Base-12 MTP jumper cables
Base-12 MTP jumpers are used to connect fiber optic patch panels with servers and switches in 4-lane parallel architectures. They can also be used to connect two independent trays or modules within centralised cross-connects. Base-12 jumpers are compatible with Base-8 transceivers, but usage will result in a 33 % fiber wastage because SR4 deployments of 40G require only 8 fibers (4 × lanes). Base-12 jumpers are identified by a black boot at the rear of the connector so that users do not mistake it for a Base-8 assembly with grey boot. Base-12 jumpers are fully compatible with Base-8 backbone cables and patch panels, however users should note that 33 % of jumper fibers will be wasted in such a case.