User's Manual

Open Information
DESCRIPTION 15 ( 19 )
ERA/RGN/PD Rikard Schönbeck 5/1551-HRB 105 102/1 Uen
ERA/RGG/TOC Jan Lundkvist 2002-05-28 B
Prepared (also subject responsible if other) No
Approved Checked Date Rev Reference
E
Function group Task
Infrastructure Infrastructure functions handle
power feeding, environmental control
and basic infrastructure software
functionality. These functions are
managed through the Mub interface.
User Interface The user interface handles the GUI.
This function group contains the GUI
functionality.
5.2 Platform Functions
The Platform contains all the functionality necessary to switch ATM cells and
variable length cells (that is, ATM Adaptation Layer type 2 (AAL2) Common
Part Sublayer (CPS) packets) within an ATM-based telecommunications
network. It also includes CCITT Signalling System number 7 (SS7) support
(Signalling Connection Control Protocol (SCCP) Message Transfer Part layer
3 broadband (MTP3b) as well as functionality for network signalling using
Q.2630.1 for AAL2 connections.
6 External Interfaces
The RBS is connected to the outside world through the Iub, Uu and Mub
interfaces. Besides these interfaces the RBS also provides a management
GUI that uses the Mub, and a Visual and Mechanical Interface (VMI), which
comprises indicators, switches, buttons, cables, and so on. An overview of
the external interfaces is given in figure 5. Descriptions of the interfaces are
given below.
Figure 5 External Interfaces
6.1 lub Interface
The Iub interface is the interface between the RBS and the RNC. The Iub is
divided into several protocol layers as follows:
• Physical layer (L1)
• ATM and ATM adaptation layers (L2)
• Network layer (L3) for frame handling
The L3 protocol for the RNC plane is called NBAP. The L2 and L3 part of
air interface channels RACH, FACH, PCH and DCH terminate in the RNC.