Ericsson MINI-LINK BAS User Manual

5-3 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
Finally the MAC layer handles the access to the physical medium
providing the following functions:
• TDMA Access
• Handling request and permits to access the shared medium
• Signing-on of new ATs
• Ranging of the new ATs to compensate for propagation delay
• Addressing of ATs
Following the OSI stack, which describes the general structure of a
communication system, we can define the overall architecture of the
MINI-LINK BAS as depicted in the Figure 5-1.
INTERFACE UNITS
TERMINAL NODE
Service
ATM
PHY
Utopia
User interface
Access Termination, AT
ATM
W-MAC
W-LLC
W-PHY
ATM
PHY
ATM
W-MAC
W-LLC
W-PHY
PHY
Air interface
RADIO
NODE
ATM
PHY PHY
Cell bus
Radio - ASS
NNI
NNI
ATM Node
ATM
PHY PHY
CE
ATM
PHY
C- AAS (CE Shelf)
Service Network Interface
ATM
PHY PHY
Figure 5-1 Generic MINI-LINK BAS System Model
5.2 Physical Layer
The service offered by the physical layer is to transfer bits or bit
groups. The protocols of this level manage the link through the
physical media, in the most effective way in terms of channel
allocation, channel bandwidth usage and transmission robustness.
Facilities are implemented in the Physical Layer in order to allow
PMP operations by controlling physical parameters like carrier
amplitude, carrier frequency, symbol clock phase and modulation
index.
The most important functionality handled by this level is implemented
in two specific blocks: the radio and modem units.
Functional schemes for the radio and for the modem units are depicted
in the Figure 5-2 and Figure 5-3.

Ericsson MINI-LINK BAS Specifications

General

Brand	Ericsson
Model	MINI-LINK BAS
Category	Wireless Access Point
Language	English