Please note that JavaScript and style sheet are used in this website,
Due to unadaptability of the style sheet with the browser used in your computer, pages may not look as original.
Even in such a case, however, the contents can be used safely.
NEC's 3000 Series SDH (Synchronous Digital Hierarchy) Microwave Radio Systems are designed to provide high-quality SDH radio links. The 3000S operates in frequency bands from 4 to 11 GHz for long-haul transmission. The 3000S transmits several different STM-1 (155 Mbps) signals using a switchover protection system, and wayside signals.
The most efficient modulation techniques are used in full compliance with standard RF channel spacing as recommended by ITU-R.
30 MHz spacing: 128 QAM
40 MHz spacing: 64 QAM
Therefore, 3000S radio systems allow users to continue operation without any modifications to existing frequency allocations.
