Site I/O , Span Line, RGPS and Modem Cabling for Sites Equipped With
Customer–Supplied Site I/O Interface
– continued
DEC 2000
4-29
SC
t
300 BTS Hardware Installation, ATP and FRU Procedures
PRELIMINARY
Connecting the RGPS Cable to
the Site I/O Interface
The RGPS (cable M) is connected to the Site I/O interface (Sync
Forward) of the BTS. Table 4-26 provides the Sync Forward to RGPS
connections.
Table 4-26: Connecting the RGPS to the Site I/O Cable
Site I/O Cable
RGPS (Cable M)
Sync Forward
Descriptions
Sync Forward
Color Code
(wire/stripe)
RGPS Description
RGPS Color Code
(wire/stripe)
Data from Head –
Brown/Grey
Transmit Port –
Green/Black
Data from Head +
Brown/White
Transmit Port +
Green
Data to Head –
Red/Black
Receive Port –
White/Black
Data to Head +
Red/Brown
Receive Port +
White
1 pps from Head –
Red/Orange
1 PPS Timing –
Brown/Black
1 pps from Head +
Red/Yellow
1 PPS
Brown
RGPS 28 V
Red/Purple
Power 1
Blue
Red/White
Orange/Brown
Power 2
Yellow
Orange/Yellow
RGPS Ground
Red/Grey
DC Ground 1
Blue/Black
Orange/Black
Orange/Red
DC Ground 2
Yellow/Black
Orange/Green
NOTE
The RGPS must also be ground referenced to the BTS “digital” ground. This is done by
connecting the Red/Grey lead (RGPS Ground) from the Sync Forward Interface to the
Black/Blue lead (Customer Input 8 Ground) from the Customer Input interface.
Connecting the Span Line
Cable to the Site I/O Interface
The unit provides two, four–wire JT1 interfaces for backhaul support.
Each interface is made up of Transmit Tip/Ring and Receive Tip/Ring
connections.
The Transmit and Receive data flow is given from the perspective of the
unit. Only a single span line (Primary) is required for BTS operation.
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