User's Manual

Integrated BTS Router Installation – Introduction
Jun 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU H-1
DRAFT
Background
The IBR capability was developed to provide a low–cost solution for
providing CDMA packet backhaul benefits at cell sites with lower traffic
volumes. The IBR function is implemented by using the GLI3 card
Concentration Highway Interface (CHI) bus 2 processor to perform the
router function. This is accomplished through changes in the GLI3 card
software. A card with the IBR–capable software can perform as a circuit
GLI3 card, as a GLI3 with IBR, and as a GLI3 used with external BTS
router groups. The card has the capability to recognize the environment
in which it is installed and autoselect the appropriate operating mode
(circuit, IBR packet, external BTS router packet).
Span line channel capability for an IBR–equipped SC480 BTS is limited
to those available on a single T1 or E1 span.
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