Struct Cable 

pub struct Cable {
    pub data: DataClass,
    pub emarker: bool,
    pub declared_amps: f64,
    pub length_m: f64,
}

A cable as it physically exists, not as it is marketed.

Fields

data: DataClass

emarker: bool

Whether an e-marker chip is present in the plug.

declared_amps: f64

Current the e-marker declares, in amps. Ignored when emarker is false.

length_m: f64

Implementations

impl Cable

pub fn allowed_amps(&self) -> f64

Current the cable is permitted to carry, in amps.

Without an e-marker the ceiling is 3 A no matter how thick the copper is. This is a protocol limit, not a thermal one — the source has no way to learn the cable is capable, so it must assume it is not.

pub fn max_watts_at(&self, volts: f64) -> f64

Maximum power the cable can pass at a given negotiated voltage, in watts.

pub fn can_deliver(&self, target_watts: f64, volts: f64) -> bool

Whether the cable can reach a target wattage at a given voltage.

pub fn passive_length_is_plausible(&self) -> bool

Whether passive operation is plausible at this length for the data class.

Signal loss scales with length and with frequency, so the faster the class the shorter the passive cable can be. A 3 m 40 Gbps cable exists, but it contains active signal conditioning and costs accordingly — which is why long “Thunderbolt” cables are expensive and short ones are not.

Trait Implementations

impl Clone for Cable

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Cable

impl Debug for Cable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.