l The bandwidth required by LTE services is larger than the processing capability of the
UMTS 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 UMTS+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 UMTS
and LTE transmission. It is applicable only on the ports on the WMPT and LMPT panels.
l In route backup transmission mode, the FE ports of one type on the WMPT and LMPT
panels are interconnected. The FE ports of the other type on the two boards are connected
to the transport network.
Figure 5-43 shows the transmission cable connections for a UMTS+LTE base station in route
backup mode with IP common transmission when the FE electrical ports on the WMPT and
LMPT are interconnected and the FE optical ports on the two boards are connected to the
transmission equipment.
Figure 5-43 Transmission cable connections for a UMTS+LTE base station in route backup
mode with IP common transmission (1)
Table 5-48 describes the cables.
Table 5-48 Transmission cables for a UMTS+LTE base station in route backup mode with IP
common transmission (1)
SN
Description
T1 and T2 For details, see 5.6.3 FE/GE Optical Cable.
T3 For details, see 5.6.4 Cable Between Two FE
Electrical Ports.
Figure 5-44 shows the transmission cable connections for a UMTS+LTE base station in route
backup mode with IP common transmission when the FE optical ports on the WMPT and LMPT
are interconnected and the FE electrical ports on the two boards are connected to the transmission
equipment.
Figure 5-44 Transmission cable connections for a UMTS+LTE base station in route backup
mode with IP common transmission (2)
BTS3900
Hardware Description 5 BTS3900 Cables
Issue 04 (2011-02-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5-33
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