The EXFO America Test Jumper, Catalog Number TJ-B88-88-20M (Millennium part #524712) is a 20-meter fiber optic test jumper used alongside EXFO OTDR and power meter equipment to establish accurate launch and receive reference measurements. Precision-terminated connectors minimize insertion loss and back-reflection, helping technicians achieve clean, repeatable OTDR traces during fiber optic cable acceptance testing and troubleshooting. Its 20-meter length is long enough to overcome the OTDR's near-end dead zone, a critical step for accurately characterizing the first connector or splice in a link. This test jumper is an essential accessory for any technician performing rigorous OTDR-based fiber network certification.