Specifications

Base Site Controller
iDEN® System
August 08, 2000 68P81095E55-E 2-17
Figure 2-9 .Typical Base Site Controller
Functional Characteristics
The BSC provides control and concentration functions for one or more EBTS sites
and their associated mobile stations. The functions are segregated into separate
circuits to improve the adaptability of the system to the local network requirements.
The functions include:
• Link concentration from multiple EBTS sites
• Conversion of the radio link to the land network format
• Handover data collection, preparation, and execution to sites under its control
• Operation, maintenance and administration agent for OMC X.25 network
• Call Processing control of interconnect audio
Link Concentration The number of remote cell sites that can be linked to a single BSC will depend on the
traffic, location and outgrowth potential of the network. The T1/E1 span lines from
the EBTS sites link to a MegaStream Interface (MSI) card in the BSC rack. Since
the configuration of the BSC will limit the number of available slots for MSI cards,
the number of EBTS sites a BSC can support may vary.
Radio Link
Conversion
The conversion of the radio link is handled by the Transcoder (XCDR) or the
Enhanced Transcoder (EXCDR). These cards convert between the Vector Sum
Excited Linear Predicting (VSELP) compressed signal from the radio link to 64 kbps
PCM used on the PSTN.