Alcatel-Lucent 7750 SR - Ethernet Backhaul for CDMA;GSM;UMTS Network Infrastructure; Figure 22: Ethernet Backhaul for CDMA;GSM;UMTS

Page 80 7750 SR OS Services Guide
Ethernet Backhaul for CDMA/GSM/UMTS Network Infrastructure
Figure 22: Ethernet backhaul for CDMA/GSM/UMTS
While the previous sections concentrated on the centralized case (1) shown in Figure 22, one of
the key value propositions for utilizing service routers in the mobile backhaul RAN aggregation is
derived from its seamless ability to migrate to Ethernet/MPLS-based RAN aggregation whenever
and wherever the service provider wants. The service provider can choose between any
combination of a fully distributed model where Ethernet is used all the way to the cell site or a hub
model where Ethernet is used to the hub site and a traditional leased line or microwave is used for
the last mile access to the cell site.
OSSG141
2G BTS
NodeB
Alcatel 5620 SAM
BSC,
MSC
BSC
ENET,
POS
ENET
ENET
TDM
Chan STM-n
ATM IMA
1) Centralized
L1 groomed to
MTSO IMA
termination.
No 2G TDM.
2) Distributed to Hub
Extend Ethernet transport
to hub site. Backhaul both
3G ATM PW and
2G TDM PW.
3) Fully Distributed
Extend Ethernet transport to cell site.
Backhaul both 3G and 2G.
77x0SR
77x0SR
MTSO
Hub
Cell
Site
TDM
Chan STM-n
ATM IMA
N x T1IMA
BTS
NodeB
BTS
NodeB
N x T1IMA
MLPPP
N x T1
TDM
N x T1IMA
MLPPP,
Ethernet
N x T1
TDM
ENET,
POS
TDM Grooming
(LEC)
TDM Grooming
(LEC)
Ethernet (MPLS)
Aggregation
Network
PDH MW/LL (L1)
or ENET
(MetroE, DSL, Cable,
Microwave
Eth
RNC