
3.1.3. USB Interface
Aside from the serial interface, the Mini-B USB interface (USB slave) may also be
used to directly communicate with the modem.
Figure 20. Mini-B USB Connector
Refer to the following table for the pin description of the mini-B USB connector.
Table 16. Mini-B USB Pin Description
Differential data interface negative
Differential data interface positive
The USR3500 USB slave interface complies with USB 2.0 protocol signaling and
with USB 2.0 electrical interface.
The USB interface features:
• 480Mbit/s high-speed transfer rate
• 3.3V type compatible
• USB Soft-connect feature
• USB Download feature
• CDC 1.1 – ACM compliant
Table 17. USB Electrical Characteristics for USR3500
D-, D+ (Low / Full speed)
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