Usp Line Card (V.35/X.21/Rs-232) Overview - Alcatel-Lucent OmniAccess 700 Cli Configuration Manual

Release versions: 2.2, 2.2-r02, 2.3

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In synchronous communications, data is sent as frames of sizes that vary from a

few bytes through 1500 bytes for Ethernet or 4096 bytes for most Frame Relay

systems. The clock is embedded in the data stream encoding, or provided on

separate clock lines such that the sender and receiver are always in

synchronization during a frame transmission.

There are two types of devices that communicate over a Serial Interface: DTE

(Data Terminal Equipment) and DCE (Data Circuit-Terminating Equipment).

A DTE connects to a network through a DCE device. In a typical scenario, a DTE

device is connected to a DCE device. The DCE device provides a clock signal that

paces the communication between the device and the router.

V.35/X.21/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

48kbps line transmissions. It has been adopted for all line speeds above

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 X.21. The DCE provides a full-duplex, bit-serial,

synchronous transmission path between the DTE and the local PSE.

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.

CLI Configuration Guide

(V.35/X.21/RS-232) O

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USP Line Card (V.35/X.21/RS-232) Overview