Transcript Carrier Network Services

Broadband and Wide Area
Network Services
Carrier Gigabit Ethernet
Multi Protocol Label Switching Vs. IP
VPNs
T-1 & T-3
SIP Trunks
Security
Network Topology
Backup Services
Managed Services
Carrier Network Services
Remote worker
Branch office
Branch office
Internet
Your home
PSTN
(Public switched
telephone network)
Headquarters
Connections to Carriers’ Networks
Legacy TDM
Voice network
Carrier DACS
Customer Premise
! " #$%&'
Switch
Internet
TDM Voice PBX
Connections to Carriers’ Networks
VoIP to customer network
Customer Premise
Carrier IP
Voice/Data network
! " #$%&'
Switch
Customer IP PBX
Carrier Gigabit Ethernet
 Site to site links in metro areas
 Internet access
 Flexibility
 Speeds
 Scalable capacity
 Fiber
 Same protocol as LANs
 Over copper
 Slower speeds
 Not available everywhere
 Not suitable for traditional voice
Overview of an MPLS Network
High-speed
core routers
MPLS Network
Edge routers attach labels
to customers’ packets
• Edge routers connected directly to
customers
• core routers connected only to other routers
Access Lines provide service connections
(TDM =T1, T3, SONET; IP = DSL, Ethernet)
and the
Can be on same
circuit to carrier’s
network
Internet
Access lines
Customer premises
router
LAN switch
VoIP phone
IP VPNs – Using the Public Internet
• Sending traffic over the public Internet
– Encrypted
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Cost savings
Site to site
Telecommuters
Remote salespeople
Secure Remote Access to MPLS or IP VPNs
Secure tunnel
over broadband,
Internet, & MPLS
Internet
Secure tunnel
over high-speed
access line
MPLS NETWORK
Telecommuter
Headquarters' LAN
Telecommuter’s laptop and headquarters
have matching security tunneling protocols
surrounding data.
T-1/T-3 Time Division Multiplexing
What are the pros and cons of T-1/T-3 service?
Each device
assigned a time slot
1
24 or 32 channels
T-1 Mux
2
3
4……..24
24 or 32channels
T-1 Mux
T-1 - Fiber, copper or wireless, 24 channels
E-1 - Fiber, copper or wireless, 32channels
T-3 – Fiber or wireless; 672 channels
E-3 – Fiber or wireless: 480 channels
Session Initiation Protocol (SIP)
Trunking
• A standardized signaling protocol in IP networks
– Used to connect carriers to each other
– Connects enterprise VoIP PBXs to carrier’s circuits
• Used on the Internet
• In VoIP PBXs
– Trunks connected to the Internet
– Combine VoIP and data
• Different implementations by PBX manufacturers
and carriers
How do we Choose Carrier Services?
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Each group should explain the service assigned to their group by answering the
questions below.
– T-1 - Group 1
– T3 – Group 2
– Carrier Gigabit Ethernet – Groups 3 and 4
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Let us know the size of organization that would use it (small, medium, large)
For your service let us know:
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Its speed
Multiplexers or switch needed to support it
Ability to increase capacity (scale)
Ability to shrink capacity if the company decreases in size
Does it support voice, data, and video?
Media it operates on
Disadvantages of this service
Hub and Spoke Topology
Gigabit Ethernet
Seattle
Internet
Los Angeles
Wide area network
Centralized applications
at headquarters
T-1 at smaller sites
Houston
Miami
Outside Cable Reliability
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What can go wrong in broadband links?
Back-up plans in the event of cable cuts or other carrier outages:
• What are affordable options for small
organizations?
WiMAX tower
PSTN
Cell tower
Internet
Verizon equipment
AT&T equipment
Carriers’ Managed Services
For a fee (naturally) carriers will manage:
Routers
T-1/T-3 multiplexers
Ethernet switches
The data center
Security
Remote access
MPLS
Quality of service
Latency
Wireless devices
Call center consulting
Back-up
Staffing productivity
Summary
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T-1/E1
T3/E3
Gigabit Ethernet
MPLS
IP VPNs
SIP trunking
Vulnerability to cable cuts and other outages
Security
Topology
Managed services