ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
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Confidential and Proprietary Information of ZTE CORPORATION
Abis interface is between OB06 and BSC and Um interface is between
OB06 and MS. The B interface is actually an extension of the Abis interface.
The tower amplification system provides the power supply and the alarm
interfaces. The Man-machine Interface (MMI) is an interface between the
Local Maintenance Terminal (LMT) and OB06.
Interfaces
Um Interface
Um interface is between OB06 and MS.
In PLMN, MS connects fixed part of the network through a radio channel to
enable subscribers to access communication services.
There are series of conditions provided to interconnect the MS and OB06,
for signal transmission over the radio channel. A set of standards is set up.
This set of specifications about signal transmission over radio channel is
the Um interface.
The Um interface is designed with a hierarchical model. ZXG10-OB06
implements circuit service protocol. Figure 11 shows the hierarchical
model of circuit service protocol.
F
I G U R E
1 1
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U
M
I
N T E R F A C E
C
I R C U I T
S
E R V I C E
P
R O T O C O L
H
I E R A R C H Y
CM
MM
RR
LAPDm
Sig.L1
Sig.L1
LAPDm
RR
MS
OB06
Um interface
On the Um interface, the circuit service protocol fall into three layers as
follows:
•
The first layer (bottom) is the physical layer. It consists of various
channels and provides the basic wireless channels for upper-level
message transmission.
