Marconi IFR Aeroflex 2850BS Digital Transmission Analyzer

The Marconi IFR Aeroflex 2850BS Digital Transmission Analyzer is a dual-mode instrument for testing and analyzing digital communication systems across PCM and data transmission protocols. It delivers error performance analysis, signal generation, and comprehensive measurements across multiple international standards and framing systems, serving development, maintenance, and gateway validation workflows.

– Technical Specifications

Data rate coverage spans 50 bit/s to 2.5 Mbit/s in 1 bit/s increments. Framed and unframed operation is supported at 2048 kbit/s and 8448 kbit/s, with optional rates at 1544 kbit/s (T1) or 704 kbit/s. Channel testing accommodates 56 kbit/s and 64 kbit/s channels within T1, 704, 2048, and 8448 kbit/s signals per G.704/G.744. Multi-channel n×64 kbit/s testing handles both contiguous and non-contiguous channel selection within primary rate signals.

Frequency deviation: up to ±96 kHz (2 kHz steps below 2.5 MHz; 8 kHz steps above). Frequency stability rated ±5 ppm across 0°C to 55°C; ±3 ppm/year drift. Test pattern generation includes all-ones signal with zeros programmable as M×10⁻ᴺ (M=1–9, N=2–7).

Error analysis covers G.821, G.921, G.826, M.2100, and G.962 standards. Severely Errored Seconds, Degraded Minutes, and Errored Seconds thresholds are monitored. CRC block error injection to G.962 is available for 2048 kbit/s ISDN systems. Burst error tolerance suits rapid-fade environments.

– Key Features

• Data interfaces: RS-232, X.21 (X.24), V.35, RS-449 (V.36); optional EUROCOM codirectional and contradirectional modes
• PCM framing for European and North American hierarchies; hybrid and all-bit-rate versions available
• Propagation delay, frequency deviation, frequency and level measurement, DTMF, and CAS analysis
• Loopback capability for framed operation at 704, 1544, and 2048 kbit/s
• DC power and internal battery operation options
• Remote control via RS-232 or IEEE-488 with optional PC applications software

– Typical Applications

International gateway testing with mixed European/North American traffic; ISDN maintenance and validation; T1/E1 channel characterization; transmission equipment development and field service.

– Compatibility & Integration

The 2851 model variant adds standard data interface testing. Structured data option enables X.50, 6+2, and reiterated system testing. Global deployment through European, North American, and hybrid configurations.