The purpose of array connectivity methods is to generate an optical path from the transmit port of one device to the receive port of another device. Different polarity methods to accomplish this goal may be implemented. However, these different methods may not become inter-operable. Any connectivity method requires a specific combination of components to keep polarity. Figure 1 illustrates the corresponding connectivity methods A, B and C to establish polarity for parallel signals using an MPO transceiver interface with one row of fibers.

Compared with polarity methods for duplex signals, there are two variations for parallel signals. First, the MTP/MPO cassettes for duplex signals are replaced with MPO-to-MPO adapters for parallel signals. Second, the duplex fiber patch cords for duplex signals are replaced with 12-fiber patch cords for parallel signals. For the details about the polarity distinctions between duplex signals and parallel signals, you can read “Type A MTP Cassette and Type B MTP Cassette: When and Where to Use?” to know more information regarding polarity options for duplex signals. While for polarity methods for parallel signals, keep reading this post to learn more.

Connectivity Method A for Parallel Signals

When connecting arrays for parallel signals, the Type A backbone is connected on each end to a patch panel. On one end of the optical link, a Type A array fiber patch cord is used to connect patch panel ports to their respective parallel transceiver ports. On the other end, a sort B array patch cord is utilized for connecting panel ports with their particular parallel transceiver ports. In each optical path, there shall be only one Type B array patch cord.

Connectivity Method B for Parallel Signals

When connecting parallel signals, the sort B backbone is linked on each end to a patch panel. Type B array patch cords are then used to connect the patch panel ports to their respective parallel transceiver ports.

Connectivity Method C for Parallel Signals

Connectivity Method C for parallel signals is similar to connectivity method A. The distinctions are Type C trunk cable can be used instead of Type A, and a Type C cross-over patch cord is required at one end and at the various other end, still Type B patch cable used.