Agilent/Keysight 37778A

The Agilent/Keysight 37778A is a field-portable telecommunications test instrument engineered for detailed analysis of SONET, SDH, and PDH digital transmission systems. It delivers precise measurement of bit error rate, jitter, signal quality, and synchronization performance across multiple network hierarchies. The 37778A supports data rates from 2 Mb/s to 2.488 Gb/s with both electrical and optical interfaces, making it suitable for R&D, manufacturing, and field service environments.

Technical Specifications

• Data Rates: 2 Mb/s, 34 Mb/s, 140 Mb/s (PDH); 155.52 Mb/s (STS-3/STM-1); 2.488 Gb/s (STS-16c/OC-48c, STS-48/STM-16)


• Standards: SONET/SDH, PDH with bulk-mapped concatenated payload support


• Interfaces: Electrical at 155.52 Mb/s; electrical and optical at 2.488 Gb/s


• Optical Wavelengths: 1310 nm and 1550 nm


• Port Configuration: STS-3 drop-and-insert ports for SONET, DS1, and DS3 payload testing

Key Features

• Embedded overhead byte analysis and S1 byte status decoding for synchronization fault isolation


• Multiplexer tributary and line testing at STS-3/STM-1 and STS-48/STM-16 levels


• 2.488 Gb/s thru-jitter generation and measurement with ITU-T compliant jitter tolerance and transfer testing


• Non-intrusive monitoring of live traffic with simultaneous multi-level alarm detection


• Pointer generation and analysis; frequency offset measurement


• Error and alarm generation for network validation

Typical Applications Installation and maintenance of SONET and SDH network equipment. Integration with ancillary test equipment such as the HP 156MTS extends capability to DS1 and DS3 payload testing.

Compatibility & Integration ISO 9001 and TickIT certified manufacturing (BSI Registration Certificate No FM 10987).