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The Gmux-2000 is a cost-effective, modular pseudowire
gateway that provides a high capacity, high-density solution
for transporting multiple TDM links over IP, Ethernet and
MPLS-based networks.
Incorporating ASIC-based pseudowire emulation capabilities,
the Gmux-2000 supports TDMoIP, CESoPSN and SAToP per IETF, MFA
Forum, and ITU-T standards. A choice of interfaces allows it
to relay, concentrate and groom PDH and SDH/SONET traffic over
PSN. Employing HDLCoPSN, the Gmux-2000 also delivers
HDLC-based legacy traffic transparently.
The Gmux-2000 works opposite IPmux TDM pseudowire gateways
or Megaplex integrated access multiplexers for cost-effective,
carrier-class TDM pseudowire access. Together, they provide
carriers with a migration path to packet switched networks,
while enabling them to continue delivering revenue-generating
legacy services. The Gmux-2000 is also an ideal solution for
alternative carriers wishing to add leased line services to
their layer 2 portfolio, as well as to enterprises and
organizations looking for ways to lower their IT expenses on
PSTN connectivity and branch-to-branch communications. Other
applications include cellular backhaul over packet transport.
Additionally, the Gmux-2000 can be deployed as a carrier
grade platform for large voice compression applications,
condensing numerous E1/T1 streams or an STM-1/OC-3 trunk over
E1/T1, SDH/SONET or GbE links. Interoperable with RAD- s
Vmux-2100, Vmux-210 and Vmux-110 voice trunking gateways, it
employs TDMoIP multiplexing and advanced compression
algorithms, as well as voice activity detection and silence
suppression, to achieve up to 16:1 bandwidth savings. Such an
effective compression ratio enables the unit to transmit up to
112 E1/T1 links over as few as seven E1/T1s, or over a single
GBE link, while maintaining carrier-grade voice quality. By
optimizing signaling channels as SS7, PRI and others, the
Gmux-2000 further reduces the overall required bandwidth.
System description
The Gmux-2000 is a 6U-high chassis, mountable in a 19-inch
ETSI or ANSI rack. It features the following modules:
- Up to two GbE network uplink modules
- Two control modules
- Three AC or DC power supply modules
- Seven I/O modules (E1/T1 Ch. T3 and Ch. STM-1/OC-3
interfaces, or voice compression modules)
- A cooling fans module
Gigabit Ethernet network modules, each with a pair of
redundant Gigabit Ethernet (GbE) ports, support Ethernet IEEE
802.3ad, 802.1Q (VLAN tagging) and VLAN stacking (Q-in-Q).
Traffic classification is performed per 802.1p, IP ToS/DSCP or
MPLS EXP bits.
E1/T1 pseudowire (PW) modules encapsulate E1/T1 traffic
flows for transmission over packet network via the GbE network
module. Several versions of the pseudowire module are
available:
- E1/T1 modules with 28 external E1 or T1 interfaces for
applications where individual E1/T1 ports are needed to
interface with TDM devices.
- E1/T1 circuit emulation (PW) server modules are used
together with the STM-1/OC-3 interface modules. Each E1/T1 PW
server module is used to extract 21 E1 or 28 T1 internal
channels coming from the channelized STM-1/OC-3 interface
module and convert them to TDM pseudowire traffic flows.
T3 PW module includes a channelized T3 external interface,
which carries 28 T1 data streams. Each internal T1 stream is
emulated over PSN using TDMoIP, CESoPSN, SAToP, or HDLCoPSN
pseudowire encapsulation. A fully equipped Gmux-2000 supports
up to 7 channelized T3 modules (196 internal T1 data streams).
STM-1/OC-3 PW modules perform SDH/SONET
multiplexing/demultiplexing of channelized STM-1/OC-3 trunks
into separate, internal E1/T1 circuits (requiring E1/T1 PW
server modules). Up to 63 E1 or 84 T1 internal channels are
mapped into VC-12 or VT-1.5 streams to or from the channelized
STM-1/OC-3 interface.
Each STM-1/OC-3 interface module provides a pair of ITU-T
G.703 coax or G.957 fiber optic links, supporting 1+1
redundancy according to ITU-T G.783.
Voice compression modules
The Gmux-2000 supports up to seven voice compression modules,
each capable of handling 12 or 16 incoming E1/T1s. The
compressed voice is transmitted over the E1/T1 main link ports
on the module itself, or through the internal bus to the GbE
network module. These modules function as server modules,
meaning they can receive the voice directly from the PBX/MSC
(via a direct Telco cable), or they can process voice coming
in from an STM-1 module. In addition, they can operate in
point-to-multipoint topologies. This brings the maximum
capacity of the Gmux-2000, when functioning as a central site
voice trunking gateway, to 3,472 voice channels.
Control modules provide the SNMP and management
interfaces, as well as database storage, enabling
configuration and control of the entire Gmux-2000 system. Each
control module provides redundant interfaces for connecting
external G.812 station clocks and for alarm inputs/outputs. In
addition, the Gmux-2000 supports Syslog (RFC3164) to enable
remote reporting of alarms and traps to an external Syslog
server.
Power supplies are hot-swappable plug-in modules. Up
to three AC or DC power supply modules can be installed for
load-sharing and redundancy. Two modules are required to drive
a fully equipped Gmux-2000 system.
Service-center management and security
The Gmux-2000 features flexible management capabilities,
including local management via an ASCII terminal (RS-232). In
addition, remote management can be performed either inband or
out-of-band, using one of the network ports or the dedicated
management port, while maintaining separation between
management and user traffic via the use of VLANs. Advanced
FCAPS (Fault, Configuration, Accounting, Performance,
Security), service provisioning and diagnostic tools are
provided by RADview-SC/TDMoIP, RAD- s network management
system, via an SNMP-based GUI.
The Gmux-2000 also supports a variety of configuration
access channels, including CLI over Telnet, SNMP and TFTP.
Incorporated security features include Secure Shell (SSH),
secure FTP (SFTP), SNMPv3, and RADIUS, as well as management
access control list (ACL).
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