Installation Instructions

Site I/O, Span Line, RGPS and Modem Cabling for Sites Equipped With
Primary Surge Suppressor
– continued
PRELIMINARY
SCt300 BTS Hardware Installation, ATP and FRU Procedures
DEC 2000
5-30
Connecting Customer–Defined
Inputs to the Primary Surge
Suppressor
The unit provides eight customer–defined inputs for connection to
external contacts. Each input (a signal/ground pair) is monitored for an
“OPEN” (>50 k Ohms) or “CLOSED” (<3 Ohms) condition.
Motorola recommends using Customer Input 8 Signal and Ground for
load center alarms. The Primary Surge Suppressor is shipped with the
AC load center alarms already connected. Refer to Figure 5-12.
Connecting the RGPS Cable to
the Primary Surge Suppressor
The RGPS cable (cable M) is connected to the Primary Surge Suppressor
punchdown block (Sync Forward) of the BTS. Table 5-15 provides the
punchdown block to RGPS connections.
Table 5-15: Connecting the RGPS to the Site I/O Cable
Punchdown Block RGPS (Cable M)
Sync Forward
Descriptions
Punchdown Block
Location
RGPS Description RGPS Color Code
(wire/stripe)
Data from Head – OSP14T Transmit Port – Green/Black
Data from Head + OSP14R Transmit Port + Green
Data to Head – OSP15T Receive Port – White/Black
Data to Head + OSP15R Receive Port + White
1 pps from Head – OSP16T 1 PPS Timing – Brown/Black
1 pps from Head + OSP16R 1 PPS Timing + Brown
RGPS 28V
OSP18T Power 1 Blue
OSP19T Power 2 Yellow
RGPS Ground
OSP18R DC Ground 1 Blue/Black
OSP19R DC Ground 2 Yellow/Black
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.
5