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SONET jitter tolerance
Last Updated: 12/19/2008
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Title:
SONET jitter tolerance
Questions:
- How do you measure jitter tolerance for SONET?
- What type of SONET testers are available?
- What is the jitter tolerance performance of the CYS25G0101DX?
Response:
Unlike conventional Backplane PHYs, measuring jitter in SONET PLLs requires specialized equipment. The type of jitter source considered for jitter tolerance measurement for SONET PHYs is just sinusoidal modulation. The Jitter tolerance requirements for SONET is specified in section 5.6.2.2.2 of Telcordia Technologies GR-253-CORE issue 3. It is specified for an entire range of frequencies. Jitter tolerance at a specific frequency is the amount of jitter the receive PLL can tolerate without any bit errors.
There are single-unit SONET-compliant jitter testers on the market. These testers have masks for both Telcordia and ITU recommendations. Any common SONET jitter tester will at least include a modulation source, modulator, pattern generator and BERT. There are also some testers that perform these tests using phase noise detection and frequency domain analysis. Some single box units include:
" OmniBER by AGILENT
" MP1570A by ANRITSU
" ANT-20 by ACTERNA
The jitter tolerance exhibited by CYS25G0101DX is shown in Figure 3 of the attached FAQ. The dotted line shows minimum SONET jitter tolerance requirement and the solid line shows the actual performance of the CYS25G0101DX.
Useful Links:
CYS25G0101DX - SONET OC-48 Transceiver (Attached Above 38-02009_OJ_V)
OC-48 Frequently Asked Questions (http://www.cypress.com/cfuploads/support/app_notes/CYS25G0101DX_FAQ.pdf)
Keywords:
CYS25G0101DX, SONET, jitter, tolerance, testers.
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Sunset Owner: GRAA;
Secondary Owner: RAIK;
Sunset Date: 02/28/11
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