Tdm Sap-To-Sap Service; Cpipe Service Modes - Alcatel-Lucent 7705 Service Manual

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.
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).

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).
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.
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.
7705 SAR OS Services Guide
VLL Services
Page 141