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The PLC of one unit is 500 meters away from the operation station, and fiber optic communication is used. The question is: since there are two branches welded together within a single fiber, is one of them used for receiving data and the other for sending data? How are the functions of sending and receiving defined?
We have used Yokogawa’s DCS system. It is multi-mode light. There are four pairs, and three pairs have been used.
Fiber optic communication generally uses pairs, one for reception and one for transmission, with cross-connection to link the transmitter to the receiver. Only those that transmit signals in one direction use just one cable, such as cable TV
Fiber splitting: one core is considered a pair, with one for transmission and one for reception; no definition is needed.
No special definition is needed; just send and receive, or receive and send
There’s no need to define transmission and reception; currently, there are transceivers with single-core transmission and reception functions, and those interested can learn about them*
Single-core transceiver operation is possible; however, the addition of an optical converter increases the cost of the transceiver. Since it operates in half-duplex mode, the communication speed decreases. That’s why fiber optic communications always use pairs of transceivers for transmission and reception!
Reply to 4# WXJ198354: For fiber splitting, one core is considered a pair – one for transmission and one for reception; is it not necessary to define this? Why is one core called a pair? Isn’t it only two cores that make a pair? Like the KVV-2X1.5 cable.
I didn’t explain it clearly enough: what is plugged into the fiber optic junction box is a pigtail. A pigtail consists of one cable with two connectors, one for transmission and one for reception. Reply 8# cosmicrover
Could I get access to the information on the 6th floor? My understanding is that whether it’s single-mode or multi-mode fiber optics, there must be one transmitter and one receiver; redundant backups don’t count
Transmission and reception are not defined by fiber optics; what matters is whether there are definitions for transmission and reception on the optoelectronic converter, or whether there are arrow indicators on the optoelectronic module of the switch