Zte ZXG10 OB06, Technical Manual

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Chapter 1 - System Architecture
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ii. RUNCTRL
It is the operation control layer of the system.
It includes the system control module and implements the power-
on sequence for application processes. In addition, this layer
includes some miscellaneous functions of the operating system
such as redirection of the printing messages.
iii. LNKDRV
It is the device driver.
Working with BSP, LNKDRV provides equipment-independent
drivers for LNKCTR. At the same time, this part also includes a
frame number synchronization module, implementing the frame
number synchronization between active/standby CMMs, active
CMMs of the base cabinet and the extension cabinet, and master
CMM and TRMs.
iv. LNKCTRL
It is the communication link control layer module.
It consists of multiple communication link control modules, like
LapD, HDLC, LMComm.
LapD communication link control module
LapD is the communication link control module of the Abis interface.
HDLC communication link control module
HDLC is the communication link control module inside the cabinet.
They all communicate in a point-to-point way.
Currently, there are three types of communication links:
CCComm: It is the auxiliary communication link between the
master CMM of the base cabinet and that of the extension cabinet.
Physically, it is a 2 M PCM line, which facilitates the centralized data
collection of LMU.
CMComm: The communication link between the active and standby
CMMs, implementing the data synchronization between them.
Physically, it is a 1M HW.
CTComm: As the communication link between the active CMM and
1 ~ 12 TRMs of its cabinets, the CTComm implements the
parameter configuration of TRM and alarm collection. Physically, it
uses a 64 Kbit/s timeslot in 4 M HW.
LMComm
Foreground/background link control module with RS232 as its
physical interface. It is a self-defined point-to-point link control
protocol and character-oriented single-bit stop and wait protocol.
5. APP layer
It is the application layer. It consists of three parts:
i. O&M
As the core of the application layer, it receives the O&M messages
of the Abis interface and implements parameter configuration,