5s
into an STS-1.
In order to attain some efficiency between mapping the TDM hierarchy signals into
an Ethernet frame, the recommended bandwidth granularity is 100 kbits/s. TDM multiplexing
of signals is also possible and a higher aggregated signal handed to the IWF
for transport; at the other end, an identical de-multiplexing will occur.
18 Provider Edge (PE) denotes the Carrier POP or CO.
Carrier Ethernet 81
TDM Access Line Service (TALS) TALS is almost identical to the T-Line service
except that it is a Multipoint-to-Point service, and one or more ends of the TDM service
handoff is to an external network (such as a PSTN, as shown in Figure 2.19). A common
example of such a service is when the Service Provider Ethernet network is an access
to an external network. As with T-Line service, it can be operated in similar modes and
should ensure that it maintains integrity of the signal on an end-to-end basis.
Customer-Operated CES In this type of CESoE, the IWF is actually owned and/or
provided by the customer and the customer only subscribes to a typical E-LINE service
from the Service Provider. Usually in such a scenario, the Service Provider is expected
to provide a stringent SLA with tighter definitions of parameters such as packet delay,
variation in packet delay, and packet loss, to accommodate the TDM service.
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