2.17.1. General 
With the resource management for the features HFA (without the feature
HFA Mobile) and IPDA and DMC there are two different methods of resource
administering, observing and evaluating:
- The available bandwidth in certain sectors of a network and the exploitation by connections and
- the (DSP) channels of the gateways.
The resource Manager (RM) exists in every OpenScape 4000 system since
V2.0 up to the latest release and is always active. For the calculation
of the bandwidth required, the RM has to have knowledge of the current
topology of the IP network. If the topology is not configured, then the
RM assumes that infinite bandwidth is available.
For what RM is necessary?
A kind of resource Management was already available in HiPath 4000
V1.0 for IPDA. The number of B channels, which are connected to the customer
IP net, can be limited for a HG 3570/3575 board. But this method, which
is still available, can not be used for all configurations.
- HFA phones in a company branch behind a WAN connection with limited bandwidth can only be controlled by the Resource Manager. SIP subscriber can be used as well. The configuration of SIP subscriber in the AMOs are identically to HFA subscribers.
- Several access points IP installed in one location, which are connected via a WAN with limited bandwidth to the Host (the path to the Host must be limited, not the calls between the access points).
The following concepts Sector and cluster are essential for the broader
understanding of the function.