User's Manual
Span Line Daisy Chain Cabling
DRAFT
SC300 1X BTS Hardware Installation, ATP, and FRU Procedures
JAN 2002
4-32
Objective
The objective of this procedure is to install span line cabling between
multiple BTS sites in an open daisy chain configuration.
Background
This feature allows up to 12 BTS sites to be linked together in an open
daisy chain loop using a single T1/E1 span. This will reduce the number
of spans necessary to support a CDMA system and minimize unused
channels.
Each multi–unit logical BTS may contain up to four units. A maximum
of 12 BTS sites may be combined in a single daisy chain.
Required Cables
The following cables in Table 4-32 are necessary to do this procedure.
Table 4-32: Required Cables for Span Line Daisy Chain Cabling
Cable Qty. Part Number Description
N 1–3 Customer
Supplied
Span Line Daisy Chain Cable
Procedure
Attach the span line daisy chain cable (Cable N) to the site I/O interfaces
of each BTS. Refer to Figure 4-20 and Table 4-33.
Cable Connections
Table 4-33 shows the cable run information for span line daisy chain
cabling.
For a full signal description of the Site I/O cable refer to Table 4-23 in
the “Site I/O, Span Line, RGPS and Modem Cabling” procedure.
The pin number and wire color are based on the Site I/O
cable. The pin number corresponds to pins on the Site I/O
junction box connectors.
NOTE
Table 4-33: Cable Run List for Span Line Daisy Chain Cabling
BTS (Secondary Backhaul) BTS (Primary Backhaul)
Color Description Color Description
Yellow/Black RX TIP Orange/Grey TX TIP
Yellow/Brown RX RING Orange/White TX RING
Yellow/Red TX TIP Orange/Blue RX TIP
Yellow/Orange TX RING Orange/Purple RX RING
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