ADTRAN T400 U-RPM III Installation & Maintenance

PRACTICES
CONTENTS

1. GENERAL ...................................................................... 1

2. INSTALLATION ............................................................. 2
3. WARRANTY AND CUSTOMER SERVICE ................... 3
FIGURES
Figure 1. T400 U-RPM III .................................................. 1
Figure 2. T400 U-RPM III Application ............................... 2
Figure 3. Connector Pin Assignments ............................... 2
1. GENERAL
The ADTRAN Type 400 U-Repeater Powering Module
III (T400 U-RPM III) is a T400 card used to power an
ADTRAN ISDN U-Repeater II, U-Repeater III, or the
ADTRAN I-NIU. Figure 1 is an illustration of the unit. It
can be deployed in any standard T400 single or multiple
housing, and is physically located between the U-
Repeater or I-NIU and the ISDN interface, such as an
ISDN switch or U-BRITE, as shown in Figure 2. The U-
RPM III can also be deployed in a Metallic Facilities
Termination (MFT) mounting when used with an
appropriately wired T400/MFT Adapter.
Revision History
Issue 3 has been revised to incorporate the ADTRAN I-
NIU functionality.

Features

The T400 U-RPM III, part number 1213017L1, features:
• Class A3 (-120 V) output voltage operation
• Battery return or earth ground option
• Front Panel LED indicating loop fault
• Passive transmission of data between U-LT and U-
Repeater
• Loop resistance monitoring from power module to U-
Repeater
• Factory replaceable fuse on input voltage line to
isolate from shelf
61213.017L1-5B
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
T400 U-RPM III
U-REPEATER III POWERING MODULE
INSTALLATION/MAINTENANCE
Section 61213017L1-5, Issue 2
Figure 1. T400 U-RPM III

Sealing Current Generation

The T400 U-RPM III converts -48 or -72 VDC input
voltage to provide an output voltage of up to -120 VDC,
and up to 43 mA of sealing current. When used with the
ADTRAN ISDN U-Repeater II and III, the U-RPM III
operates in a constant current mode, allowing the output
voltage to change depending on the loop resistance
between the U-RPM and the U-Repeater. In this mode,
the U-RPM III provides the required constant 43 mA
sealing current, with output voltages ranging from -28
VDC to -120 VDC. When used with the ADTRAN I-NIU,
the U-RPM III operates in a constant voltage mode,
providing a constant -120 VDC. The output current will
be between 10 and 30 mA, dependant on loop resistance
between the I-NIU and the U-RPM III. The U-RPM III
automatically determines the correct mode of operation,
and does not require option selections.
Section 61213017L1-5
Issue 2, September 1996
CLEI Code #DDRPHJA1_ _
1