Manuals and User Guides for Motorola SB5100 - SURFboard - 38 Mbps Cable Modem. We have 9 Motorola SB5100 - SURFboard - 38 Mbps Cable Modem manuals available for free PDF download: Installation Manual, User Manual, Software License, Warranty, Safety, And Regulatory Information, Safety And Regulatory Information, Reference Manual, Technical Specifications, Quick Reference Manual