User's Manual Part 1

Table Of Contents

The connection to other network constituents is not possible in fallback operation, the fol-

lowing services and features, however, are available locally:

n Group calls

n Individual calls (semi-duplex and duplex calls)

n Transmission of SDS and status messages

n Class 2 and class 3 air interface encryption (encrypted voice and data communica-

tion)

n Authentication (with respect to the base station)

n Priority calls, emergency calls, pre-emptive priority calls

n Queue, depending on the priority level of the call

n Rejection of a call from/to an unknown subscriber

n Rejection with the reason "busy" if the subscriber is already making a call or the pri-

ority of the incoming call is minor

n Configurable call time limit

n Inactivity timer (ending semi-duplex calls after the configured inactivity time has

expired)

Fallback operation is the emergency operating mode of base stations in networks with

centralized switching architecture. The operating mode is signaled to the mobile stations

and taken into account by them for the cell selection.

3.5.5

Stand-alone operation

The radio coverage of base stations with Switching Controller Function (SCF) in networks

with distributed switching architecture continues to be ensured if they lose the connection

to all other network constituents with SCF. In this case the base station switches to stand-

alone operation.

In stand-alone operation, the base station in its radio cell will perpetuate the Base Station

Function (BSF) as well as all the other local services and gateways (Application Gateway

(AGW) and/or Packet Data Gateway (PGW)). As opposed to fallback operation, in stand-

alone operation Call Detail Records (CDR) will still be generated.

Stand-alone operation is the emergency operating mode of base stations in networks with

distributed switching architecture. The operating mode is signaled to the mobile stations

and taken into account by them for the cell selection.Depending on the project require-

ments, the signaling can be switched off upon demand.

3.5.6

Redundant V

voltage supply

For the reliable voltage supply, DIB-R5 provides two redundancy options for V

voltage

supply to ensure operation of the base station at all times:

Redundant rectifier modules (Power Supply Module, PSM)

Redundant voltage supply feeds

Both redundancy options can be combined for the highest possible reliability.

Product description

Redundancy options> Redundant VAC voltage supply

DIB-R5 advanced

62 Operation Manual 90DIBR5advancedOM02 - 1.0