The Passport 4400 supports multiple permanent virtual circuits (PVCs), referred to as netlinks, over a single physical port. Netlinks are used in PANL switching to pass PANL traffic between networked Passport units. In addition to PANL, the RFC 1490 frame relay protocol can be passed within a netlink to or from a third-party router or FRAD.
Within each PANL netlink, individual switched virtual circuits (SVCs) can be constructed to pass different types of traffic; for example, one SVC can be used for voice and another SVC for data (both existing within the same PANL netlink). See the example below:
PANL and Passport 6400 Interworking
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