Cisco 3825 - Manual (Page 26)

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router
New Features in Cisco IOS Release 12.4(16)MR1
The following example illustrates the use of the idle-pattern command:
interface CEM0/0/0
no ip address
cem 0
idle-pattern 0x55
xconnect 10.10.10.10 200 encapsulation mpls
A new command shutdown has been added to this feature to administratively shut down the CEM
channel.
Default: cem channel is created in a “no shut” state.
The following example illustrates the use of the shutdown command:
interface CEM0/0/0
no ip address
cem 0
shutdown
xconnect 10.10.10.10 200 encapsulation mpls
A new command class cem has been added to this feature to allow CEM interface parameters to be
configured in a class and applied to CEM interfaces together. This command works in the same manner
for CEM interfaces as the pseudowire-class command does for xconnect.
The following example illustrates the use of the class cem command:
class cem mycemclass
dejitter-buffer 10
sample-rate 2
interface CEM0/0/0
no ip address
cem 0
xconnect 10.10.10.10 200 encapsulation mpls
cem class mycemclass
Structure-agnostic TDM over Packet (SAToP)
SAToP encapsulates TDM bit-streams (T1, E1, T3, E3) as PWs over PSNs. It disregards any structure
that may be imposed on streams, in particular the structure imposed by the standard TDM framing.
The protocol used for emulation of these services does not depend on the method in which attachment
circuits are delivered to the PEs. For example, a T1 attachment circuit is treated in the same way
regardless of whether it is delivered to the PE on copper, multiplexed in a T3 circuit, mapped into a
virtual tributary of a SONET/SDH circuit, or carried over an ATM network using unstructured ATM
circuit emulation service (CES) [ATM-CES]. Termination of any specific “carrier layers” used between
the PE and CEM is performed by an appropriate network service provider (NSP).
Structure-aware TDM CESoPSN
CESoPSN encapsulates structured (NxDS0) TDM signals as PWs over PSNs. It complements similar
work for structure-agnostic emulation of TDM bit-streams, such as PWE3-SAToP.
Emulation of NxDS0 circuits saves PSN bandwidth and supports DS0-level grooming and distributed
cross-connect applications. It also enhances resilience of CE devices to the effects of loss of packets in
the PSN.