Patent ID: 11923905
Assignee: COMBA NETWORK SYSTEMS COMPANY LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 9:
10. The distributed antenna system according to claim 1, further comprising the source unit connected to the digital-analog expansion unit, wherein:
the source unit is a BBU or an RRU;
if the source unit is the RRU, the distributed antenna system further includes an access unit connected between the RRU and the digital-analog expansion unit; and
the access unit is configured to perform a baseband processing operation on a received external signal through a second baseband processing module inside the access unit, and to perform interconversion of an analog radio frequency signal and a digital radio frequency signal through a second signal conversion module inside the access unit, to obtain a third uplink analog radio frequency signal to be transmitted to the RRU or a downlink digital radio frequency signal to be transmitted to the digital-analog expansion unit.