FlexDSL ORION 2 - TECHNICAL DESCRIPTION; Application and General Information about FlexDSL Orion 2 Devices

User Manual NTU Orion 2
10
3 TECHNICAL DESCRIPTION
3.1 Application and general information about FlexDSL Orion 2 devices
FlexDSL Orion 2 devices represent xDSL modems (ITU-T G.991.2– G.shdsl and ITU-T G.991.2
– G.shdsl.bis standards, TC-PAM line encoding). They are designed to organize high-speed
data communication channels over symmetric digital subscriber lines (DSLs) with the
transmission rates from 200 to 5704 kbit/s (with the step of 64 kbit/s). The TC-PAM (Trellis
Coded Pulse Amplitude Modulation) encoding used in these devices well combines such
characteristics as the transmission range, noise immunity and electromagnetic operability. The
number of levels (code states) in TC-PAM is increased up to 32 and a special error correction
mechanism is used. To increase the distance range by 2 or more times, regenerators can be
used.
The family of FlexDSL Orion2 includes devices with G.703 and Ethernet network interfaces.
Thus, the FlexDSL Orion2 equipment provides complex services which allow one to transmit
simultaneously voice and data as well as to construct TDM networks of different topologies
without using expensive interface converter, multiplexers and cross-connect systems.
The devices of this family include network termination units (NTUs) and line termination units
(LTUs), which are installed at the customer (user) premises and the operator (provider)
premises, respectively. In addition, the devices of this family include regenerators. To organize
the “point-to-point” topology, the following schemes can be used: NTU – NTU, LTU – LTU or
NTU –LTU.
The devices can be powered from local DC sources. Regenerators and NTUs can be fed both
locally or remotely from LTUs. Figure 1.1 presents an example of organization of data
transmission systems with the help of modems of the FlexDSL Orion 2 family. Other variants of
the usage of this equipment are also possible.
Figure 3.1 An example of organization of a data communication channel using FlexDSL Orion 2
modems
Orion2
LTU
RGNo2
(remote
power)
RGNo2
(remote
power)
RGNo2
(local power)
Orion2
NTU
SHDSL SHDSL SHDSL
SHDSL
FG-PAM-SRL-E1B/4Eth-RP, V9
FG-PAM-SAN-E1B/Eth, V8
FG-PAM-RGN-xx, V8 FG-PAM-RGN-xx, V8 FG-PAM-RGN-xx, V8
VLAN
Switch
Ethernet
Network
N2
Ethernet
Network
N1
Eth
ATS
G.703 (E1)
G.703 (E1)
ATS
Management PCVoIP
VLAN
Switch
Ethernet
Network
N2
Ethernet
Network
N1
Management PCVoIP
INTERNET
Repeater Point Repeater Point Repeater Point