ADTRAN T400 Guide de maintenance et de service

1Section 61213017L1-5, Issue 261213.017L1-5B

Section 61213017L1-5

Issue 2, September 1996

CLEI Code #DDRPHJA1_ _

PRACTICES

Figure 1. T400 U-RPM III

C A U T I O N !

SUBJECT TO ELECTROSTATIC DAMAGE

OR DECREASE IN RELIABILITY.

HANDLING PRECAUTIONS REQUIRED.

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,

andupto43mAofsealingcurrent. Whenusedwiththe

ADTRAN ISDN U-Repeater II and III, the U-RPM III

operatesinaconstantcurrentmode,allowingtheoutput

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

VDCto-120VDC. WhenusedwiththeADTRANI-NIU,

the U-RPM III operates in a constant voltage mode,

providing a constant -120 VDC. The output current will

bebetween10and30mA,dependantonloopresistance

between the I-NIU and the U-RPM III. The U-RPM III

automaticallydeterminesthecorrectmodeofoperation,

and does not require option selections.

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

canbe deployedinanystandard T400singleor 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

T400 U-RPM III

U-REPEATER III POWERING MODULE

INSTALLATION/MAINTENANCE

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

2 Section 61213017L1-5, Issue 2 61213.017L1-5B

2. INSTALLATION

After unpacking the unit, immediately inspect it for

possibleshippingdamage. Ifdamageisdiscovered,file

a claim immediately with the carrier, then contact

ADTRAN Customer Service (see section 3,

Warranty

and Customer Service

Select the appropriate grounding option for the U-RPM

III's faceplate using Jumper J1. The faceplate can be

grounded to either the -48V return (A and B) or frame

ground (B and C). When frame ground is selected,

backplaneconnectorpins11or27mustbeconnectedto

Frame /Chassis ground of the housing.

Grasp the T400 U-RPM III by the faceplate and insert it

into a shelf slot. Push the T400 U-RPM III into the

backplane connector until firmly seated.

Voltages to -120 VDC may be present on

output to repeater when the unit is powered.

After installing the U-RPM III and the U-Repeater or I-

NIU, refer to the

appropriate ADTRAN U-Repeater

Installation/Maintenance

practice for installation

verification.

Figure 3 shows the connector pin assignments. All

connections to the unit are made through the T400-

compatible backplane. No additional backplane wiring

is necessary for normal operation.

Figure 2. T400 U-RPM III Application

Figure 3. Connector Pin Assignments

Top

View from

Pin End

Component

Side

-48 V / -72V

FRM GND

-48R

FRM GND

To/From

Office

To/From

ADTRAN U-Repeater/I-NIU

MDF

T400

POWER

MODULE ADTRAN ISDN

U-REPEATER/I-NIU

U-RPM III

CURRENT

SOURCE

43 mA

U-INTERFACE

MAIN

DISTRIBUTION

FRAME

(41)

(47)

(7)

(13)

(11)

(27)

(17)

FRAME GND -48V/-72V BATTERY GND

Customer

NT1

Central Office

REPEATER

POWER

CONVERTER

(35)

ISDN SWITCH or

U-BR1TE

3Section 61213017L1-5, Issue 261213.017L1-5B

If using Frame ground option, backplane

connectorpins11or27must beconnectedto

earth ground.

TheT400U-RPMIIIcanbeinstalledin WesternElectric

MetallicFacilitiesTermination (MFT)mountingshelves.

TheuseofaT400/MFTadapterprovidesthemechanical

andelectrical interfacesrequiredfor properoperationof

theU-RPMIIIintheMFTmounting. T400/MFTAdapters

are available in either a custom wired or an unwired

model from multiple suppliers. The unwired versions

require wire-wrapping to interconnect the T400 56-pin

connectors to the MFT 40-connector.

LOOP FAULT

A faceplate-mounted LED labeled

LOOP FAULT

illuminateswhen theloopisopentotherepeater.

When

installed, the module dissipates approximately 2 watts.

3. WARRANTY AND CUSTOMER SERVICE

ADTRAN will replace or repair this product within ten

years from the date of shipment, if the product does not

meet its published specifications or if it fails while in

service. For detailed warranty, repair, and return

information, refer to the ADTRAN Equipment Warranty

and Return Policy and Procedure.

Return Material Authorization (RMA) is required prior to

returning equipment to ADTRAN. ADTRAN does not

recommend that repairs be performed in the field.

Forservice,RMArequests,orfurtherinformation,contact

one of the following numbers:

ADTRAN Customer Service:

Applications Engineering (800)615-1176

(Pre-Sales Support and Inquiries)

Technical Support (Post-Sales) (800)726-8663

(Have unit serial number available.)

Sales (800)827-0807

RMA (Repair Service) (205)971-8722

Repair and Return Address:

ADTRAN, Inc.

Customer Service Department

901 Explorer Boulevard

Huntsville, Alabama 35806-2807

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