How can this layout be improved for Ethernet?

How can this layout be improved for Ethernet?

How can this layout be improved? (Gigabit Ethernet with discrete magnetics and POE) No there is nothing majorly wrong with the layout, it turns out that the ethernet transformer was out of spec by 0.2dB on Insertion loss, when paired with the PHY IC we are using.

Can a differential pair be routed on the same layer?

While routing a differential pair, both the traces should be routed on the same layer so that the impedance requirements are met as shown in figure (13). Also, the same number of vias should be included in the traces. Figure 13: Route pairs on the same layer and place the same number of vias.

What’s the best route for a high speed PCB?

Keep 135⁰ trace bends instead of 90⁰ while routing high-speed signals. The bends should be kept minimum while routing high-speed signals. If the bends are required, then 135° bends should be implemented instead of 90°as shown in figure (5, Right side). At 90 degrees, smooth PCB etching is not guaranteed.

Is there anything noticeably wrong with the Gigabit Ethernet layout?

No there is nothing majorly wrong with the layout, it turns out that the ethernet transformer was out of spec by 0.2dB on Insertion loss, when paired with the PHY IC we are using. Is there anything noticeably wrong with the PCB routing of the gigabit ethernet?

How are traces routed in a magnetic router?

Traces are routed as diff pairs, and with the best possible spacing to prevent cross talk. Minimum use of vias/stubs of 2 per a segment. They are symmetrical as possible, and post magnetics each pair is matched to within 1.25mm, pre magnetics they are matched to within 2mm.

Are there any design constraints for Gigabit Ethernet?

Gigabit Ethernet has many design constraints, due to the layout of components on the PCB it is at times impossible to follow all the design rules. This design is required to perform Gigabit speeds, and feed a POE supply. It must also pass FCC EMC/EMI and ESD testing.