Master

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TDMoIP
CONCEPT TRENDS
Eitan Schwartz Vice President and General
Manager, TDMoIP Technologies RAD Data
Communications Inc. Email eitan_at_radusa.com Ph
201-529-1100 x 241 Web http//www.rad.com Fax
201-529-5777
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Contents

• Trends
• The opportunity and problem
• Solution Circuit Extension over IP
• TDMoIP architecture and RADs Implementation
• Comparing TDMoIP with ATM and VoIP
• Benefits of TDMoIP
• Service Provider Solutions
• Enterprise Solutions
• Summary

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Packet over TDM

• Today, Voice and data traffic traverse the TDM,
  circuit switched network

IP, FR, ATM carried across PSTN, T1, T3 and
SONET Highways
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Trend TDM Voice Data over Packet

• Tomorrow, TDM based voice and data will be
  carried across packet networks

Cable
DWDM

• Because IP services are
• Fast (GbE rates)
• Cheap (low /Mbps)
• Reliable (QoS)
• Scalable (up to 10Gbps)
• Ubiquitous

Wireless
Gigabit Ethernet
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Trends

• Carriers installing more IP and Gigabit Ethernet
• Packet-based networks are scalable and cost less
  than traditional T1 and T3 leased lines
• Powerful Ethernet switches are dominating the
  enterprise because they are cheap and simple
• Enterprises consider migrating their legacy voice
  networks over IP, but are concerned that voice
  quality, service reliability and existing
  features may be compromised
• Service providers are looking to provide
  additional services over cost-effective IP
• Simple, low cost solutions continue to beat
  complex, expensive alternatives

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The Opportunity and Problem

• Opportunity
• Convergence of voice and data reduces redundant
  administration, cabling and hardware costs
• Problem
• Connecting PBXs and TDM equipment over IP is
  problematic due to signaling, timing and
  specialized features
• Most solutions are complex and expensive they
  usually compromise quality and functionality

Feature transparency is often compromised
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Solution TDMoIP GatewaysCircuit Extension over
IP

• Transparent extension of T1/E1 circuits over IP
• The synchronous bit stream is chopped into
  packets
• IP headers are added
• Packets are forwarded to destination over the IP
  network
• At destination, the original bit stream is
  reconstructed by removing IP headers,
  concatenating the packets, and regenerating the
  clock
• This technology is called TDMoIP

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Reversing the Approach
Reverse approach over IP
Classic approach IP over...
IP
TDM
IP
ATM/FR
TDM/SONET
Ethernet
Fiber
Fiber
So now TDM simply becomes the legacy migration
application running over an IP infrastructure
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TDMoIP ArchitectureCircuit Extension over IP
User Interface Standards based (e.g.T1,
E1) Unframed or framed/channelized Transparent to
protocol - Any data (BSC, FR,..) - Any voice
(PCM, ADPCM,..) - Any signaling (PRI, DPNSS,
SS7,..)

• Network Interface
• Low cost (e.g. 10/100BaseT)
• Configurable QoS options
• - VLAN for layer 2 priority (802.1pq)
• ToS for IP level priority
• known UDP Ports for layer 4 priority
• Compensate packet delay variation

Traditional Circuits
Packet Networks
TDMoIP
External / adaptive clock regeneration Low
processing delay Scalability, redundancy,
management diagnostics
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IPmux Family
IPmux-1
IPmux-16
IPmux-4
Back Panel

• 1, 4 or 16 T1/E1 ports over Ethernet uplink
• TDM payload configurable from 48 to 384 octets
• Overhead as low as 7
• Low processing delay (under 1ms)
• QoS support for 802.1pq, ToS IANA UDP ports
• SNMP management with graphic interface
• Performance monitoring for T1/E1 and LAN ports

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TDMoIP Architecture Challenge
IPMux
Architecture

• Standard Framed Unframed E1/T1 supported

Standard Interface supports full and Fractional
services

• 10/100BaseT Ethernet

High speed, low cost network interface

• Physical layer extension over IP

Transparent to Protocol

• Supports 802.1pq (layer2), IP ToS (layer3)
  IANA UDP ports (layer 4)

Complete support for QoS facilities

• Low processing delay (under 1ms).

Low delay

• Jitter buffer compensates for up to 32ms delay
  variation (300ms on IPmux-1)

Support packet delay variation

• Clock recovered through network

Support for cross network clock regeneration

• Scalable through Ethernet switch

Easily scalable

• Redundant power supply and uplink

High availability
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Price Comparison IP vs. TDM
/Mbps
T1, T3 circuit costs
Conclusion Price of IP bandwidth decreasing at a
much faster rate than that of T1 or T3
T1/T3 circuit costsusing IPmux
IP costs
time
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TDMoIP vs. ATM

• TDMoIP provides similar benefits to ATM
• low end-to-end delay
• maintaining integrity of framed or unframed T1/E1
• In contrast to ATM, TDMoIP
• is simpler and less expensive
• has configurable packet size for optimizing
  overhead/delay trade off
• is carried over ubiquitous IP and Ethernet
  networks

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TDMoIP vs. VoIP

• TDMoIP and VoIP both offer convergence over IP
• In contrast to VoIP, TDMoIP
• is transparent to protocols and signaling
• is simpler and less expensive
• supports installed PBXs with no loss of
  functionality
• supports all modem and fax rates
• is suitable for sync/async data protocols
• maintains integrity of framed and unframed T1/E1
  circuits

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TDMoIP and VoIP
Have same goals - convergence, ...but a
few critical differences

• TDMoIP (Telephony over IP)
• Simple evolutionary
• uses standard, mature, and well known protocols
  T1, IP
• low cost of ownership
• Maintain installed PBXs
• significant cost savings
• little disruption to business
• No loss of PBX functionality
• Low delay
• transparent to signaling and protocols
• Configurable packet size
• low delay
• configurable overhead
• Data voice circuit extension
• DS0 level bundling X-connect

• VoIP (IP Telephony)
• Complex revolutionary
• new evolving protocols such as H.323, MGCP, and
  SIP
• complexity requires retraining IT
• Fork lift upgrade (reinvent the telephone switch)
• compatibility issues
• Limited today, new features possible
• Long call setup times
• translation between signaling formats (SS7,
  ISDN,..)
• Packets depend on codec samples
• delays as sample is recorded
• overhead on each voice session
• Primarily voice
• Voice switching per call

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Alternatives for Migrating Legacy PBXs to IP
Networks
VoIP
TDMoIP
The alternative for customers who have fully
depreciated their telephony equipment
An inexpensive migration strategy to IP

• If youre happy with your telephony features,
  but you wish to migrate to IP networking without
  fork lift upgrades and lost functionality

• If current telephony features are insufficient
  and youre ready to take on the challenges of new
  and evolving protocols

Simple, Low cost of ownership
Complex, Expensive
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Benefits for End-Users and Integrators

• End User
• Simple, low cost voice/data convergence solution
  over IP and Ethernet
• Protect investments in PBX and TDM equipment with
  no fork lift upgrades and no loss of
  functionality
• Integrators
• Tie the circuit switched world into the IP
  economy
• Help build reliable enterprise and institutional
  networks
• Address enterprise business concerns by providing
  evolutionary rather than revolutionary solutions

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Benefits for Vendors Complimentary Solutions

• PBX vendors
• PBXs with proprietary signaling and unique
  feature sets are now fully supported over IP
• Ethernet switch and router vendors
• Now are empowered with traditional TDM voice,
  video data capabilities
• Wireless radio and laser equipment vendors
• Systems designed for LAN extension can now
  deliver leased line services to remote buildings

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Benefits for Competitive Carriers

• Compete with ILEC by providing voice and leased
  line services over Ethernet or IP infrastructure
• Expand market share quickly into tier 4 towns
  with scalable solution that reduces risk
• Efficiently groom T1/E1 circuits onto optical
  and wireless networks (DS0 granularity)
• Provide access to ATM, Frame Relay, ISDN and X.25
  over IP networks

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Circuit Extension over IP -Generic Carrier
Application
Enhanced Services
Customers
Basic Transport
IPmux
n x T1/E1 Circuits extended to customers
3rd party service offerings
Multi-tenant Unit (MTU)
IPmux
PSTN Centrex Clearinghouse VoIP ATM Frame
Relay etc.
IPmux
m x T1/E1
n x T1/E1 Circuits extended to customers
Service POP
Regional POP
KEY
TDM Synchronous link (e.g T1)

• Gigabit Ethernet Switch
• Wireless Ethernet Modem
• IP Router
• DSLAM

Packet (e.g 10/100BaseT)
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Service Provider Solutions

• Circuit Extension over IP - Generic carrier
  application
• Wireless and optical local loop
• Voice and data services to multi-tenant buildings
• Expand market Share using ILEC for local loop
• Connecting cellular networks over IP
• Grooming DS0 channels onto T1/E1 and Ethernet
• Bundled services PSTN, VoIP and Internet

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Circuit Extension over IP -Generic Enterprise
Application
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Enterprise Applications

• Circuit Extension over IP - Generic application
• Centralized Voice Services
• Voice and Video across Campus LAN
• Metro Area networks Adding Voice to Optical
  Packet Networks
• Building a Wireless Campus Voice and Data
  integration over Ethernet
• Adding Voice to Wireless LAN Networks
• Drop-and-Insert over Fiber (Max 500 T1)
• Adding Voice to LAN over ATM Networks
• PSTN Bypass
• Secure Government / Military Networking over IP
• Legacy TDM Multiplexing over IP - Generic
  Application
• Extending Analog or ISDN Telephones over Ethernet
  or IP networks
• Channelized T3/E3 High-Speed Serial Data over
  Ethernet or IP
• SCADA System Control and Data Acquisition

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Summary

• Simple, inexpensive migration path to IP without
  compromising current telephony features
• Transparent to all signaling and protocols
• Protects investment in PBX and TDM equipment with
  no fork lift upgrades Circuit Extension over IP
  provides the benefits of IP networks without the
  dangers of a new technology
• Supports legacy telephony services over IP with
  no loss of functionality
• Empowers IP networks with leased line
  capabilities for Voice, ATM, Frame Relay, SNA,
  etc.