ZTE Corporation ZXG-BTS2 Benutzerhandbuch
Chapter 3 - Interfaces and Communications
Confidential and Proprietary Information of ZTE CORPORATION 33
GSM 04.03 describes the channel structure and access capability of the
Um interface.
GSM 04.04 specifies the physical layer structure of the Um interface.
GSM 04.05 specifies the data link layer protocol for the Um interface.
GSM 04.08 stipulates the layer-3 protocols of the Um interface.
Inter-Rack Cascaded Interface of Same
Site
Site
The inter-rack star connection is supported at the same site (one site
supports three BTS racks at most).
supports three BTS racks at most).
The data interface between racks also employs the standard PCM 2M E1
signal to transfer service, TRM signaling, inter-rack O&M signaling and FN
signal to transfer service, TRM signaling, inter-rack O&M signaling and FN
(Frame Number).Service signaling and TRM signaling will be transparently
transmitted, while O&M and FN will be transmitted via the time division
HDLC link.
transmitted, while O&M and FN will be transmitted via the time division
HDLC link.
The inter-rack data interface format is shown in Figure 14.
F
I G U R E
1 4
I
N T E R
-
R A C K
D
A T A
I
N T E R F A C E S I N S I D E A
S
I T E
Inter-rack Downlink Interface
Inter-rack Uplink Interface
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
TS0 SYNC
TS0 SYNC
TS1 CC_COM
TS1 CC_COM
TS2
FN
TS2
The same as Abis interface
TS3 FN
TS4
The same as Abis interface
TS5
The same as Abis interface
TS6
The same as Abis interface
TS7
The same as Abis interface
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TS14 The same as Abis interface
TS15 The same as Abis interface
TS15 The same as Abis interface
TS16 The same as Abis interface
TS16 The same as Abis interface
TS17 The same as Abis interface
TS17 The same as Abis interface
TS18 The same as Abis interface
TS18 The same as Abis interface
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TS31 O&M timeslot
TS31 O&M timeslot