Jeroen van der Ham wrote:
* A _Port_ MAY have a _source_ relation with up to two _Unidirectional Links_. * A _Port_ MAY have a _sink_ relation with up to two _Unidirectional Links_.
Does this mean that a port might be a sink for two unidirectional links? If so, under what circumstances could it occur that a port could be a sink for more than one link, but not more than two?
A Port typically has two uni-directional links to another device, and two uni-directional crossconnects (crossconnects are also links). So then it has two source relations and two sink relations.
Is a cross-connect a subclass of link?
Freek also brought up an example where a SONET switch with an Ethernet interface. If you just look at the Ethernet Layer, this would appear as a Port with links ("actual link links") to two devices.
What two devices does it have an actual link to? Maybe i'm being dense? Cheers, Aaron