Cheap OC3 and OC12 Bit Error Tester

Can someone recommend a cheap functional OC3 and OC12 bit error tester for layer 2 testing?

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W
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design and made by your company or youself it is best cheap solve way

Reply to
optics

but the OC3 and 12 the speed is too low, it is difficult for it.

Reply to
optics

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