Agilent 3776B

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The HP 3776B 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 3776B fulfills the measurement needs of North American/Bell and Japanese systems.

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 3776B cuts test times and allows easier diagnosis of faults.

The 3776B can set and monitor the PCM stream F_T and F_S signalling bits. It can also generate a DS-1 (Extended Framing Format Fe) digital stream containing any framing and signalling bits set by the user. This checks channel bank alignment and alarms. A looped timing check is also available and this indicates whether or not a remote channel bank is loop-timed, in addition to detecting the presence of timing jitter on the line.

• 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, intermodulation using two tones, or using four tones, digital transmit/receive, return loss, loop timing, and more
• Data measurements (option): Envelope delay distortion, absolute delay, phase jitter, re-modulation, transients (amplitude/gain hits, phase hits, interruptions/dropouts, impulse noise)
• Options
  • 001: Data measurements
  • 002: Japanese measurements/connectors same as standard except for: Psophometric weighted filter in place of C-message, 810 Hz default test frequency instead of 1010 Hz, front panel connectors replaced by Japanese I-214 type balanced connector
  • 004: Trompeter triaxial type BJ77 connectors located on the rear panel
• 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
  • Four tone: Lower tones center frequencies 860 Hz ±50 ppm, lower tones separation 6 Hz ±1 Hz, upper tones center frequencies 1380 Hz ±50 ppm, upper tones separation 16 Hz ±1 Hz, relative level of four tones ±0.1 dB, harmonic distribution <-35 dB, spurious <-70 dB
• Analog transmitter levels
  • Maximum output level: Sinewave +10 dB, two tone +7 dBm, four tone +4 dBm, echo return loss 0 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, psophometric (option), 810 Hz notch (option), four-tone intermodulation, C-message/notch (not with Japanese option), 200 Hz high pass, impulse noise (option), phase jitter (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, four tone -3.0 dBm0, echo return loss -7.0 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 AM I (AZS) or B8ZS
  • Impedance: 100 Ω balanced nominal
  • Balanced output amplitude: Mark ±3 V, space ±0.3 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 0.75 MHz
  • Signalling: Selectable as CAS or CCS
  • Digital receiver frame alignment: Automatic
  • Digital receiver multi-frame alignment: Automatic if CAS selected
  • Coding: Selectable AMI (AZS) or B8ZS
  • Impedance: 100 Ω balanced 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 (n+1) exchanged for all timeslots where n is odd
• HP-IB interface: SH1, AH1, T5, L4, SR1, RL1, DC1; Flags - Remote, Listen, Talk, Service Request