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Readying Data Networks for
Converged Services
Presented by:
Jaye Armstrong-CCIE
Director of Data Services
Readying Data Networks for
Converged Services
• Introduction
• Assessing and Qualities that effect
Converged Networks
• Network Tools that effect Converged
Networks
• Example Network
What is a Converged Network?
Communications
• A converged network is a network that
handles two or more different
applications such as Data, Voice, and
Video.
Convergence Requirements
• Any Successful Converged Solution starts with a
• Complete assessment of the current network for:
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Speed and Duplex Settings of Devices
Current network applications and their priorities
Current Network devices and software revisions
Future Projects
Major Areas of Influence to Successful
Deployment
• Every network should be mapped in detail
and thoroughly assessed for the following
factors:
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Duplex Settings
Bandwidth
Delay
Jitter
Loss
Duplex Settings
• Duplex is the ability to converse in both directions at
the same time.
• All Telephone and Server equipment should be
manually set to Full-duplex on the device and switch.
• All switch ports that will have different devices
plugged in should be left to auto negotiate.
Bandwidth
• Bandwidth is the number of bits per second that
can be transmitted across a medium.
• Point to Point links use the physical medium
speed or clock rate of the interface to determine
bandwidth.
• Frame-Relay links should use the CIR (Committed
Information Rate) of the link.
Delay
• Delay is experienced on every network from the time
the packet Is first sent and when it arrives at it’s
destination.
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Serialization Delay
Propagation Delay
Forwarding/processing delay
Queuing Delay
Shaping Delay
Network Delay
Codec Delay
Compression Delay
Jitter
• Jitter is the variation in the arrival rate of packets
that were sent in a uniform manner.
• Jitter is unavoidable but we can keep it to a point
where it does not impact the quality of the service.
• Jitter is in a direct relationship with Bandwidth
and Delay
Loss
• Packet loss can happen for many
reasons but is not a concern in
most modern networks.
Industry Standards for Delay, Loss,
and Jitter
• Packet Loss
- 1% or less can yield toll quality
- 3% or less can provide Business
communication quality
- greater than 3% may be acceptable
for voice
• Jitter
• Delay
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- 20ms or less for Toll Quality
- 80ms or less for Toll Quality
- 180ms or less for Business Quality
Network Tools that effect
Converged Networks
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QoS – Quality of Service Tools
COS – Class of Service Marking
Queuing
Traffic Shaping
Fragmentation
Classification and Marking Tools
• COS – Class of Service is the marking and classifying of
packets.
• Class of Service marking does no good if the devices are not
configured to handle the marked traffic.
• True CoS uses the CoS field of an 802.1p/Q packet or the
Layer 3 DSCP value in the packet.
• Other means of marking traffic is through Port numbers, IP
addresses, etc through configuring access lists to identify
the traffic.
Quality of Service Tools
• QoS – Quality of Service refers to the network
devices actually
• Giving the tagged traffic different service levels.
• QoS on Layer 2 - queuing
• QoS on Layer 3 – queuing, traffic shaping,
fragmentation
Bandwidth Tools
• Compression
– Header Compression
– Silence Suppression
• Codec Selection
– G729 – Most Compression loss in quality
– G711 – No Compression Best Quality
Example Network Topology
T1 Connected Remote Site
Campus Remote Site
Frame Relay Connected Remote Site
Data Servers and PCs
Data Servers and PCs
IP Phones
Avaya 8300
IP Phones
Data Servers and PCs
Avaya 8300
Voice 172.16.53.0 / 24
Voice 172.16.51.0 / 24
IP Phones Avaya 8300
Data 172.16.54.0 / 24
Data 172.16.52.0 / 24
Voice 172.16.55.0 /24
Frame Relay
DATA VLAN 1 (Existing)
Main Voice VLAN 172.16.50.0/24
Data Servers and PCs
AVAYA 8700
HQ
Data 172.16.56.0 / 24
Example Campus Site
Campus Remote Site
Data Servers and PCs
IP Phones
Avaya 8300
Voice 172.16.51.0 / 24
Data 172.16.52.0 / 24
Set switch to trust CoS from the
8700 and enable queues for
priority.
This switch is also a router.
The QoS values will have to be
mapped to DSCP values for
Layer 3 forwarding.
CoS Set on the Avaya 8300 and
IP Phones
Set switch to trust CoS from the
8700 and enable queues for
priority.
DATA VLAN 1 (Existing)
Main Voice VLAN 172.16.50.0/24
CoS Set on the Avaya 8700
Data Servers and PCs
AVAYA 8700
HQ
Example T1 Site
T1 Connected Remote Site
Data Servers and PCs
IP Phones
CoS Set on the
Avaya 8300 and
IP Phones
Avaya 8300
Voice 172.16.53.0 / 24
Data 172.16.54.0 / 24
Set Routers to map CoS values
to DSCP Values for Layer 3
Forwarding
Set switch to trust CoS from the
8300 and IP Phones and enable
queues for priority.
The VoIP Path will probably use
g729 codec to enable more
calls across T1 Line
Set switch to trust CoS from the
8700 and enable queues for
priority.
CoS Set on the
Avaya 8700
DATA VLAN 1 (Existing)
Main Voice VLAN 172.16.50.0/24
Data Servers and PCs
AVAYA 8700
HQ
Steps to Success
• Planning
– Make Sure all requirements are documented
– Document Current Network
– Review requirements
• Assess Network Before and After Configuration
– Use a good assessment tool that injects Voice Traffic
– Add QoS to network one step at a time and test!
– Test Every possible scenario before putting into
production
THANK YOU
• For Further Questions:
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Jaye Armstrong
Lantana Communications
Director of Data Services
817-606-3317
[email protected]