g., PSTN)
Ethernet UNI Ethernet UNI
Ethernet UNI Ethernet UNI
TDM
CES IWF CES IWF
TDM Subscriber Demarcation TDM Network Interface Service Provider Network
Service Provider Network
Customer
Premises
Customer
Premises
Customer
Premises
Metro Ethernet Network
??? Customer-Operated CES:
??“ Application: Toll-bypass
CESoETH
Ethernet UNI and Subscriber
Demarcation
Ethernet UNI and Subscriber
Demarcation
Ethernet
E-Line Service
E-Line Service
E-Line Service
Ethernet
Ethernet Ethernet
Ethernet
TDM TDM
CES IWF CES IWF
Service Provider Network
CESoETH
TDM
Ethernet TDM
80 Chapter 2
The TSP and the CES IWF may physically reside in the Provider Edge (PE)18 unit
at the provider??™s nearest Point-Of-Presence or in a Service Provider??“owned box in a
customer location (e.g., a multi-tenant unit). From the architectural perspective, there
is no difference between these alternatives.
TDM Line Service (T-Line) The basic TDM Line (T-Line) service is a Point-to-Point,
constant bit rate service, similar to the traditional leased-line type of TDM service.
However, service multiplexing may occur ahead of the CES inter-working functions,
(e.
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