Glossary
826 88000 Series
OBSAI
OBSAI RP3-01 System Architecture
OBSAI remotely locates the RRH from the BTS. This means that the RRH
must be controlled, managed and synchronized from the BTS in addition to
transporting the User information (Voice and user application data) and all
that on the same digital link, the RP3-01. As such, an OBSAI interface is
composed of 3 communication flows sent in the same optical fiber in the
form of continuous messages as illustrated in the following diagram.
The OBSAI link parameter alignment setup is driven by two paired TX and
RX state machines; one pair located on the BTS acts as a Master and the
other located at the RRH acts as a Slave. The Master initiates the
negotiation procedure necessary to achieve this alignment.
Data: User Data Messages (IQ Data) which represents the voice and
data information that is exchanged by End-User Equipment
Control: Call Processing/OAM&P messages (Generic Ctrl and RP3
Ethernet messages)
Synchronization: Frame synchronization messages
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