Recently, the EB-LINK computer room stacking line series has supplemented the branch specifications. Two types of branch DAC high-speed cables have been put on the shelves after completing port compatibility verification. They are oriented to the in-cabinet interconnection of core-side high-speed ports and access-side low-speed ports.

One line replaces a batch of modules and jumpers

Only QSFP28 ports are left on the core side, and servers and access switches are still SFP28 computer rooms. In the past, one 100G module plus four 25G modules were required, and eight LC jumpers were needed. Replace with100G to 25G DAC high speed cableFinally, four 25G channels are led out from the same line, which reduces the workload of modules, jumpers and cleaning, and the link insertion loss within short distances is also reduced by a large amount.

The branch direction and line sequence are facing the port table core.

• First draw the port table: which high-speed port is divided into several strips, and which network card or access port each goes to, to avoid splitting the wrong branches.
• Used when the 10G port is connected to the 40G port40G to 10G DAC high speed cable, if the direction is reversed, the link will be directly unable to be trained.
• The branch section is shorter than the main trunk. After being inserted into the first device, the remaining branches cannot be looped back to the opposite cabinet. Hard pulling will bend the gold finger.

Run a link training before putting it on the shelves

After arrival, it is recommended to extract a few from the port table and plug them into the target switch, confirm that the target rate can be stably trained and there are no jitter alarms on the management plane, and then put them on the shelf in batches. EB-LINK performs power-on tests on branch specifications one by one before leaving the factory. The length and number of ports can be confirmed by checking the list.

Branch DACs are suitable for direct connection within a range of three to five meters in the cabinet. Active optical cables and optical module solutions should still be considered when crossing columns or exceeding the conventional range. It is safer to determine specifications based on actual measured wiring distances than to copy a list.