VLL Services
7705 SAR OS Services Guide Page 141
TDM SAP-to-SAP Service
TDM VLLs can be configured with both endpoints (SAPs) on the same 7705 SAR. This is
referred to as TDM SAP-to-SAP or local TDM service. TDM SAP-to-SAP emulates a TDM
multiplexing and switching function on the 7705 SAR.
A TDM SAP-to-SAP connection is set up in the 7705 SAR and a pseudowire is configured
between the two endpoints.
Cpipe Service Modes
Cpipe services support unstructured circuit emulation mode (SAToP) as per RFC 4553 and
structured circuit emulation mode (CESoPSN) for DS1, E1 and n × 64 kb/s circuits as per
RFC 5086.
Unstructured Mode (SAToP)
Structure-agnostic TDM over Packet (SAToP) is an unstructured circuit emulation mode
used for the transport of unstructured TDM or structured TDM (where the structure is
ignored).
As a structure-unaware or structure-independent service, SAToP service does not align to
any framing; the framing mode for the port is set to unframed. For structured TDM, SAToP
disregards the bit sequence and TDM structure in order to transport the entire signal over a
PSN as a pseudowire.
Note: TDM SAP-to-SAP connections are supported between any T1/E1 port or channel that
is configured for access mode and circuit emulation service and another port or channel with
the same configuration (endpoint type, bit rate [number of DS0s in a channel group], payload
size, CAS enabled/disabled, and RTP enabled/disabled).
Note: The word “agnostic” is used in RFC 4553, but it is not used in the literal sense. The
meaning of agnostic in this case is “unaware or independent”; therefore, structure-agnostic is
used to mean structure-unaware or structure-independent.
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