Transceivers for testing networks and adapting to device changes

A test transceiver comprising:

• at least one of a receive optical subassembly (“ROSA”) or a transmit optical subassembly (“TOSA”);
• and
• a controller, wherein the test transceiver is configured to introduce a predetermined transceiver performance error into an optical network;
• wherein the transceiver performance error includes an error associated with an optical signal eye profile.

A test transceiver comprising:

• at least one of a receive optical subassembly (“ROSA”) or a transmit optical subassembly (“TOSA”);
• and
• a controller, wherein the test transceiver is configured to introduce a predetermined error into an optical network,
• wherein the controller is configured to provide erroneous information to a network device of the optical network,
• wherein the erroneous information includes an erroneous identification of the test transceiver or an erroneous identification of an operating parameter of the test transceiver.

A test transceiver comprising:

• at least one of a receive optical subassembly (“ROSA”) or a transmit optical subassembly (“TOSA”);
• and
• a controller, wherein the test transceiver is configured to introduce a predetermined error into an optical network;
• and
• an interface configured to receive a function control signal from a tester, wherein in response to the function control signal the predetermined error introduced into the network is modified.

A method for verifying that a network device of a network is performing according to the network device's specification, comprising:

• coupling each of a set of test transceivers to the network, wherein each of the set of test transceivers is configured to introduce a different predetermined error into the network;
• operating each of the set of test transceivers to introduce the respective predetermined errors into the network;
• and
• monitoring the network device to determine how the network device performs when the respective predetermined errors are introduced into the network.