HP ProBook 640 G1, 645 G1, 650 G1, and 655 G1 Notebook PCs - Maintenance and Service Guide

Table Of Contents
Rear (select models only)
Component Description
(1) RJ-11 (modem) jack (select models only) Connects a modem cable.
(2) Serial port Connects an optional device such as a serial modem,
mouse, or printer.
22 Chapter 2 External component identification