ATM VLL (Apipe) Services
Page 138 7705 SAR OS Services Guide
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ATM SAP-to-SAP Service
ATM VLLs can be configured with both endpoints (SAPs) on the same 7705 SAR. This is
referred to as ATM SAP-to-SAP or local ATM service. ATM SAP-to-SAP emulates local
ATM switching between two ATM endpoints on the 7705 SAR. Both ingress and egress
traffic is legacy ATM traffic.
An ATM SAP-to-SAP connection is set up in the 7705 SAR and a pseudowire is configured
between the two endpoints. One endpoint of the SAP connection can be an IMA group,
while the other endpoint can be an unbundled port.
Figure 19: ATM VLL for End-to-End ATM Service
19482
BSC
RNC
BTS
Node B
TDM
TDM PW
ATM PW
Ethernet PW
ATM
Ethernet
77x0 SR
Ethernet
MPLS LSP
Cell Site
Owned by Mobile Operator
MTSO
Owned by Mobile Operator
Ethernet
TDM
ATM
GigE
Telemetry,
site surveillance
7705 SAR
Metro
Ethernet
Note: ATM SAP-to-SAP connections are supported between any T1/E1 ASAP port that is in
access mode with ATM/IMA encapsulation and another port with the same encapsulation
configuration. One endpoint of a SAP connection can be an IMA group, while the other
endpoint can be on a single ATM port.
ATM SAP-to-SAP connections are also supported between any two OC3/STM1 ports and
between any T1/E1 ASAP port and OC3/STM1 port, as long as both SAPs support ATM.
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