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Primary reference source VCH-1008CVCH-1008C Primary Reference Source on the base of Passive Hydrogen Maser is intended to be used as the first class SDH synchronization equipment of digital telecommunication networks. Full digital processing of modulation and servo loop signals is realized. Extremely high frequency stability is provided by state-of-the-art technology.
Key applications.
− Digital SDH networks clock synchronization.
Specifications
Output signals:
Sine: 5 MHz; 10 MHz; 100 MHz, (1±0.2) V RMS into 50 Ω load.
Pulse: 2.048 MHz (square pulse), (1.5÷2.8) V (pp) into 75 Ω (ITU-T G.703 part15).
1Hz; 1/60 Hz, positive polarity pulse, width 100±0.01; 10±0.01; 1±0.01; 0,1±0.01 μs, TTL level into 50 Ω, rise time: <15 ns.
Metrological characteristics are given in the table:
| Relative frequency accuracy |
±3·10−13
(factory calibration) |
| Accuracy (over environment) |
≤±1·10−12 |
| Output signals frequency corrector |
resolution
retuning range |
1·10−15
1·10−10 |
Frequency stability
(Allan variance at (25±1)C°, environmental
effects are excluded) |
1 s |
≤1.0·10−12 |
| 10 s |
≤3.0·10−13 |
| 100 s |
≤1.0·10−13 |
| 1 hour |
≤3.0·10−14 |
| 1 day |
≤2.0·10−14 |
| Time errors requirements of ITU-T G.811 / 6.1 and ETS 300 462-6 / 5.1. |
| Maximum Time Interval Error |
Time interval t(s) |
MTIE (ns) |
| 0,1< t ≤1000 |
0.275t+25 |
| t>1000 |
0.01t+290 |
| Time Deviation Error |
Time interval t(s) |
TDEV (ns) |
| 0.1< t ≤100 |
3 |
| 100< t ≤1000 |
0.03t |
| 1000< t ≤10000 |
30 |
Manual synchronization to external 1 pps
TTL signal accuracy |
≤±50 ns |
Magnetic sensitivity |
≤±2·10−14 1/Oersted |
Full digital processing of modulation and servo loop signals.
Digital control and monitoring all operating parameters on LCD display.
Interface: RS-232C; USB; LAN .
Power supply: AC (100÷240) V, (50÷60) Hz; DC (38.4÷57.6) V, two inputs.
Power consumption: 80 W.
Dimensions (W×H×D): 470×200×530 mm.
Weight: 27 kg.
Warranty: 3 years (10 years extended).
Life time: 15 years.
 
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