3.13.1. Feature Description 
In order to use the "OpenScape Cordless E Integration" feature, a
software-based "virtual Subscriber Line Cordless" (vSLC) connector
unit must be configured in the OpenScape 4000 SoftGate. As with the SLC24
line cards, the vSLC provides the option of generating up to 127 cordless
handsets. The vSLC operates as a virtual home SLC for all administered
subscribers. The visit SLCs together with the DECT base stations form
the location areas at the site.
The number of CMI subscribers in the OpenScape 4000 SoftGate can be
increased by adding on other vSLC applications. Up to six vSLC applications
with a maximum of 650 handsets (0.15 ERL per handset) can be configured
in a OpenScape 4000 SoftGate.
INFO:
Base stations cannot be connected to the vSLC at present.
Figure 141. OpenScape Cordless E integration
If subscribers are not in the location area of their home SLC (always
applies with vSLC), a data exchange must be performed between the home
and visit SLC in order to fulfill the mobility concept. A prolonging
connection is set up for this purpose.
Registering CMI subscribers
In the current OpenScape 4000 cordless systems, subscribers can only
be registered in the location area of their home CMI node. CMI subscribers
can be relocated following registration to another SLC within the CMI
network with the "Relocation" feature.
Until a base station with an IP interface is available, registration
of CMI subscribers for the vSLC must take place in another CMI node with
a real base station. Following successful registration, the subscriber
must then be relocated via the OpenScape 4000 Manager/Assistant to the
new virtual CMI node.
Special characteristics in connection with OpenScape Access/Branch
If a OpenScape Access SLC module is connected to a OpenScape 4000
SoftGate with vSLC, then the Access SLC module should only be operated
with visit functionality.
If OpenScape Access SLC modules are connected to a OpenScape 4000
SoftGate with vSLC, then the SLC modules operate with visit functionality
only. The vSLC in the OpenScape 4000 SoftGate handles administration
of all registered CMI subscribers.
This results in the following benefits:
- Fewer IP-based prolonging connections
- Fewer B channels are needed
- Reduced conversion delay between OpenScape 4000 SoftGate and the SLC module
Special characteristics in connection with OpenScape 4000 SoftGate and VMware
If a OpenScape 4000 SoftGate is operated in a VMware environment,
the customer has the option to operate his entire Cordless E V7 redundantly.
All cordless subscribers have to be configured on virtual SLCs in
the OpenScape 4000 SoftGate for this purpose. An additional base station
is also installed at every base station location within a radius of approx.
1 - 2m. This additional base station is connected to a different SLC,
which in turn must be connected to a different shelf (or also OpenScape
4000 system). The second base station is operated with reduced transmission
power in order to avoid excessive alternation between base stations.
IMPORTANT:
A project-specific release is absolutely mandatory
for the redundancy scenario described.
Figure 142. Cordless E redundancy scenario
This results in the following benefits:
- SLC / shelf failure does not mean subscriber failure
- OpenScape 4000 SoftGate redundancy via VMware
- Handsets maintain the same numbers and features despite any incidents