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OmniAccess 5510 USG - Release Notes
September 2010
USP (Universal Serial Port)
The serial interface or USP provides a single WAN serial interface. The serial interface can support V.35 and
X.21 at 2.048 Mbps bidirectional, and RS-232 in DTE mode at 256Kbps bidirectional. V.35, X.21 and RS-232
are well known communication protocols over synchronous serial lines.
• V.35 Interface
The V.35 interface was originally specified by CCITT as an interface for 48 Kbps line transmissions. It
has been adopted for all line speeds above 20 Kbps. V.35 is a mixture of balanced and common earth
signal interfaces. The control lines including DTR, DSR. DCD, RTS, and CTS are single wire common
earth interfaces. The data and clock signals are balanced signals.
• X.21 Interface
The physical interface between the DTE and the DCE is defined in ITU-T recommendation as X.21. The
DCE provides a full-duplex, bit-serial, synchronous transmission path between the DTE and the local
PSE. It can operate at data rates from 600 bps.
• RS-232 Interface
RS-232 is specified by Electronic Industries Association. It specifies signal voltage, timing, function, a
protocol for information exchange, and mechanical connectors. Signal function includes signal for ground,
data interchange, flow control, control of the remote modem, modem status and control signals. For
synchronous communication, these signals provide timing information for the transmitter and receiver,
which may operate at different baud rates.
10/100 Switched Ethernet Ports
The 10/100 Switched Ethernet ports provide Layer-2 switching functions. The L2 ports are 4 RJ-45 interfaces.
These interfaces can auto-negotiate, transmit, and receive data packets at the rate of 10/100 Mbps.
10/100 Fast Ethernet Port
The Fast Ethernet port provides layer-3 connectivity and can auto-negotiate, transmit, and receive data packets
at the rate of 10/100 Mbps.
USB Port
This port is used to connect a USB device for software upgrades, backup, and restoring data.
Page 8 of 33 OmniAccess 5510 USG - Release 3.0
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