11.1.5. Allocating Access Points/OpenScape 4000 SoftGates to a Survivability
Unit 
Access points/OpenScape 4000 SoftGates are not directly allocated
to a survivability unit. Instead, they are allocated to an emergency
group. The group defines which access points/OpenScape 4000 SoftGates
are to be treated the same.
For example, it does not make sense to switch control of an individual
access point/OpenScape 4000 SoftGate without trunk access from the host
system to a survivability unit. It makes more sense to switch an entire
group in one go that also contains an access point/OpenScape 4000 SoftGate
with trunk access. Switchover regulations are defined per access point/OpenScape
4000 SoftGate and group.
By introducing the abstract emergency groups, you can control several
groups independently of a shared survivability unit.
The hierarchical assignment is simple:
- An access point/OpenScape 4000 SoftGate can belong to exactly one emergency
group.
- An emergency group can be controlled by exactly one survivability unit.
All combinations with 1 to 83 access points/OpenScape 4000 SoftGates in 1 to 83 emergency groups on 1 to 83 survivability units are possible. A single APE entity can control all 83 access points.There are two kinds of access points/OpenScape 4000 SoftGates, depending on the type of connection; these are “Direct Link” (APDL) and “Networked Link” (APNW). For details, see “IP Distributed Architecture”, Section 2.2, “Access Point”.IMPORTANT:
A survivability unit in an APNW access point/OpenScape 4000 SoftGate cannot control any APDL access points/OpenScape 4000 SoftGates. However, a survivability unit in an APDL access point/OpenScape 4000 SoftGate can control both APDL and APNW access points/OpenScape 4000 SoftGates.