Broadband and Wide Area Network Services

Carrier Gigabit EthernetMulti Protocol Label Switching Vs. IP

VPNsT-1 & T-3

SIP TrunksSecurity

Network TopologyBackup Services

Managed Services

Carrier Network Services

Branch office

(Public switched telephone network)

Your home

Remote worker

Branch office

Headquarters

Connections to Carriers’ NetworksLegacy TDM

TDM Voice PBX

Internet

Voice network Customer Premise

SwitchCarrier DACS

Connections to Carriers’ NetworksVoIP to customer network

Customer IP PBX

Carrier IP Voice/Data network

Customer Premise

Switch

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

Edge routers attach labels to customers’ packets

MPLS Network

High-speed core routers

• Edge routers connected directly to customers

• core routers connected only to other routers

Los Angeles

New OrleansMIAMI

Access Lines provide service connections (TDM =T1, T3, SONET; IP = DSL, Ethernet)

and the

MPLS Network

LAN switch

router Customer premises

Access lines

VoIP phone

Can be on same circuit to carrier’s network

IP VPNs – Using the Public Internet

• Sending traffic over the public Internet– Encrypted

• Cost savings• Site to site• Telecommuters• Remote salespeople

Secure Remote Access to MPLS or IP VPNs

Telecommuter

MPLS NETWORK

Headquarters' LAN

Secure tunnel over high-speed access line

Telecommuter’s laptop and headquarters have matching security tunneling protocols surrounding data.

Secure tunnel over broadband, Internet, & MPLS

T-1/T-3 Time Division Multiplexing

24 or 32 channels 24 or 32channels

T-1 - Fiber, copper or wireless, 24 channelsE-1 - Fiber, copper or wireless, 32channelsT-3 – Fiber or wireless; 672 channelsE-3 – Fiber or wireless: 480 channels

T-1 Mux T-1 Mux

1 2 3 4……..24Each device assigned a time slot

What are the pros and cons of T-1/T-3 service?

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?

• 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

• Let us know the size of organization that would use it (small, medium, large)• For your service let us know:

– 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

Wide area network

Miami

Houston

Los Angeles

Seattle

Gigabit Ethernet

T-1 at smaller sites

Centralized applications at headquarters

Hub and Spoke Topology

Outside Cable Reliability• 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?

AT&T equipment

Cell tower

Verizon equipment

WiMAX tower

Carriers’ Managed ServicesFor a fee (naturally) carriers will manage:

RoutersT-1/T-3 multiplexersEthernet switchesThe data centerSecurityRemote access

MPLSQuality of serviceLatency

Wireless devicesCall center consulting

Back-upStaffing productivity

Summary• T-1/E1• T3/E3• Gigabit Ethernet• MPLS• IP VPNs• SIP trunking• Vulnerability to cable cuts and other outages• Security• Topology• Managed services