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ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
Tower Amplifier System Interfaces
Tower amplifier system interfaces must be reserved during installation of
tower amplifier for ZXG10-OB06, including power interface and alarm
interface. In general, these are the interfaces for providing the DC feed
and alarm monitoring. The alarm is detected by the DC current.
ZXG10-OB06 provides +12 V power supply and up to 300 mA current for
the tower amplifier system through the power interface.
In the backbone node alarm mode, the tower amplifier alarm is accessed
and monitored by OB06 through backbone node. When two lines of the
backbone node are connected, or connected at low resistance, it indicates
that there is alarm output for the tower amplifier and the alarm is ON.
When two lines of the backbone node in OB06 are not connected, or
connected at a high resistance, it indicates that there is no output for the
tower amplifier, and alarm is OFF.
Tower amplifier power interface is located on the cabinet top. One ZXG10-
OB06 cabinet can provide three tower amplifier power interfaces.
Man-Machine Interface (MMI)
The MMI is a serial communication interface between ZXG10-OB06 and
local O&M terminal.
It is carried out by the 10-BaseT network interface or RS232 interface
between the CMM and local O&M terminal.
It can be connected to the serial interface of a local O&M terminal
computer or network interface through the ETP interface of the CMM panel.
Protocol Introduction
Two important external interfaces for ZXG10-OB06 (V1.0) are Um and
Abis interface.
On Um and Abis interface, ZXG10-OB06 (V1.0) processes LAPD, LAPDm
and RR/MM/CM protocols. The following are descriptions of the three
protocols in combination with the actual system circumstance.
LAPD Protocol
LAPD (link access procedure of D-channel) is a data link procedure for
signaling transmission between ZXG10-OB06 (V1.0) and BSC. It transmits
messages between Layer-3 entities.
LAPD is a point-to-multipoint communication protocol that utilizes the
frame structure.
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Confidential and Proprietary Information of ZTE CORPORATION
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