g., N ?— 64 kbit/s, T1, E1, T3, and E3) and SONET/
SDH services (STS-1, STS-3, STS-3c, STS-12, STS-12c, and European equivalents).
The MEF 3 specifications address the types of CES that can be offered over a Service
Provider??“enabled Carrier Ethernet network (using EVCs) and also the requirements
of these services. The specifications basically enable the support of traditional TDM
handoffs to customer??™s voice equipment.
NOTE Voice is by far the dominating application requiring underlying TDM circuitswitched
services.
The MEF 8 addresses the practical aspects of CES and provides precise instructions
for implementing interoperable CES equipment that will conform to the performance
requirements outlined for CES in ITU-T and the ANSI TDM standards. The ITU-T
recommendation Y.1413 is very similar to the MEF 8, except for MPLS networks, and
Figure 2.18 Circuit emulation over Ethernet (Source: MEF)
T-LINE: P2P TDM Connection b/w two Customer Premise locations
TALS: CES b/w Customer Premise and External Network (PSTN)
Customer Operated CES: IWF Owned and Operated by Customer
TSP/
CES IWF
TDM
CE
TSP/
CES IWF TDM
CE
TDM
CE
TDM
CE T3
T3
T1
T1
MEN
TSP/
CES IWF
TSP/
CES IWF
TSP/
CES IWF
OC3
Multiple Subscribers
Handed Off to
External Network
Point-to-Point EVCs
PSTN
TSP: TDM Service Processor (optional)
CES IWF: CES Inter Working Function
EVC: Ethernet Virtual Circuit
PSTN: Public Switched Telephone Network
TDM CE: TDM Customer Edge
Customer Premise
Customer Premise
Customer Premise
Customer Premise
Carrier Ethernet 79
employs identical frame formats for payload and encapsulation so that the equipment
supporting Y.
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