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Low−Delay, Code−Excited Linear Prediction (LD−CELP) at 16Kbps•
Conjugate−Structured, Algebraic Code−Excited Linear Prediction (CS−ACELP) at 8Kbps•
The IGX voice interfaces also support the VAD silence suppression technique, which sends cells on the trunk
only when there is something to send. With most voice connections consisting of up to 60 percent silence,
VAD technology enables the IGX 8400 series to achieve an average two−to−one compression ratio, thus
saving additional bandwidth. When combined with ADPCM, LD−CELP, or CS−ACELP compression
schemes, VAD enables you to achieve compression ratios beyond eight to one.
In addition, the voice interfaces support fax and modem data transport. For Group 3 fax, the Universal Voice
Module supports Fax Relay, whereby it demodulates and remodulates the signal and transports a fax across
the network using only 9.6Kbps of network capacity.
The Catalyst 8400 series also supports voice switching capabilities using the Voice Network Switching (VNS)
system. VNS enables a Catalyst 8400 network to function as a tandem voice network that receives signaling,
interprets it, and dynamically establishes voice connections between the source and destination ports. The
network routes each voice channel on a per−call basis and extends advanced voice features (such as transfer,
caller ID, and camp−on) across the wide−area network. With VNS, available trunk capacity can be
dynamically used by bandwidth−hungry data applications, thus maximizing the efficiency of available
network resources. The network ensures an optimal connection for each call, reducing delay and improving
voice quality by minimizing compression cycles.
IGX 8400 series circuit data capabilities enable synchronous or asynchronous legacy data or video to be
transported across the WAN through a fixed−delay, fixed−throughput, zero discard, or point−to−point data
connection. Available speeds range from 1.2Kbps to T1/E1 for synchronous data and from 1.2Kbps to
19.2Kbps for asynchronous data using standard serial interfaces such as V.28/RS−232, V.11/X.21, V.35,
EIA/TIA−449, and T1/E1.
A network of Catalyst multiservice ATM switches can be deployed with a variety of trunk interfaces and
speeds ranging from 64Kbps to OC−3/STM−1.
Network Management
The Catalyst 8400 can be managed using the CiscoView GUI management tool or Cisco Strata View Plus for
integration with NetView or HP OpenView. The Strata View Plus software also provides management
applications using SNMP, application programming interfaces (APIs), and SQL−based API for database
inquiries.
Cisco Catalyst 8500 Series
The Catalyst 8500 series multiservice switch routers integrate multiservice ATM switching with wire−speed
multiprotocol routing and Layer 3 switching into a single platform that supports Cisco IOS services for QoS
and security. The Catalyst 8500 family delivers campus and metropolitan network solutions with scalable
performance and lower cost of ownership.
Large−scale deployment of server farms and the continued growth of intranet applications are driving the
substantial increase of traffic volumes in enterprise networks. The traffic volumes are coupled with shifts in
traffic patterns that do not conform to traditional network design principles such as the 80/20 rule. Common
applications for the Catalyst 8500 series switches include centralized server farms, transport of
mission−critical applications, and intranets.
The Catalyst 8500 series consists of the Catalyst 8510 and 8540, which are 5− and 13−slot modular
chassis−based implementations of the Catalyst 8500 technology. Table E.12 lists key features of the Catalyst
8500 series switches.
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