Host Interface; Operation Modes; Usb Interface - Sierra Wireless MC5720 Hardware Integration Manual

Host Interface

This chapter provides detailed information about the Host-EM interface,
describing the signals required for serial data transfer, handshaking and digital
module I/O (MIO).

Operation modes

The embedded module supports the following logical communication interfaces:
•
•
•

USB interface

The USB physical interface is the only path for communication between the host
and modem.
General USB background information can be found in the Compaq, Intel,
Microsoft, and NEC Universal Serial Bus Specification.
The USB interface is designed to comply with the Universal Serial Bus
Specification, Revision 1.1. The EM USB interface supports the full-speed
(12 Mbps) data rate, and can be used to transfer general data, phone diagnostic
data, over-the-air data, or voice PCM samples between the module and a USB
host. The USB interface provides 10 endpoints:
•
•
•
•
For more background information on USB, see the Compaq, Intel, Microsoft, and
NEC Universal Serial Bus Specification.
Rev 1.2
A p r - 0 5
Data channel—Supports AT command and PPP packet exchange during
data calls
Control channel—Supports modem control and call processing commands
Diagnostic channel – Supports modem status and diagnostic logging
One bi-directional control endpoint
Isochronous IN and OUT endpoints for voice
Four IN endpoints
Three OUT endpoints
P r o p r i e t a r y a n d c o n f i d e n t i a l
H o s t I n t e r f a c e
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