Astrodata Model 2513 PBX Telemetry Alarm Monitor Portable Field Tester Unit

Astrodata Model 2513 PBX Telemetry Alarm Monitor Portable Field Tester Unit

The Astrodata Model 2513 is a portable field instrument designed for PBX telemetry alarm monitoring and telephone circuit testing. Built into a rugged metal carry case, the unit includes a front-mounted speaker and alarm section alongside external monitor and line level controls, a SELECT switch, and dual HANDSET jacks for direct line access.

Specifications & What's Included

• Brand: Astrodata
• Model: 2513
• Type: PBX Telemetry Alarm Monitor
• Form Factor: Portable field unit with metal carry handle
• Front Panel Controls: EXT MON LEVEL knob, LINE LEVEL knob, SELECT button, ALARM ON/OFF toggle switch, ALARM LEVEL control, ON-OFF rotary switch
• Connectors: Two 1/4" HANDSET jacks (front panel), standard 3-prong AC power cord
• Built-in alarm speaker with front grille
• Metal enclosure — gray finish
• Internal terminal block connector strip and wiring visible at rear (rear panel open)
• Unit only — power cord attached; no additional cables or accessories included

Applications

The Astrodata Model 2513 was used in telecommunications field work for monitoring PBX (Private Branch Exchange) telemetry alarms and telephone circuit parameters. Instruments of this type were used by telephone company technicians and PBX installers to monitor line levels, connect handsets for live listening, and detect alarm conditions on telephone circuits in the field or at remote telemetry sites. The portable, self-contained form factor — metal enclosure with carry handle, built-in speaker, and AC power cord — was typical of field test and monitoring equipment from the 1970s and 1980s, designed for use at central offices, remote sites, or customer premises. The EXT MON and LINE LEVEL controls allowed technicians to set and listen to signal levels on telephone lines, while the integrated alarm section provided audible notification of fault conditions.