Chain Networking - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station

8.5.2 Chain Networking

I. Application scope
Chain networking of the BTS is shown in Figure 8-4. It is applicable to sparsely
populated stripe areas, e.g. along the highways and railways.
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Figure 8-4 BTS chain networking
II. Advantage
The adoption of the chain networking mode can scale down the expenditure on
transmission equipment, engineering construction, and lease of transmission links.
III. Disavantage
The signals go through more nodes in the chain networking mode, the line reliability
is poor.
The failure of upper-level BTS may affect the normal operation of lower-level BTS.
Maximum three-level cascading is allowed. That is, the nodes cascaded should not
exceed 3.
IV. Implementation
Chain networking is realized through the transmission trunk function of the BTS. The
transmission trunk is essentially Virtual Path (VP) switching. One BTS can be
configured with maximum 10 trunk links.
Note:
ATM switching is divided into two types: VP switching and Virtual Channel (VC)
switching. In the VP switching process, only the value of VPI is changed, while the
value of VCI is transmitted transparently. In the VC switching process, values of both
VPI and VCI remain unchanged. The VP is equivalent to a large channel, while the
VC a small one.
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8-9
Chapter 8 BTS Configuration
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System Principle