 Additionally, extra lines such as +5V DC and DDC / DDC2 signals are not supported using BNC connectors.Beyond around 50 metres, or 30 metres without any active amplification, cable capacitance can become a problem for the analogue signals, noticeably reducing horizontal image resolution and causing poor sync.In these cases, other methods such as using "SPI" digital codecs connected by shielded CAT5 network-grade cable, or even framegrabbing plus TCP/IP networking are employed to transmit the image long-distance, even though it may still travel the first and last few tens of centimetres as analogue VGA, or any of a variety of other standards that the codecs may support.