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Pseudowire Overview
In the 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.
Figure 5-1
Table 5-1
Maximum
Payload
960
Table 5-2
Maximum
Payload
1280
For instructions on how to configure SAToP, see
(SAToP).
Circuit Emulation Service over Packet-Switched Network
CESoPSN encapsulates structured (NxDS0) TDM signals as PWs over public switched networks
(PSNs). It complements similar work for structure-agnostic emulation of TDM bit streams, such as
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 due to the effects of loss
of packets in the PSN.
CESoPSN identifies framing and sends only the payload, which can either be channelized T1s within
DS3 or DS0s within T1. DS0s can be bundled to the same packet. The CESoPSN mode is based on IETF
RFC 5086.
CESoPSN supports channel-associated signaling (CAS) for E1 and T1 interfaces. CAS provides
signaling information within each DS0 channel as opposed to using a separate signaling channel. CAS
also referred to as in-band signaling or robbed bit signaling.
Cisco ME-3600X-24CX Series Switch Chassis Configuration Guide
5-2
Figure 5-1
shows the frame format in Unstructured SAToP mode.
Unstructured Mode Frame Format
Encapsulation header
CE Control (4Bytes)
RTP (optional 12B)
CEoP
Bytes 1-N
Payload
shows the payload and jitter limits for the T1 lines in the SAToP frame format.
Table 5-1
Maximum
Minimum
Jitter
Jitter
320
10
shows the payload and jitter limits for the E1 lines in the SAToP frame format.
Table 5-2
Maximum
Minimum
Jitter
Jitter
320
10
SAToP T1 Frame: Payload and Jitter Limits
Minimum
Maximum
Payload
Jitter
192
64
SAToP E1 Frame: Payload and Jitter Limits
Minimum
Maximum
Payload
Jitter
256
64
Configuring Structure-Agnostic TDM over Packet
Chapter 5
Configuring Pseudowire
Minimum
Jitter
2
Minimum
Jitter
2
OL-27620-01
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