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COMT 220 2
Definition of “Switched Definition of “Switched Services”Services”
In a switched service at least some portion of the call path is
set up for the duration of the call only.
Everything else is a “Dedicated” or Everything else is a “Dedicated” or “Private” Service“Private” Service
COMT 220 3
Segments of an InterLATA Segments of an InterLATA ServiceService
OriginationOrigination
TerminationTermination
LocalLoop
IXC
LocalLoop
iLEC or cLEC
Access
Access
COMT 220 4
Some ExamplesSome Examples
CPE CPE
A Regular Long-Distance Call
DedicatedSwitched
CPE CPE
“WATS” Service
CO POP
COMT 220 5
Inbound Service (“800”)Inbound Service (“800”)
CPE CPE
Low-Volume 800 Service via Business Lines
DedicatedSwitched
CPE CPE
Typical Call Center
COMT 220 6
Special ServicesSpecial Services
CPE CPE
Foreign Exchange Service
DedicatedSwitched
CPE CPE
Private Lines
COMT 220 7
Switched Access DetailsSwitched Access Details
OriginationOrigination
IXC POPIXC POP
COCO
Dedicated Local LoopMonthly Charge
Per-Call Connection
Usage-Based Access Charge Usage-Charge
by IXC
Database Services
COMT 220 8
““Special” (Dedicated) AccessSpecial” (Dedicated) Access
OriginationOrigination
IXC POPIXC POP
COCO
Dedicated Local LoopMonthly Charge
Dedicated Connection
Monthly Access Charge
Usage-Chargeby IXC
Database Services
COMT 220 9
Types of ServicesTypes of Services
“Dial-1” Long Distance Service– Switched Access, on-demand– Highest per-call cost.
“WATS” (Wide Area Telephone Service)– Switched or Dedicated Access– Contractual Arrangements, Volume Discounts,
Minimum Commitments– Multiple services for different market segments
COMT 220 10
Types of Services cont…Types of Services cont…
“800” & “888” Services– Switched or Dedicated Access– Switched Access uses standard business line– Usually toll-free to the caller
“900” Information Services– Caller pays for information via telephone bill
Note: Other “X00” codes are in use
COMT 220 11
VPNsVPNs
Virtual Network Services– Switched and Dedicated Access– Multi-location service– Company-specific dialing plans– Call re-routing– Specialized announcements and intercepts– Offered through resellers to smaller businesses
COMT 220 14
V&H Distance ComputationV&H Distance Computation
Athens (V1,H1) = (6011,2354) San Francisco (V2,H2) = (8492,8719)
(V2 - V1) (H2 - H1)2 2+10Dist. =
Distance will come out in miles; must be rounded up
COMT 220 15
V&H Distance ComputationV&H Distance Computation
Athens (V1,H1) = (6011,2354) San Francisco (V2,H2) = (8492,8719)
(8492-6011) (8719-2354)2 2+10Dist. =
Result: 2161 miles
COMT 220 17
ExampleExample
Point of Origin at (5972, 2555)Destination of Call at (7070,2025)
Distance = (7070 - 5972) + (2025 - 2555)
2 2
10
= 386 miles
COMT 220 18
Special Access PricingSpecial Access PricingLEC ChargesLEC Charges
CustomerPremise
POP
CO
CO
LocalDistribution
Channel
LocalDistribution
Channel
Channel MileageChannel Mileage
(2) Channel MileageTerminations
(2) Channel MileageTerminations
COMT 220 19
Special Access PricingSpecial Access PricingIXC ChargesIXC Charges
CustomerPremise
POP
CO
CO
LocalDistribution
Channel
Channel Mileage
(2) Channel MileageTerminations
Access CoordinationCentral Office Connection
Access CoordinationCentral Office Connection
COMT 220 20
Private Line PricingPrivate Line Pricing
POP
CustomerPremise
POP
CustomerPremise
Special Accessto Nearest POP
Special Accessto Nearest POP
Special Accessto Nearest POP
Special Accessto Nearest POP
InterOffice ChannelMileage
InterOffice ChannelMileage