on the received T1 signal. (7) Pulse Shape Analysis allows you to measure the height, width, rise time, fall time, overshoot and undershoot of a T1 pulse. Pulse shapes can also be measured for conformance to AT&T Compatibility Bulletin 119 or ANSI T 1.403 Network Interface specifications. (8) Slips and Wander measurements identify wander impairments or the potential for frame slips. (9) Logic, BPV, and Frame Error Insertion enables the T-BERD 211 to simulate errors as they actually occur. Errors may be inserted singly, in a burst, or at variable rates. (10) RS-232 Printer/Remote Control Interface allows you to print graphic displays (e.g., pulse shapes) and error analysis results, and to remotely control the T-BERD 211. (11) Results History Buffer stores up to 6 sets of your most recent test results which can be viewed from the front panel (12) All Zeros test pattern allows the T-BERD 211 to test B8ZS and ZBTSI circuits where the zeros are encoded to meet specification requirements limiting excess zeros. When transmitting all zeros, the T-BERD 211 determines if the circuit is capable of transporting B8ZS encoded data. (13) Automated bridge tap detection test allows the T-BERD 211 to more thoroughly evaluate a T1 span for bridge taps. The test automatically generates 21 test patterns which are monitored for errors. The T-BERD 211 displays the cumulative test results and which patterns experienced one or more bit errors on the front panel. It also provides a RESULTS printout which indicates the number of bit errors, errored seconds, and pattern synchronization seconds for each pattern. (14) Automated multipattern test simplifies testing by generating five standard T1 test patterns in 15 minutes, eliminating the need to perform individual tests with each pattern. The T-BERD 211 displays the cumulative test results for the test and which patterns experienced one or more bit errors on the front panel. It also provides a RESULTS printout which indicates the bit error, errored second, and pattern synchronization second results for each pattern. (15) Clear history and printer buffers function allows the T-BERD 211 to clear the history and printer buffers of stored results. (16) Printer squelch function automatically suspends the T-BERD 211 printouts when excessive alarm, error, and severely errored second conditions occur during a test. (17) Optional programmable long user pattern allows a 1- to 2000- character hexadecimal pattern to be transmitted to determine circuit sensitivity to the pattern. The option also provides a minimum/ maximum density stress pattern selectable from the front panel PATTERN switch (MIN/MAX test pattern). (18) Optional T1 ZBTSI encoded Extended Superframe Mode allows the T-BERD 211 to transmit and receive ZBTSI (Zero Byte Time Slot. Interchange) encoded ESF framed T1 data. The option also allows framing errors to be inserted in the ESFz F-bits or Z-bits.