In this article, HongTelecom presents the hardware components and device information of a BBU3910/BBU3900. It provides reference for planning and deploying a BBU3910/BBU3900.
- Product Introduction
BBU3910/BBU3900 is a baseband control unit of DBS3900.
The BBU3910/BBU3900 adopts a 2U-height subrack on which an ESN is labeled.
- Slot Assignment
This chapter describes the slot distribution, the principles for BBU3910/BBU3900 slot assignment and the typical configuration of BBU3910/BBU3900 boards.
- Manages the entire base station system by means of operation and maintenance (O&M), and signaling processing.
- Provides a system clock.
- Processes uplink and downlink data.
- Enables information exchange with the transport network.
- Communicates with the RF module.
- Provides a maintenance channel connected to eLMT or eOMC910 (centralized OM system).
Figure 1 shows the BBU3910/BBU3900appearance.
- Combines all inserted boards as an independent unit using the backplane.
- Prevents boards from damages due to unfavorable environment.
- Provides channels for heat dissipation.
BBU3910/BBU3900 subrack dimensions (H x W x D): 86 mm x 442 mm x 310 mm. The four-layered subrack can house 8 service boards, 2 power modules, and 1 fan module. Figure 2 shows the subrack logical structure of the BBU3910/BBU3900.
- When a label is provided on the FAN module that is installed in the subrack, print the ESN on the label and a mounting ear of the subrack, as shown in Figure 3.
- When a label is not provided on the FAN module that is installed in the subrack, print the ESN on a mounting ear of the subrack, as shown in Figure 4.
The ESN is a unique identifier of an NE, which is used during base station commissioning.
Figure 5 shows the BBU3910/BBU3900 slot distribution.
- The BBU3910/BBU3900supported subrack includes BBU3910 and BBU3900. A BBU3900 subrack has no silkscreen. A BBU3910 subrack has a BBU3910 silkscreen.
- A FANe or UPEUd can be installed only in a BBU3910, a FANc or UPEUc can be installed only in a BBU3900.
- The BBU3910 only supports UMPTb2 and UBBP, does not support LMPT and LBBP.
One UMPTb2 or LMPT with the GPS satellite card is configured in each BBU3910/BBU3900 by default. The recommended slot is 7. In cold backup ring topology, two UMPTb2 need to be configured and the LMPT is not supported.
This board is configured when the GPS and GLONASS satellite cards are required or in the 1PPS+TOD time synchronization scenario. The USCUb22 board occupies two slots. That is, if the board is installed in slot 5, slot 4 is also occupied.
Typical configuration of boards
Figure 6 shows the typical configuration of boards in an BBU3910/BBU3900.
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