Page 82 7750 SR OS Services Guide
Ethernet Evolution of CDMA Networks with IP Backhaul
For existing CDMA solutions customers using IP backhaul, the recommended solution for
Ethernet backhaul is the installation of an Ethernet Interface Unit (EIU) at the base station for the
fully distributed case. This EIU is based on the DMXplore product. It can terminate the existing
MLPPP interfaces and use static routing to deliver this traffic to the Ethernet network port. It can
also aggregate other Ethernet traffic at the cell site. There are no special requirements on the
EATN that cannot be met with the current 7450-ESS and 7750/7710-SR portfolio although its key
differentiators of high availability, fast restoration and stringent QoS are strong value propositions
in this application. In some cases, the EIU may aggregate third party base stations through circuit
emulation. In these cases, an aggregated circuit emulation capability on the service router in the
MSC is required. Therefore, a channelized OC-3 CES capability interoperable with DMXplore is
supported for a completely integrated solution.
Alternatively, hub aggregation can be achieved by deploying lower capacity service routers at the
hub locations. he same architecture used in the centralized scenario can be deployed at the hub
site. A 7710-SR service router fits well for hub aggregation terminating the MLPPP traffic and
routing the traffic over the Ethernet ports using IES or IP-VPN services. This can be deployed
through lower density CMAs with physical DS-1 links or higher density ASAP MDAs using
channelized DS-3/OC-3/OC-12 interfaces depending on the number of BTS sites to be aggregated
at the hub site.
In either scenario, the migration to Ethernet backhaul will be gradual. Ethernet backhaul is
supported concurrently with IP backhaul to allow a gradual migration. In this case, both IP
backhaul and Ethernet backhaul are supported concurrently on a converged 7750-MLS.
To Next Page
Loading...
