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Voice Compression
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VMUX-2100
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Features |
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Supports bandwidth efficient
transmission of up to 16 E1, T1 or PRI voice trunks over a
single IP or E1/T1 link.
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Simultaneous transmission over IP and
TDM networks
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Unique TDMoIP Multiplexing, together
with various voice compression algorithms, provides up to
16:1 effective bandwidth utilization
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Single Ethernet and redundant E1/T1
uplink ports available
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Bandwidth is dynamically allocated
according to Voice Activity Detection and silence
suppression
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G.168 Echo Cancellation of up to 16
msec per channel
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Group III Fax relay support, at rates
of 2.4 to 14.4 kbps
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Transparent modem support for all
common rates and standards
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QoS support:
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Supports HDLC Channel Compression
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DTMF/MFR2/MFC signal detection,
generation and relay
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Signaling supported:
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Transparent CAS signaling,
including R2 and E&M
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Transparent CCS signaling,
including ISDN, QSIG and SS7
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Management via user terminal, secured
SNMP and Telnet
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Enhanced local and remote diagnostics
tools
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Hot swappable voice modules
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Optional dual hot-swappable power
supply modules for load sharing and redundancy
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Compact 1U-high platform, compatible
with 19" racks
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Description |
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Vmux-2100 is a modular Voice Trunking
Gateway that compresses and transports up to 16 E1 or T1
voice trunks over E1, T1 or IP links. Vmux-2100 employs
G.723.1, G.729 Annex A and G.711 compression algorithms,
together with RAD's unique TDMoIP Multiplexing, to transmit
up to 480/384 voice channels, including transparent CAS and
CCS signaling, over a single E1/T1 or IP link.
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Voice Activity Detection and silence
suppression techniques are used by Vmux-2100, so that
bandwidth is only allocated when it is required, thus
conserving bandwidth. The gateway detects, generates and
relays DTMF/MFR2/MFC signaling.
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Vmux-2100 supports relay of Group III
fax, as well as all common modem rates and standards. Modem
transmissions are handled as voice band data.
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Vmux-2100, only 1U-high, is a compact
modular unit, that can be installed in 19" racks. The unit
consists of up to four Voice Compression modules, a single
Main Link module, and up to two power supply modules. All
modules are plug-in and field-replaceable. Power supply and
Voice Compression modules are hot-swappable.
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Vmux-2100 is unique in that it is a
single device that can provide compressed voice transmission
over both TDM and IP networks, and easily switch between
them whenever this may be advantageous or necessary.
Switching transmission between TDM and IP links does not
require additional investments in equipment and only minimal
configuration changes.
MAIN LINK MODULE
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The Main Link module features a
single 10/100BaseT UTP or fiber optic Ethernet port with
optional Auto-Negotiation support. The Ethernet port
operates at 10/100 Mbps speeds, half and full duplex. The
Ethernet interface is compliant with the IEEE 802.3
standard. It supports full Auto-Negotiation according to
802.3x flow control for full duplex, and backpressure option
for half duplex.
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In addition to the standard Ethernet
port, the Main Link module can also be ordered with a
redundant pair of E1 or T1 ports with RJ-45 connectors.
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E1/T1 link redundancy is controlled
by the main board host, based on physical alarm reports,
providing automatic switching between the redundant E1/T1
links in case of a link failure.
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Ethernet performance monitoring and
statistics are available for frames received and sent to the
IP network, collisions, deferred transmission and carrier
sense errors (RFC 1643).
VOICE COMPRESSION MODULES
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Each Vmux-2100 Voice Compression
module includes 2 or 4 E1/T1 ports. The timeslots received
from the PBX E1/T1 trunks are compressed by the modules
using standard G.711, G.723.1, or G.729.A algorithms. The
compressed payload bytes are then encapsulated into a TDMoIP
frame that runs over IP. The size and packetizing interval
are user-configurable. The Ethernet frames are forwarded to
the Ethernet switch, which sends them to one of the main
links: 10/100BaseT or E1/T1.
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Timeslots are grouped together into
bundles. A different destination IP address can be
configured for each bundle to support any-to-any
connectivity (see Figure 1).
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Vmux-2100 utilizes the Voice Activity
Detection mechanism that prevents sending packets when no
voice activity is detected, to increase bandwidth
utilization and thus support a higher number of voice
channels over TDM links
than is possible using conventional voice compression
methods alone. By TDMoIP Multiplexing and grouping the
timeslots of G.723.1 compressed voice together into bundles
with a common IP address, actual link bandwidth used per
channel can be reduced to as low as 4 kbps (a reduction of
16:1). This enables a single Vmux-2100 unit, fully equipped
with four 4-port Voice Compression modules, to compress and
transmit up 16 E1 or T1 trunks (480/384 voice channels) over
a single 2 Mbps E1 or 1.5 Mbps T1 link (see Figure 3).
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CAS and CCS signaling are
transparently transmitted
end-to-end (see Figure 2). Vmux-2100 transmits HDLC-based
CCS signaling protocols such as SS7, ISDN and QSIG as HDLC
over IP. HDLC frames are removed, and any signal payload is
sent in an IP packet. For ISDN and QSIG protocols, this
results in significant bandwidth savings.
QOS SUPPORT
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Vmux-2100's IP port complies with all
relevant Ethernet LAN standards, such as IEEE 802.3 and
802.3u. It provides reliable, high quality of service (QoS),
by optional VLAN tagging and priority labeling according to
IEEE 802.1p&q.
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The user can configure the ToS (Type
of Service) of the outgoing IP frames. This allows an
en-route Layer-3 router or switch, which
supports ToS (or Diffserv), to give higher priority to
Vmux-2100 IP traffic for delay-sensitive applications.
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Assigned, IANA-registered UDP socket
number for TDMoIP simplifies flow classification through
switches and routers.
MANAGEMENT
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All operating parameters of the
Vmux-2100 are configured using a simple, menu-based
software. For upgrades or backup, software upload and
download can be performed via TFTP.
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Vmux-2100 can be configured and
monitored via a local ASCII terminal, Telnet, or via RADview,
RAD's Network Management system. Vmux-2100 has a DB-9
Control port for the local terminal connection used for
monitoring and control. For off-site management, a terminal
can also be connected via a modem extension to the Control
port using the optional CBL-VMUX-MM-MODEM cable.
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Since Vmux-2100's internal control
unit has its own IP address, the Ethernet port can also be
conveniently utilized as a connection to management systems
running over Ethernet networks. Management connected to the
Ethernet port can even serve a remote unit that is connected
via an E1/T1 link, by placing the management information in
a dedicated timeslot of the TDM link (in-band management).
See Figure 4.
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For system security, Vmux-2100
provides four different levels for users: Monitor,
Technician, Operator and Administrator. Up to 20 different
usernames with passwords can be defined.
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