Operation Manual

61180019L1-5A Issue 1, May 2004 7
5. Using a screwdriver appropriate for the fuse and
alarm panel terminals, and a straight slot or phillips
screwdriver for the Total Access 1500 19-Inch
Chassis power terminal, connect the ends of one
wire between the “A” CO –48 VDC supply and the
–48V PRI IN terminal on the Total Access 1500 19-
Inch Chassis backplane.
6. Connect three more power wires, connecting the
“A” CO –48 VDC return with
–48V PRI RTN; “B”
CO –48 VDC supply with
–48V SEC IN; and “B”
CO –48 VDC RTN with
–48V SEC RTN.
Apply Power and Check Voltage
Before proceeding further, ensure that power has been
correctly applied to the Total Access 1500 19-Inch
Chassis. The proper voltage to the Total Access 1500
19-Inch Chassis is –48 VDC, with an operating range of
–42 VDC to –56 VDC.
WARNING
Installing fuses in the fuse alarm panel at this
stage will provide power to the Total Access
1500 19-Inch Chassis. There will be power to
pins on the backplane and inside the Total
Access 1500 19-Inch Chassis. Exercise caution
to avoid electric shock.
NOTE
The Total Access 1500 19-Inch Chassis may
be powered by multiple power sources.
Disconnect all sources prior to servicing.
NOTE
The branch circuit over-current protection
shall be a fuse or circuit breaker rated for a
maximum of –48 VDC @ 5.0 A. Include the
appropriate input current rating for the
product.
1. Install appropriate fuses (5 amp max) in the slots in
the fuse and alarm panel that services the Total
Access 1500 19-Inch Chassis.
2. Using a voltmeter, place the common (normally
black) lead on the
TB1 –48V PRI RTN terminal and
the DC volts (normally red) lead on the
TB1
–48V PRI IN
terminal. The reading should be in the
operating range of –42 VDC to –56 VDC, with a
nominal value of –48 VDC. Note the “negative”
polarity.
3. Using a voltmeter, test the connection using the
TB1 –48V SEC RTN terminal and the TB1 –48V
SEC IN
terminal.
4. Remove the fuses from the fuse and alarm panel
slots that provide power to the Total Access 1500
19-Inch Chassis.
Ring Generator
The Total Access 1500 System operates with either an
internal or external ring generator. For external ring
generator applications,
TB2 (see Figure 6) provides
terminal connections for ringing voltage, ringing return,
and frame ground.
Figure 6. Ring Generator Terminal
Composite Clock Connections
An external composite clock input is required in the
COT when deploying digital services from the Total
Access 1500 System. The following steps provide
instruction on how to connect primary and secondary
external composite clock signals to a single Total
Access 1500 19-Inch Chassis.
1. Determine the “+”, “–” and drain or ground wires
from the CO clock source.
2. Using wire strippers, strip 1 to 1-1/2 inches of the
insulation from the end of the clock source twisted
pair, shielded, drop wire.
3. Using the wire-wrap tool, wire wrap the “+” wire
from the clock source to the pin marked
+ on
connector
P14, Clk in Pri.
4. Wire wrap the “–” wire from the clock source to
the pin marked
– on connector P14, Clk in Pri.
5. Wire wrap the drain or shield wire from the clock
source to the pin marked as ground on connector
P14, Clk in Pri.
TB2
2
0
H
Z
R
T
N
1
3