There are two alternatives for the introduction of this solution. The existing TDM network can be extended with SURPASS hiE Converged Access to provide additional subscriber ports already based on NGN technology. New interfaces like ISDN PRI, V5.x or xDSL can be offered to the subscribers opening new revenue streams. Existing EWSD switches can smoothly be migrated to SURPASS hiE Converged Access for maximum investment protection. The IP Converged Access Solution provides all interfaces and features and consolidates your network..
No changes at the access equipment is necessary. Also the existing SS7 signaling remain the same. The upgrade is guarded by a powerful Number Portability feature. New features like Prepaid Card and Centrex are available.
The SPC sharing can also be used to migrate a TDM network stepwise to NGN. The example shows this for EWSD, however it can work with any TDM switch as well. In step 1 the SS7 must be switched over that all messages to the EWSD switch are routed via the SURPASS hiE 9200. As the CIC are still unknown by the SURPASS hiE 9200 it will forward all messages to the EWSD switch. In step 2 the trunk and access part of the EWSD switch can be migrated to NGN in small steps, e.g. DLU per DLU and trunk by trunk. It is not necessary to switch over in one single night, which minimizes the risk of outages. In the final step 3 all access and trunk interfaces have been migrated and the core of the EWSD switch can be switched off from the network. Advantages: Small step migration minimizes risk of total outage. Existing SS7 network is minimal affected, no changes in SS7 routing in other parts of the network.
Network Consolidation continues by migrating additional EWSD local exchanges. All DLU‘s can be reused. Native subscribers are handled via a separate SIP application server.
You can reuse the installed HW and connect all kind of existing Access equipment to this solution. => But one very useful and cost saving feature is, that you can reconfigure trunks to subscriber ports just by database change. This is necessary because: In the beginning of a migration you need a lot of trunks to the TDM world. After the migration a big number of calls will stay in the NGN network and you will need less trunks. Than you can simply reconfigure unused trunks to subscriber port interfaces like V.93, V5.2 or ISDN PRI.
After this migration you can connect legacy subscribers via new DLUIP or RSDLUIP. You also can connect Multi Service Access via rack integrated IP-DSLAM‘s with a common Ethernet uplink. After migrating other local switches to the IP network the breakout to the transit network can be reduced.
A new hiE 9200 is placed next to the old switch. The SS7 signaling has to be reconfigured to the new hiE with the same Signaling Point Code (and Own Point Code). Unknown requests are forwarded to the old TDM switch. A stepwise migration to the SURPASS hiE 9200 is now possible. All kind of network features like charging, IN, Announcements are supported by the new hiE.
A trunk Gateway for the PSTN breakout is necessary before Access Gateways can be configured. Line by line and Access Gateway by Access Gateway can be migrated to the SURPASS hiE 9200. There are no changes in the existing V5.x access equipment necessary and also the existing SS7 routing tables can remain unchanged. The hiG 1600 Access Gateway supports all class 5 subscriber features like CLIP, Call Waiting, Closed User Group and all classic TDM interfaces like POTS, ISDN BRI, ISDN PRI, V5.x and even SS7 trunks.
Now you can connect legacy subscribers to your new NGN network. Network Consolidation continues by migrating additional local exchanges. Native IP subscribers are handled via a separate SIP application server.
