ZTE Corporation ZXG-BTS2 Manuale Utente

 
 

Chapter 1 - System Architecture 

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ii. DBS 

The whole application layer is designed with the database as a core. 
The database coordinates to assign configuration parameters and 

also synchronizes data between the active and standby CMMs and 
the foreground and background. 

iii. LMU 

It is the local O&M unit, including two parts: foreground agent and 
background operation interface.  
It works with the database synchronization module to complete the 
local parameter configuration, equipment status and alarm 

collection. It also includes operating interface of equipment test to 
implement test functions of the local BTS.  
The system tool part is a series of developer-oriented tools for 
system diagnosis and test to rapidly locate faults.  

FUC 

FUC (Frame Unit Controller)  

The FUC software module is located in the TPU of the TRM module. It 
processes the radio signaling over every radio carrier and signaling on the 
BSC interface and manages all channels. Its major functions are as follows:  

1.  Responsible for processing and converting GSM signaling protocols, 

including the layer-2 protocol LAPD with BSC, the layer-2 protocol 

HDLC with CMM, the layer-2 protocol LAPDm with the Um interface and 
the layer-3 radio resources management protocol of GSM.  

2.  Responsible for the TDMA multi-frame framing on the Um interface, 

frame number (FN) receiving, frequency hopping calculation and 

management & control over CHP. 

3.  It also manages BTS and loads the FUC software and DCP program. It 

supports global packet switching services (GPRS or PS for short). 
The whole FUC software can be divided into two layers: system 
software and application, as shown in Figure 8.