The FIREBERD 6000 (shown in Figure 1-1) is a multifunction communications analyzer that can terminate a variety of communications circuits and analyze the quality of the circuit under test. A rear panel interface slot provides the flexibility to access the circuit at a variety of locations. Locations in which the FIREBERD can be used include: central offices (COs), technical control centers, end-user sites, engineering laboratories, and earth stations. The location where access to the circuit can be gained determines the interface that is installed in the FIREBERD 6000. The interface provides the physical connection to the circuit under test. The interface also provides proper termination, signal conditioning, framing (if required), and timing. See Section 5 for a list of interfaces available for use with the FIREBERD 6000. These interfaces can be divided into the following categories: • DDS Interfaces (DDSLL, DS0A/B, and DS0/A) • T-Carrier Interfaces (T1/FT1, DS1/T1, T1 C/2, and T3) • CCITT Interfaces ( 64K/G.703, 2M/n64, 2M/G.704, and 8M/G.703) • Data Interfaces (RS-232-C, RS-449, V.35, MIL449, 449/V35, andHSSI) • Specialty Interfaces (ISDN, LAB, Diphase, and Access) An optional interface is inserted in the FIREBERD interface slot and then either controlled locally or remotely. This allows the user to operate the FIREBERD locally by using the front panel switches and controls, or remotely by using a suitable remote controller. (Refer to Section 4 for a description of FIREBERD remote control operation.) With the required interface installed, the FIREBERD can be configured to perform in-service or out-of-service analysis of the circuit under test. Analysis results of the circuit under test are accumulated simultaneously and stored internally. Accumulated results can be viewed one at a time, with any two results displayed simultaneously on the front panel. If desired, a variety of printouts (e.g., results print or controls print) can be generated manually or automatically. (Refer to Section 3 for a description of the types of printouts available and how to generate them.)