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PCA9548A: Master and Slave side I2C line total pull-up resistor calculation when channel x is selected

Part Number: PCA9548A

Hi, team,

I have one question about PCA9548A.

SDA/SCL and SDx/SCx are both pulled up to 3.3V separately, how to calculate the I2C DATA and CLK line total pull-up resistor value? Is it just calculate as resistor in parallel?

For example, when channel 0 is selected, and no other device is connected to I2C bus, is the whole DATA line pull-up resistor 4.7k//4.7k=2.35k? Or still calculate separately?

And for internal switch, is it just a CMOS switch? What is the resistor topology for both side if one switch is ON?

Thanks.

Johnny