Overview of Pseudowire
Pseudowires manage encapsulation, timing, order, and other operations in order to make it transparent to
users. The pseudowire tunnel acts as an unshared link or circuit of the emulated service.
How to Configure Pseudowire
The following sections describe how to configure pseudowire.
Structure-Agnostic TDM over Packet
Structure-Agnostic TDM over Packet (SAToP) encapsulates Time Division Multiplexing (TDM) bit-streams
as pseudowires over public switched networks. 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 Provider Edge (PE) chassis. For example, a T1 attachment circuit is treated the same way
for all delivery methods, including copper, multiplex in a T3 circuit, a virtual tributary of a SONET circuit,
or unstructured Circuit Emulation Service (CES).
In SAToP mode, the interface is considered as a continuous framed bit stream. The packetization of the stream
is done according to IETF RFC 4553. All signaling is carried out transparently as a part of a bit stream.
Configuring CEM for SAToP
This section provides information about how to configure CEM. CEM provides a bridge between a Time
Division Multiplexing (TDM) network and a packet network, MPLS. The chassis encapsulates the TDM data
in the MPLS packets and sends the data over a CEM pseudowire to the remote Provider Edge (PE) chassis.
CEM is supported only on Cisco NCS 4206 and Cisco NCS 4216.
The following sections describe how to configure CEM.
Configuring CEM Restriction
• Not all combinations of payload size and dejitter buffer size are supported. If you apply an incompatible
payload size or dejitter buffer size configuration, the chassis rejects it and reverts to the previous
configuration.
• The dummy-pattern command is not supported.
CEM interface does not support idle-cas parameter.
Note
Configuring CEM Group for SAToP for T1 Interfaces
The following section describes how to configure a CEM group for SAToP.
enable
configure terminal
controller t1 0/4/0
cem-group 0 unframed
end
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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Overview of Circuit Emulation
Overview of Pseudowire
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