Other Parts Discussed in Thread: DS110DF410,
I have a customer who needs assistance with the DS30EA101 and DS110DF410 adaptive equalizers, used in a system transmitting data through a cable at bit rates around 2.5 Gbps.
For these devices, the only numerical specifications for allowable loss are "50 dB at 1.5 GHz" and "34 dB at 5 GHz" respectively. These specifications are not sufficient because:
- They do not control internal reflection within the cable
- The DS110DF410 figure is intended for 10 Gbps only, even though the device also operates at lower rates
The cable they are working with is twisted pair, so the only similar cable mentioned in the datasheets is CAT6. The performance of CAT6 is not specified above 250 MHz. For 2.5 Gbps data, the cable performance must be controlled to at least five times that frequency, and they are not confident that simply extrapolating from the CAT6 specifications is appropriate.
How do they specify an allowable loss versus frequency for the cable? Can you point me to any documentation to assist?
