6.4 Transceivers Insertion Loss
(Ask a Question)The following table lists the type of insertion loss.
| Type | Trace Distance | Insertion Loss | PCB length | Di-Electric material | Trace width and Spacing |
|---|---|---|---|---|---|
| Short | Connections within a board or through one connector to a daughter card | 6.5 dB at 5 GHz | 8 inches strip-line | Nelco FR-4 | trace width = 7mil, space between the P to N signal = 10mil material |
| Medium | Backplane application with 2 connectors | 17.0 dB at 5 GHz | 24 inches strip-line | Nelco FR-4 | trace width = 7mil, space between the P to N signal = 10mil material |
| Long | Backplane application with 2 connectors | 25.0 dB at 5 GHz | 40 inches strip-line | Nelco FR-4 | trace width = 7mil, space between the P to N signal = 10mil material |
Note:
- For FR-4 and good quality connectors, the insertion Loss is ~0.5 dB per inch at 5 GHz and each connector is ~2.5 dB per connector at 5 GHz.
- Medium reach backplane is meant for an 18” backplane with two 3” length line-card traces.
- Long reach backplane is meant for a 34” backplane with two 3” line card traces.
- DFE Equalization mode is not supported at < 3 Gbps (rates from 3 Gbps to 5 Gbps, including PCI-Express, could be supported with DFE but are not set up to do so in this RX_PRESETS table).