User manual

CHAPTER 1： MODEM INTRODUCTION
CHAPTER 1
：
MODEM INTRODUCTION
1.1 Description
•
The Network Series Modem are high performance,
synchronous and asynchronous, full duplex multi-standard modems designed for
use on 2-wire dial circuits and 2/4 wire leased lines.
The MODEM series fully comply with ITU-T V.34
、
V.32bis/V.32
、
V.22bis
、
V.22
、
V.23
、
V.21 and BELL 212A/103
，
speed: 115200 - 300bps Asynch
，
33600 - 1200bps Synchronization
。
In V.34 and V.32bis/ V.32 modes, echo concellation provides 2-wire full
duplex operation over all PSTN circuits including those with satellite sections.
Compatibility is also provided with Bell 212A and Bell 103 operating standard.
•
V.34 mode provide full duplex operation at up to 33.6 kbps speed, with line
probing, symbol rate and carrier frequency selection technologies.
•
V.34 mode also use other advance technologies such as Adaptive Precoding, Non-
Linear Encoding (Warping), Constellation Expansion, Multidimensional Trellis
coding and Shell Mapping ,Tx power back off(Power Reduction).
•
There are 10 factory default profiles and 10 user's profiles for your easiest
configuration setting.
•
Allow up to 16 modem cards with 16 port on a rack shelf (TRS-16).
•
Allow up to 16 modem cards, with 32 port on a rock shelf (TRS-32).
•
A 2 by 16 characters LCD display on the front panel with back lighted control for
configuration set-up and monitoring conveniently.
•
Line status monitoring including transmit/receive signal level, S/N ratio, EQM (eye
quality monitoring), signal quality, frequency shift, delay, echo, retrain count,
phase jitter, Tx/Rx baud rate, Tx/Rx carrier frequency, Tx/Rx DCE speed, TX
power back-off ..., etc.
•
Front panel lock and password protect features prevents from the operation of
unauthorized person.
•
Enable remote configuration through secondary channel.
•
V.13& V.23 simulated carrier control for half duplex application.
•
2 wires or 4wires automatic or manual dial back-up and restore.
2