MPO MTP jumper various polarity analysis

Common Duplex Jumper Connector Polarity

A polarity (also known as AB type):

The A end of the A connector of the double-core jumper corresponds to the B end of the B connector, and the B end of the A connector corresponds to the A end of the B connector.

B polarity (also known as AA type):

The A end of the A connector of the double-core jumper corresponds to the A end of the B connector, and the B end of the A connector corresponds to the B end of the B connector.

MPO/MTP multi-core jumper connector polarity

After introducing the dual-core connection, let's take a look at the polarity of the MPO/MTP connector (take 12-core as an example).

A polarity:

The key of the A connector of the MPO/MTP jumper is upward, and from left to right are 01, 02, 03, 04 ... 11, 12 cores. Corresponding to the key up of the B connector Key is 01, 02, 03, 04 ... 11, 12 cores.

B polarity:

The key of the A connector of the MPO/MTP jumper is upward, and from left to right are 01, 02, 03, 04 ... 11, 12 cores. Corresponding to the key up of the B connector, there are 12, 11, 10, 09 ... 02, 01 cores.

C Polarity:

The key of the A connector of the MPO/MTP jumper is upward, and from left to right are 01, 02, 03, 04 ... 11, 12 cores. Corresponding to the key up of the B connector Key is 02, 01, 04, 03 ... 12, 11 cores.

MPO/MTP Adapter Polarity

MPO/MTP adapters also have polarity distinctions, which are divided into A and B polarities.

A polarity:

Connect the key up to the two MPO/MTP connectors on the key down.

B polarity:

Connect the two key up MPO/MTP connectors.

The basic product to realize the modular transition - the module box

MPO/MTP connectors and conventional connectors are generally converted and connected through MPO/MTP module boxes. Its basic structure is: box body, MPO/MTP branch jumper, conventional adapter, MPO/MTP adapter.

The application effects of various polarity jumpers in actual wiring and their respective advantages and disadvantages

After introducing the MPO/MTP polarity, let's take a look at the application of these polarity MPO/MTP jumpers in actual wiring:

High Density Data Center Cabling

Used in high-density data centers, MPO/MTP jumpers can simplify wiring and reduce the number of jumpers used. Let's take a look at the effects that can be achieved by using MPO/MTP jumpers with different polarities.

1. A polarity MPO/MTP jumper

Wiring is done with A-polarity MPO/MTP jumpers connected to the module box via a Type A MPO/MTP adapter. The device interface is connected to the MPO/MTP module box, and two types of double-core jumpers with different polarities are used at both ends, which is complicated in practical applications and is not easy to maintain.

2.B polarity MPO/MTP jumper

Wiring is done with B-polarity MPO/MTP jumpers connected to the module box via a Type A MPO/MTP adapter. The device interface is connected to the MPO/MTP module box, and a polarity double-core jumper is used at both ends. This kind of application uses the same jumper at both ends, which is convenient for management. However, in the figure below, 1.2 cores at one end correspond to 11 and 12 cores at the other end. If the two ends correspond, you need to use two types of MPO/MTP module boxes.

3.C polarity MPO/MTP jumper

Wiring is done with C-polarity MPO/MTP jumpers connected to the module box via a Type A MPO/MTP adapter. The device interface is connected to the MPO/MTP module box, and a conventional double-core jumper is used at both ends. Both ends of this application use the same jumper and MPO/MTP module box, which is convenient for management. But this connection can only be upgraded to 40/100G network.

40/100G data center MPO/MTP pre-connected jumper wiring

In the 40/100G network, we use A polarity and B polarity MPO/MTP jumpers for wiring

1. Mixed use of A polarity and B polarity jumpers

The backbone uses B-polarity MPO/MTP jumpers, and the A-polarity MPO/MTP jumpers are used between the equipment and the distribution frame, and the A-polarity MPO/MTP adapters are used for docking of the jumpers. If the A-polarity MPO/MTP jumper is used for the backbone, the A-polarity and B-polarity MPO/MTP jumpers need to be used respectively to connect the equipment at both ends to the distribution frame.

2. Use B polarity MPO/MTP jumper alone

All MPO/MTP jumpers use B polarity jumpers, and MPO/MTP adapters also use B polarity. In this wiring method, jumpers and adapters are relatively uniform, and there is no need to consider polarity issues when wiring. This type of wiring alone does not support the use of single-mode APC MPO/MTP connectors.

To upgrade from 10G network to 40/100G network, we often use the above two wiring methods. Why can't C-polarity MPO/MTP jumpers be upgraded to 40/100G networks? Let's take the 40G network as an example. The 40G network transmission only uses 8 cores to send and receive signals (1-4 cores for reception, 9-12 cores for transmission).

The corresponding relationship between the optical module on the left and the optical module on the right is as follows: 12-core TX1 on the left corresponds to 1-core RX1 on the right, 11-core TX2 on the left corresponds to 2-core RX2 on the right, and so on. However, if the C-polarity MPO/MTP jumper is used for wiring, the corresponding relationship between the fiber cores can only be that 12-core TX1 corresponds to the right 11-core TX2, and the left 11-core TX2 corresponds to the right 12-core TX1, which cannot form a transceiver link. This is why the high-density network that used C-polarity MPO/MTP patch cords for wiring before cannot be upgraded to a 40/100G network.