Keysight Agilent 3776A

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The HP 3776A PCM Terminal Test Set makes comprehensive voice and data measurements on 4 kHz bandwidth, analog and digital channels. Besides testing PCM multiplexers and channel banks, these instruments also provide powerful facilities for testing transmultiplexers and digital switching systems. The 3776A fulfills the measurement needs of CEPT/CCITT transmission networks.

The PCM terminal test set performs the measurements needed for both analog and digital testing on 4 kHz channels. It replaces the collection of independent analog and digital test equipment previously used in a mixed system environment with one test set. The measurement capability, built-in intelligence, and ease of use of the 3776A cuts test times and allows easier diagnosis of faults.

The 3776A can set and monitor the framing and signalling bits of the PCM stream - the frame word, non-frame word, TS16 frame 0, and TS16 signalling bits. When control of the frame word is selected, simulated error ratio, frame alignment, AIS, and loss of 2.048 Mb/s signal parameters can be inserted into the output stream of the transmitter, for checking alarms in the PCM multiplex.

• Network test of 4 kHz channels
• Pre-programmed measurement default parameters
• User-modified measurement parameters held in non-volatile memory
• Automatic validity checks carried out on parameter entries
• Measurement sequences can be loaded into non-volatile memory from an external controller
• Once entered, measurement sequences can be run with or without an external controller
• Hard copy measurement parameters results output via HP-IB without an external controller
• VF and 2/1.5 Mb/s interface standard
• Standard measurements: Gain, level, idle state, coder offset and peak codes, noise with tone, quantizing distortion using tone, quantizing distortion using noise, intermodulation using two tones, digital transmit/receive, loop timing, and more
• Data measurements (option): Group delay distortion, envelope delay distortion, absolute delay, phase jitter, re-modulation, transients (amplitude/gain hits, phase hits, interruptions/dropouts, impulse noise)
• Options
  • 001: Data measurements
  • 002: Replace front panel BNC connectors with Siemens 75 Ω unbalanced coaxial (1.6 mm / 5.6 mm) connector
• Analog transmitter signals
  • Sinewave: Frequency range 200 to 3900 Hz, accuracy 50 ppm, resolution 10 Hz, harmonics/spurious >65 dB down
  • Two tone: Frequency range f_A and f_B 200 to 3900 Hz, accuracy 50 ppm, resolution 10 Hz, relative amplitude ±0.1 dB, harmonics/spurious >65 dB down
  • Noise: Frequency distribution (3 dB) 375 to 525 Hz nominal, spectral line spacing 3.9 Hz, crest factor 10.5 ±0.5 dB nominal, repetition rate 256 ms ±50 ppm
  • Group delay (option): Reference frequency range 500 to 3000 Hz, measurement frequency range: 200 to 3600 Hz
• Analog transmitter levels
  • Maximum output level: Sinewave +10 dB, two tone +7 dBm, noise +2 dBm, group delay (option) +5 dBm, envelope delay (option) +5 dBm
  • Minimum output level: -76.5 dBm nominal, resolution 0.1 dB nominal, transmit dBr (TLP) range -20 to +10 dB
  • Flatness: 50 to 200 Hz ±0.3 dB, 200 to 3900 Hz ±0.04 dB
• Analog transmitter output
  • Maximum dc isolation ±56 V
  • Impedance: Selectable 600 Ω / 900 Ω nominal, balanced / unbalanced
• Analog receiver input
  • Noise floor: <-100 dBmp
  • Maximum continuous ac signal level: 9 Vp-p
  • Maximum continuous dc signal level: ±56 V
  • Flatness: ±0.03 dB
  • Receiver dBr (TLP) range: -20 to +10 dB
  • Impedance: Selectable 600 Ω / 900 Ω / 50 kΩ, nominal
• Analog receiver filters: Selective, 3 kHz flat, wideband, 4100 Hz high pass, quantising distortion reference and measurement, psophometric, 810 Hz notch, phase jitter (option), impulse noise (option) 
• Digital transmitter signals: Same as analog transmitter except bandwidth limited to 200 to 3600 Hz
• Digital transmitter levels
  • Maximum output level: Sinewave +3.1 dBm0, two tone 0.0 dBm0, noise -5.0 dBm0, group delay (option) -2.0 dBm0, envelope delay (option) -2.0 dBm0
  • Minimum output level: -60.0 dBm0 nominal, resolution 0.1 dBm0 nominal
• PCM output:
  • Signalling: Rear panel switch selects channel associated signalling (CAS) or common channel signalling (CCS)
  • Frame source: Synthesized from internal source or looped through from digital receiver
  • Coding: Rear panel switch selects HDB3 or AMI
  • Impedance: 120 Ω balanced nominal and 75 Ω unbalanced nominal
  • Balanced output amplitude: Mark ±3 V, space ±0.3 V maximum
  • Unbalanced output amplitude: Mark ±-2.37 V, space ±-0.24 V maximum
  • Overshoot: <10% amplitude
  • Width (at 50% amplitude): 50% ±6%
  • Transition times: <30 ns
• Digital receiver
  • Maximum input level: ±8 V
  • Minimum input level: 6 dB at 1 MHz
  • Signalling: Selectable as CAS or CCS
  • Digital receiver frame alignment: Automatic
  • Digital receiver multi-frame alignment: Automatic if CAS selected
  • Coding: Selectable HDB3 or AMI
  • Impedance: 120 Ω balanced nominal and 75 Ω unbalanced nominal
• Digital receiver filters are the same as the analog receiver up to a channel bandwidth of 3600 Hz
• Digital TTL output (rear panel)
  • Format: Low true
  • Signal levels: TTL, open collector
  • Receiver timing outputs: Framing synchronization, multi-frame synchronization, clock, selected data valid
• Timeslot translation: Contents of TS (n) and TS (16 + n) exchanged
• HP-IB interface: SH1, AH1, T5, L4, SR1, RL1, DC1; Flags - Remote, Listen, Talk, Service Request