Alcatel-Lucent 7750 SR OS - Figure 12: SC-APS MLPPP on Channelized Access Interfaces Example

Ports
Page 84 7750 SR OS Interface Configuration Guide
Sample APS Applications
The following sections provide sample APS application examples.
Sample APS Application:
MLPPP with SC-APS and MC-APS on Channelized Interfaces
7750 and 7710 service routers support APS on channelized interfaces. This allows Alcatel-
Lucent’s service routers to be deployed as the radio access network (RAN) aggregation router
which connects the base transceiver station (BTS) and the radio network controller (RNC).
Figure 12 displays an example of MLPPP termination on APS protected channelized OC-n/STM-
n links. This example illustrates the following:
• SC-APS (the APS circuits terminate on the same node Aggregation Router A)
• APS protecting MLPPP bundles (bundles are between the BTS and Aggregation Router
A, but APS operates on the Sonet links between the DACS and the Aggregation Router)
• APS on channelized access interfaces (OC-3/OC-12 links)
Figure 12: SC-APS MLPPP on Channelized Access Interfaces Example
Figure 13 depicts an APS group between a digital access cross-connect system (DACS) and a pair
of Aggregation Routers. At one end of the APS group both circuits (OC-3/STM-1 and/or OC-12/
STM-4 links) are terminated on the DACS and at the other end each circuit is terminated on a
OSSG142
GigE
GigE
GigE
GigE
MLS B
MLS A
GigE
GigE
EV-DO
BTS
DACS
T1 # 2
Aggregation
Router A
Switch
B
AP
TP
TP
AP
TP
TP
Switch
A
BITS I/F
RAN Data VLAN
Hand-off Network VLAN
PDSN, AAA VLAN
OAM VLAN
DHCP Relay
T3/OC-3/OC-12
T1 # 1
PRS
OAM PDSN, AAA
Hand-off Network