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Adtran total access 1500 Manual

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2 Issue 1, May 2004 61180019L1-5A
The Total Access 1500 19-Inch Chassis is 19-inches
wide by 3.50-inches high by 10.75 inches deep, and the
chassis mounts in a standard 19 or 23-inch wide rack.
The Total Access 1500 19-Inch Chassis and is made of
heavy gauge metal.
Common Modules
The common modules supported by the Total Access
1500 19-Inch Chassis are described below.
PSU/RGU
The Power Supply Unit/Ring Generator Unit (PSU/
RGU) receives –48 VDC from an external source to
provide all necessary voltages required by the other
common modules and channel units. Two PSU/RGUs
may be installed to provide fully redundant operation.
Through switch mode operation, either PSU converts
the incoming –48 VDC to regulated +3.3 VDC,
+5 VDC, and unregulated –7.5 VDC, –24 VDC, and
–48 VDC for distribution to the other modules. Ring
voltage circuitry within the PSU generates 105 Vrms
nominal, 20 Hz ring voltage for distribution to the
channel bank’s voice modules. Ring voltage is disabled
by removing the 5-amp GMT front panel fuse labeled
20Hz. The PSU/RGU does not require provisioning
prior to insertion into the channel bank.
CAUTION
The Total Access 1500 19-Inch Chassis
requires the use of the List 3 and List 4 PSUs
(P/N 1180007L3, 1180007L4).
SCU
The System Controller Unit (SCU) provides network
management capability for the channel bank. The SCU
is used to provision, test, and determine status for any
module in the channel bank. It is also available in
Central Office Terminal (COT) and Remote Terminal
(RT) versions with Mechanized Loop Testing. The front
panel has craft interface, test equipment timing output,
alarm and status indicators, plus an Alarm Cut-Off
(ACO) switch.
LIU
The Line Interface Unit (LIU) terminates up to four T1
lines, with a separate T1 that is included for protection
switching with the Quad LIU or two T1 lines with the
Dual LIU. The LIU generates control signals and clocks
used by the channel units, and controls both manual and
remotely initiated T1 loopbacks. It detects alarm condi-
tions and reports the alarm status to the SCU.
The LIU front panel has a dual bantam jack for T1 test
access, status LEDs, and a
STATUS pushbutton.
WARNING
If two (redundant mode) List 2 Quad LIUs
(P/N 1180109L2) are utilized in the Total
Access 1500 19-Inch Chassis, the T1 (DSX-1)
interfaces must not be metallically connected
to interfaces that connect to the Outside Plant
or its wiring. These interfaces are designed for
use as intra-building interfaces only. The
addition of Primary Protectors is not sufficient
protection in order to connect these interfaces
metallically to OSP wiring.
It is permissible to connect the T1 (DS-1)
interface metallically to the OSP if only one
LIU (non-redundant mode) is to be used at any
time in the Total Access 1500 19-Inch Chassis.
Access Modules
The Total Access 1500 System incorporates a complete
array of local loop access technologies into an
integrated intelligence system. Most access modules
occupy one slot in the Total Access 1500 19-Inch
Chassis.
The access modules supported by Total Access 1500
System are listed in the Total Access 1500 System
Manual (P/N 61180001L1-1). Refer to individual the
Installation and Maintenance Practices and Job Aids for
detailed information on installation, testing, operation,
maintenance, and troubleshooting.
Compliance
Table 1 shows the compliance codes for the Total
Access 1500 19-Inch Chassis. The 19-Inch Chassis is
NRTL listed to the applicable UL standards. The 19-
Inch Chassis is to be installed in a restricted access
location and in a Type “B” or “E” enclosure only.
Table 1. Compliance Codes
Code Input Output
Power Code (PC) F C
Telecommunication Code (TC) X X
Installation Code (IC) B –
2 …


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