l
The bandwidth required by LTE services is larger than the processing capability of the
GSM standard transport network. Therefore, when the secondary channel is used, the
Quality of Service (QoS) of only high-priority data flows can be guaranteed.
In a GSM+LTE base station, the following limitations on the route backup transmission mode
apply:
l
The route backup function is not applicable when the base station uses the IP over E1
transmission.
l
The route backup transmission mode is not applicable on the ports on the UTRPs for GSM
and LTE transmission. It is applicable only on the ports on the GTMU and LMPT panels.
l
In route backup transmission mode, the FE ports of one type on the GTMU and LMPT
panels are interconnected. The FE ports of the other type on the two boards are connected
to the transport network.
shows the transmission cable connections for a GSM+LTE base station in route
backup mode with IP common transmission when the FE electrical ports on the GTMU and
LMPT are interconnected and the FE optical ports on the two boards are connected to the base
station controller.
Figure 5-31
Transmission cable connections with FE electrical ports for interconnection and
FE optical ports connected to the base station controller
Table 5-36
Transmission cables with FE electrical ports for interconnection and FE optical ports
connected to the base station controller
SN
Description
T1 and T2
For details, see
T3
For details, see
FE Optical Ports for Interconnection and FE Electrical Ports Connected to the BSC
and RNC
shows the transmission cable connections for a GSM+LTE base station in route
backup mode with IP common transmission when the FE optical ports on the GTMU and LMPT
are interconnected and the FE electrical ports on the two boards are connected to the base station
controller.
Figure 5-32
Transmission cable connections with FE optical ports for interconnection and FE
electrical ports connected to the base station controller
5 BTS3900 Cables
BTS3900
Hardware Description
5-26
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Issue 04 (2011-02-15)