Specifications

Interface Protocols
Operating Characteristics
3-2 68P81095E55-E August 08, 2000
Interface Protocols
The iDEN system supports and uses several protocols and interface standards. These
include:
• Radio Link Protocol
• Motorola Implementation A-Bis interface
• Signalling System Seven
•X.25
•Ethernet
• Simple Network Management Protocol
• VSLEP
•Frame Relay
• Pulse Code Modulation
Radio Link Protocol
Radio Link Protocol (RLP) is the method of transferring compressed character data
between the MS and the MSC-IWF during Circuit Switch data networking.
Motorola Implementation A-bis
Motorola’s implementation of GSM A-bis (Mobis) is a modified version of the GSM
A-bis interface (GSM 8.08). Mobis provides increased timing and error handling
capabilities to provide greater radio link reliability and improved link quality. These
modifications include changes in message format and the inclusion of additional
parameters for handover messaging. Modifications adapt the A-bis standard to the
RF link sideband and help to assure timing and mapping of radio link data packets.
Signalling System Seven
Signalling System Seven (SS7) is the routing and control interface between the other
provider networks and the MSC and from the MSC to the BSC-CP. SS7 is used by
the MSC-based InterWorking Function, Short Message Service and Voice Mail.
Interconnect calls use SS7 at the BSC. SS7 is the Message Transfer Link (MTL) and
is implemented in accordance with ANSI SS7-ISUP. CCITT SS7 signaling is used
between the MSC and the HLR and; the MSC and the SMS-SC.