Coastcom D/I Mux III System User Manual

D/I Mux III System

For D/I Mux III Shelf and Common Equipment

USER’S MANUAL

30000-100-MOD

Issue C

November 2005

PUBLICATION RELEASE RECORD

Publication Number: 30000-100-MOD Publication Name: D/I Mux III System User’s Manual

DATE ISSUE ECO NO. REASON FOR CHANGE

Aug 1997 A Combine CCU and AMCU. Add new

standard LIUs. Add FLIU. Revise to Feature Group upgrade.

February

2002

November

2005

B 302-267 Delete FLIU Appendix.

Add new warranty page. New cover.

C Add new Power Supplies and Ringing

Generator

D/I MUX III User’s Manual

RELEASE NOTE December 2005

UPGRADED –24VDC Power Supply for D/I Mux III

Coastcom has released part number 30314-902, -24Volt DC Power Supply to replace 30314-101.

30314-902 Power Supply –24 VDC Redundant

The 30314-902 is a DC-to-DC converter used to power D/I Mux equipment from an external -24 VDC input supply. Generates +/-12 and +/-5 volt outputs as well as failure alarm signals. Also provides primary (-24v) power fusing. Can be used in a redundant or load sharing configuration when two power supplies are installed. When configured with FXS cards order modular Ring Generator 30333-121. Can be used in an 8/12/24 slot chassis. Replaces 30314-101.

RELEASE NOTE August 2005

UPGRADED POWER SUPPLY UNITS FOR D/I Mux III

In August 2005, Coastcom released upgraded power supply units for the D/I Mux III. The following two new units replace part numbers 30338-102, 30315-105A, 30338-103A, and 30308102A.

30338-902 Power Supply -48 VDC Redundant

The 30338-902 is a DC-to-DC converter used to power D/I Mux equipment from an external -48 VDC input supply. Generates +/-12 and +/-5 volt outputs as well as failure alarm signals. Also provides primary (-48v) power fusing. Can be used in a redundant or load sharing configuration when two power supplies are installed. When configured with FXS cards order modular Ring Generator 30333-101. Can be used in an 8/12/24 slot chassis. Replaces 30338-102.

30315-505 Power Supply 120 VAC

An AC/DC self-contained single-slot power supply that provides all of the voltages necessary to operate a D/I Mux III - except ringing voltage. When configured with FXS feature cards, order modular Ringing Generator 30333-101. Provides +/-12, +/-5, and –48 volts. Can be used in an 8/12/24 slot chassis. Replaces a 30308-102A and the combination option of 30315-105A with 30338-103A. Cannot be used in combination with any other power supply.

D/I MUX III User’s Manual

RELEASE NOTE August 2005

RING GENERATOR MODULE FOR D/I Mux III

Introduction:

The 30333-101 / 121 Ring Generator provides internally generated ringing voltage for AC or DC powered D/I Mux III shelves with 2W FXS and Smart Omni-Orderwire feature cards. The 30333-101 is a –48 volt powered unit while the 30333-121 is a –24 volt powered unit. It provides up to 15 watts of continuous, superimposed (ringing voltage referenced to the negative battery supply voltage) sine wave ringing voltage. The nominal frequency is 20 Hertz. A front panel green LED indicates the presence of power to the card. A red LED and relay contact closure indicate generator failure.

Installation:

The 30333-101 / 121 Ring Generator can be installed in any of three available areas of the D/I Mux III shelf: Power Supply, Feature Card or UCOM (FDLP). In any of the three locations, it automatically configures itself to operate. It can be installed or removed while the shelf is in operation (hot swapped).

When installed in the UCOM location the accessory 30333-101-UC cable must be in place on the back of the shelf to complete installation.

Installation of 30333-101-UC cable. Note: this cable is installed only when the Ring Generator is located in the UCOM (FDLP) card slot. This cable is included with each 30333101 or 30333-121 unit.

At the rear of the shelf, plug the 30333-101-UC cable’s DB-25 male connector into the DB-25 female UCOM2 location. Plug the white Molex connector into the mating shelf Molex connector marked “AUX SHF I/F”. Unscrew the two screws marked “MNR ALM” on the screw-down barrier strip. Install the two cable wires with the ring lugs. Put one under each screw head. Connections for failure alarm are made at this location on the barrier strip.

DB – 25 – M MOLEX WIRE

AMP 205208-1 Shell 39-01-2160 18 AWG AMP 66570-3 Pins w/39-00-0039 Insulated AMP 206478-3 Hood Female Pins Hookup, Pairs Twisted

D/I MUX III User’s Manual

PIN-OUT CONNECTIONS

COLOR NAME PIN MOLEX

RED Alarm 1 2 -------------------------------------------------------------Æ Ring Lug ORANGE +5V 3 ----------------------------Æ 11 YELLOW Alarm 2 4 -------------------------------------------------------------Æ Ring Lug BLUE Ringer 6 ----------------------------Æ 6

Failure Alarm:

The 30333-101 / 121 provides relay contact closure (1 ampere maximum) for an external alarm upon ringing generator failure. For Power Supply and UCOM locations, the connection location is at the “Minor Alarm” terminals on the back of the D/I Mux III shelf. For a Feature Card location the alarm contacts appear on the associated card slot’s DB-25 connector on the rear panel, at pins 18 and 20.

Providing Ringing Voltage to Other Equipment:

The ringing voltage from the generator is available at the back of the shelf (marked “20 Hz”) for connection to other applications (including D/I Mux III shelves) that require superimposed ringing voltage. Be sure to securely ground all equipment using common ringing voltage to the common ground connection on the D/I Mux III shelf that houses the Ring Generator. Care should be exercised to keep the total continuous ringing load at or below the specified 15 watt capability.

Attention should also be paid to overall loading – if an internal AC/DC power supply is installed in the shelf with the 30333-101 Ring Generator and the unit also powers additional shelves – the AC/DC power supply has to power all –48 Volt requirements in the shelf (CSU and talk battery for FXS and Smart Omni Orderwire, etc.) along with powering the Ring Generator. If in doubt regarding an application with high internal AC powered loading, contact Coastcom application engineering (800-433-3433).

Caution:

This unit must be installed in a properly grounded D/I Mux III shelf. Hazardous voltages are present on the Modular Ring Generator printed circuit card traces. Do

not operate this card on a card extender while operating in the shelf.

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D/I MUX III User’s Manual

Product Description

Coastcom's D/I Mux III™ is an intelligent drop-and-insert T1 multiplexer for voice, data, and special service applications. It offers programmable software for monitoring and controlling configurations, transmissions, alarms, and diagnostics. Intelligent channel cards permit software access to individual circuits.

D/I Mux III accesses one or two T1 transmission lines, and interfaces up to 48 DS0 transmission channels. Voice, data, video, and special services are provided in any combination within a D/I Mux III. With the addition of Coastcom's 5-port Subrate Data Multiplexer (SDM) line cards, up to 120 data circuits are supported in a single multiplexer.

Special features of the D/I Mux III are its network compatibility, remote control capability, integral T1 channel service unit, and standard copper wire Line Interface Units (LIU). Also, AC power supply with ringer, redundant DC power supply option, and Automatic Loop Protection Switching (ALPS™) as an optional feature for data protection in the event of transmission failure. There are also several unique channel cards that offer services such as high quality audio, links to other T1 systems, and on-line selectable high speed data.

All equipment specifications subject to change without notice.

Specifications

Multiplexer Requirement

Model: D/I Mux III

Software Versions:

Common Control Unit (CCU) (30305-106/108): 8.1/9.1 (or above) Previous CCU Feature Group: 6.0/8.0 (or above) Common Control Unit (CCU) (30305-110) 1.8 (or above) ALPS CCU (30305-109) 9.8 (or above) Multiplexer Control Unit (MCU) (40305-103) 1.4 (or above) Previous MCU Feature Group: 1.3 (or above) Advanced Multiplexer Control Unit (AMCU) (40305-104) 1.8 (or above)

Line Interface Units Requirement LIU Models: 30309-104/114

Design Compliance

Complies with applicable sections of AT&T publications 43801, 54018, 54075, 62310 and 62411 Complies with applicable sections of ANSI publications T1.403, and T1.107 Complies with regulatory standards:

FCC Part 15, Subpart B, Class A; FCC Part 68 DOC CS-03 UL/CSA standards certified by CSA

Copyright© 1997 by Coastcom. All Rights Reserved. Printed in the United States of America. No Coastcom document, or parts thereof, may be reproduced in any form without prior written permission from Coastcom except where otherwise noted. The information in this manual is subject to change without notice. D/I Mux III, ALPS, and T1M CSU/DSU are Trademarks of Coastcom

ACCUNET

and MEGACOM® are registered Trademarks of AT&T.

D/I MUX III User’s Manual

D/I Mux III User's Manual Organization

This D/I Mux III User's Manual is written for use by technical planners as well as operation and installation personnel.

The D/I Mux III User's Manual is organized in the following order:

• System Overview and Modes of Operation

• Applications

• Installation

• Configuration and Operation

• Diagnostics

• Appendices

Coastcom recommends a thorough review of the content and organization of this manual. An extensive table of contents provides easy access to installation and maintenance information. At each step of the installation process, applicable procedures should be re-read carefully to ensure that the required tools and components are available for successful installation and operation.

D/I MUX III User’s Manual

REGULATORY INFORMATION FCC NOTICE

Federal Communications Commission (FCC) Part 15 Regulations For Telephone Equipment

NOTE: This equipment has been tested and found to comply with the limits for class A digital device, pursuant to

Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at their own expense.

IMPORTANT: This product was tested for FCC compliance under conditions that included the use of shielded

cables and connectors between components. Changes or modifications to this product not authorized by the manufacturer could void your authority to operate the equipment.

FCC Part 68 Requirements

Note: FCC Rules Part 68 require the following information to be included in this publication. Some of the information may

not be relevant to Coastcom equipment.

FCC regulations and telephone company procedures prohibit connection of customer-provided equipment to telephone company provided coin service central office implemented systems. Connection to party line service is subject to state tariffs. The applicable state public service commission should be contacted for information.

The telephone company may require disconnection of the user provided equipment in the event of a natural disaster or other situation where damaged equipment could cause harm to the public telephone network.

Upon request, local telephone companies will provide information concerning questions about telephone lines, such as how many pieces of equipment may be connected to it.

FCC Requirements for Connection of Systems to the Telephone Network

This equipment complies with the requirements of part 68 of the FCC rules. Coastcom, Inc.

Coastcom Series of T1 Multiplexers FCC Registration Number CRGUSA-17575-XD-N (with DSX Interface) FCC Registration Number CRGUSA-60682-DD-N (with Internal CSU Interface)

Affixed to the equipment is a label containing the FCC registration number and the Ringer Equivalence Number (REN) for this equipment. A list of the system interfaces, their Facility Interface Codes (FICs), and their Universal Service Order Codes (USOCs) is provided. The telephone company has the right to request the following information:

• Quantities and USOC numbers of the required jacks

• Sequence in which the trunks are to be connected

• FICs by position

• REN or service code, as applicable, by position

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D/I MUX III User’s Manual

The REN is used to determine the quantity of devices that may be connect to the telephone line and still have assurance that all of those devices will ring properly when the applicable number is called. In most, but not all areas, the sum of the RENs of all devices should not exceed five (5). To be certain of the number of devices that may be connect to a line, as determined by the RENs, the local telephone company should be contacted for information on the maximum REN for that calling area.

Regulatory Codes

Type of Interface USOC Jack

Connector

1.544 Mbps N/A 6.0p *

2 Wire Loop Start RJ21X 2.4 A (AC) 4.4 (DC) 02LS2

2 Wire Ground Start RJ21X 2.4 A (AC) 4.4 (DC) 02GS2

2 Wire E&M Type I RJ2EX 9.0F TL11E

2 Wire E&M Type II RJ2FX 9.0F TL12E

4 Wire E&M Type I RJ2GX 9.0F TL31E

4 Wire E&M Type II RJ2HX 9.0F TL32E

REN/Service Order

Code

Facility Interface

Code

OPS Class C RJ21X 9.0F OL13C

T1 (D4 Framing)** RJ48C 6.0P 04DU9-B

T1 (ESF Framing)** RJ48C 6.0P 04DU9-C

OCUDP RJ48S 6.0P 04DU5-56

Integral CSU

RJ48C 6.0P 04DU9-B

(D4 Framing)**

Integral CSU

RJ48C 6.0P 04DU9-C

(ESF Framing)** Dual 4 Wire Deluxe RJ2GX 9.0F TL31E Dual 4 Wire Deluxe RJ2HX 9.0F TL32E

Tandem T1 Unit N/A 6.0P 04DU9-BN Tandem T1 Unit N/A 6.0P 04DU9-DN Tandem T1 Unit N/A 6.0P 04DU9-1KN

Tandem T1 Unit N/A 6.0P 04DU9-1SN All Rate OCUDP RJ48S 6.0P 04DU5-24 All Rate OCUDP RJ48S 6.0P 04DU5-48 All Rate OCUDP RJ48S 6.0P 04DU5-96 All Rate OCUDP RJ48S 6.0P 04DU5-56

* In some cases connection of this system requires filing an affidavit with the telephone company. When connecting a system configured without an integral CSU, report the FCC registration number which contains the equipment code "XD". An external FCC registered CSU is required to connect "XD" category equipment to the

1.544 Mbps public network. The Facility Interface Code is determined from the CSU.

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D/I MUX III User’s Manual

** In some cases, connection of this type of system requires filing an affidavit with the telephone company. When connecting a system configured with an integral CSU, report the FCC registration number which contains the equipment code "DD".

For metallic channel ports, please be aware that metallic pair services may not be available in all locations. If any telephone equipment causes harm to the telephone network, the telephone company may temporarily

discontinue service to that line. If possible, the phone company will give advance notice of such discontinuance. If advance notice is not practical, notice will be given as soon as possible. The telephone company will also advise of the right to file a complaint with the FCC.

The telephone company may make changes in its facilities, equipment operations, or procedures that could affect the proper operation of user equipment. Advance notice of changes should be given by the telephone company to provide an opportunity to maintain uninterrupted service.

Repair Services

In the event equipment repairs are necessary, contact Coastcom for factory service. Customer repairs of Coastcom equipment should be limited to module replacement and/or front panel servicing. For information, contact:

Coastcom 1141 Harbor Bay Parkway Alameda, CA 94502-6511 Tel: 800 433-3433 510 523-6000 FAX: 510 523-6150 Technical Support: 800 385-4689

D/I MUX III User’s Manual

SAFETY AGENCY CERTIFICATIONS

Canadian Standards Association (CSA) certifies that D/I Mux III equipment meets the requirements of Underwriter’s Laboratories (UL), as applicable, for the United States, and those of CSA, as applicable, for Canada.

When a DC powered system is purchased to be resold to another customer, or when purchased to be used as part of another system, the system is referred to as a Rack Mounted Card Cage and is CSA Certified. Power supplies and channel line cards which connect to the public telephone network are CSA Certified as components.

When a system is sold directly to a customer, and the system is configured with an internal AC power supply, for customer premises applications, then the product is referred to as an Intelligent Multiplexer Card Cage and is CSA Listed. To satisfy safety agency requirements, the user is advised that D/I Mux III equipment is “To be installed only in Restricted Access Areas (Dedicated Equipment Rooms, Equipment Closets, or the like) in Accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code, ANSI/NFPA No. 70.”

INFORMATION FOR CANADIAN CUSTOMERS

Equipment Attachment Limitations (Canada Only): CP-01, Part I, Section 10.1

NOTICE: The Canadian Department of Communications label identifies certified equipment. This certification

means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.

Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas.

CAUTION: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate.

CP-01, Part I, Section 10.2 NOTICE: The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be

connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the LN (Load Numbers) of all the devices does not exceed 100.

D/I MUX III User’s Manual

TABLE OF CONTENTS

RELEASE NOTE UPGRADED POWER SUPPLY UNITS FOR D/I MUX III.............................................................I

RELEASE NOTE

Design Compliance ....................................................................................................................................v

Federal Communications Commission (FCC) ............................................................................................vii

Part 15 Regulations For Telephone Equipment.......................................................................................... vii

FCC Part 68 Requirements........................................................................................................................vii

FCC Requirements for Connection of Systems to the Telephone Network................................................vii

Repair Services..........................................................................................................................................ix

SAFETY AGENCY CERTIFICATIONS ......................................................................................................x

INFORMATION FOR CANADIAN CUSTOMERS ......................................................................................x

Equipment Attachment Limitations.............................................................................................................x

CHAPTER 1. SYSTEM OVERVIEW AND MODES OF OPERATION.....................................................................1

D/I Mux III Capabilities................................................................................................................................1

D/I Mux III Functions ..................................................................................................................................2

D/I Mux III Features....................................................................................................................................2

D/I Mux III Software Control .......................................................................................................................3

Network Communications Controller..........................................................................................................Error!

Bookmark not defined.

SNMP.........................................................................................................................................................4

Serial Line Internet Protocol (SLIP)............................................................................................................ 6

Gateway.....................................................................................................................................................7

Transmission Control..................................................................................................................................7

Transmission Channel Assignments ..........................................................................................................8

Maps...........................................................................................................................................................8

Timing and Clock Source ...........................................................................................................................9

Alarms and Monitoring................................................................................................................................9

Power Failure Alarm...................................................................................................................................10

Alarm LED Indicators, Alarm Cut-off, and Bypass......................................................................................10

Power Supply Failure Indicator LEDs.........................................................................................................10

Minor Alarm................................................................................................................................................10

Bypass........................................................................................................................................................10

Trunk Processing .......................................................................................................................................11

T1 Interfaces - CSUs..................................................................................................................................11

Lightning Protection....................................................................................................................................11

T1 Testing With the CSU............................................................................................................................11

Power Supplies...........................................................................................................................................12

D/I Mux III User Circuit Interfaces...............................................................................................................13

RING GENERATOR MODULE FOR D/I MUX III.........................................................................II

Remote Control with NCC............................................................................................................4

-48 Volt DC Power Supplies.........................................................................................................12

-24 Volt DC Power Supplies.........................................................................................................12

110 Volt AC Power Supply...........................................................................................................12

Circuit Features............................................................................................................................ 14

COMPONENT OVERVIEW 15

Shelves.......................................................................................................................................................17

D/I MUX III User’s Manual

Shelf Backplane Connectors........................................................................................................18

Common Equipment Units and Line Cards ................................................................................................19

Common Equipment...................................................................................................................................19

Common Control Unit...................................................................................................................19

CCU Circuit Description ...............................................................................................................21

Advanced Multiplexer Control Unit (AMCU).................................................................................22

AMCU Motherboard Circuit Description ....................................................................................... 22

AMCU Sub-Board Circuit Description...........................................................................................26

Strobe Units .................................................................................................................................30

Line Interface Units......................................................................................................................32

T1 Interface Units ......................................................................................................................... 34

Power Supplies............................................................................................................................35

Line Cards..................................................................................................................................................35

Data Line Cards...........................................................................................................................35

Voice Line Cards..........................................................................................................................36

Digital Program Line Cards..........................................................................................................36

MODES OF OPERATION 37

Channel Bank Operation............................................................................................................................37

Loop Timing .................................................................................................................................37

Local Timing.................................................................................................................................37

Drop-and-Insert Operation..........................................................................................................................38

Recovered Timing........................................................................................................................38

Dual Channel Bank Operation....................................................................................................

Loop Timing .................................................................................................................................39

Local Timing.................................................................................................................................39

................38

CHAPTER 2. APPLICATIONS 40

Channel Bank.............................................................................................................................................40

Point-to-Public Network................................................................................................................40

Point-to-Point Private Network.....................................................................................................41

Drop-and-Insert..........................................................................................................................................43

Sharing Switch and FXS Applications.......................................................................................... 43

Dropping Data - Polled Data Network ..........................................................................................43

Dual Channel Bank.....................................................................................................................................44

Voice, Video, and Special Services Networks.............................................................................. 44

CHAPTER 3. INSTALLATION 45

Equipment Location....................................................................................................................................45

Space Requirements....................................................................................................................45

Shelves.......................................................................................................................................................46

Access Requirements ..................................................................................................................46

Power Requirements and Capacity............................................................................................................46

-48 VDC Power Systems..............................................................................................................47

-24 V DC Power Systems.............................................................................................................47

110 VAC Power Systems.............................................................................................................47

Required Equipment for D/I Mux III Installation..........................................................................................47

Shelf Installation.........................................................................................................................................48

Rack and Cabinet Installation..................................................................................................

Desktop........................................................................................................................................49

.....48

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D/I MUX III User’s Manual

Wall Mounting ..............................................................................................................................50

System Cabling..........................................................................................................................................54

FCC Radio Frequency Emission Compliance.............................................................................................54

Power and Alarms......................................................................................................................................60

Talk Battery..................................................................................................................................60

DC Power.....................................................................................................................................60

AC Power.....................................................................................................................................61

Alarm Contacts.............................................................................................................................61

T1 Transmission Lines ...............................................................................................................................61

T1 Cabling Considerations...........................................................................................................63

Timing Sync I/O..........................................................................................................................................64

Slot 2 Synchronization (Optional)...............................................................................................................65

Event Switch...............................................................................................................................................66

Voice and Data Connections......................................................................................................................66

Voice or Data Jumpers.................................................................................................................66

Voice Circuits...............................................................................................................................67

Data Circuits...............................................................................................................................................73

Digital Program Channels ............................................................................................................74

Common Equipment and Line Card Installation .........................................................................................74

Electrostatic Precautions..............................................................................................................74

Safety Precautions.......................................................................................................................75

Installing Cards in Shelf......................................................................................................

Removing Cards From Shelf........................................................................................................75

Strobe Units .................................................................................................................................77

Common Control Unit...................................................................................................................78

Advanced Multiplexer Control Unit (AMCU).................................................................................79

Line Interface Units......................................................................................................................84

T1 Interfaces................................................................................................................................86

Power Supply.............................................................................................................................................90

Heat Considerations.....................................................................................................................90

-48 V DC Power Unit (P/N 30338-102 and 30338-902)................................................................93

110 V AC Power Unit..................................................................................................................................95

Smart 110 V AC Power Supply....................................................................................................97

Transmission Connection...........................................................................................................................99

Cable..........................................................................................................................................................99

Line Card Installation..................................................................................................................................100

System Power-Up and Initialization............................................................................................................100

Configuring the D/I Mux III System.............................................................................................................100

..........75

CHAPTER 4. CONFIGURATION AND OPERATION..............................................................................................101

Setup and Programming Order ..................................................................................................................103

Screen Display and Data Entry...................................................................................................................104

Obtaining System Access...........................................................................................................................105

AC - Accessing the CCU/D/I Mux III User Screen......................................................................................108

AMCU Configuration...................................................................................................................................109

CL - Copying Line Card Configuration........................................................................................................109

CM - Copying the Map Matrix.....................................................................................................................111

DA - Displaying Alarms...............................................................................................................................112

DC - Displaying Shelf Configuration...........................................................................................................113

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D/I MUX III User’s Manual

DD - Displaying Line Card Data Configuration ...........................................................................................114

DH - Displaying Alarm History....................................................................................................................115

DM - Displaying Map Matrix........................................................................................................................117

DN - Displaying the Current Working Map..................................................................................................119

DP - Displaying System Parameters ..........................................................................................................119

DS - Displaying Clock Source.....................................................................................................................120

DT - Displaying the Current Map Table......................................................................................................121

DV - Displaying Smart AC Power Supply Parameters................................................................................ 122

DW - Displaying the Current Password......................................................................................................123

EW - Erasing Passwords............................................................................................................................ 123

LO - Logging Off.........................................................................................................................................124

MC - Modifying the CCU - Downloading Code ...........................................................................................124

MG - Modifying/Setting the Gateway Address............................................................................................125

MI - Modifying/Setting the Local IP Address...............................................................................................126

ML - Modifying/Setting SLIP Parameters....................................................................................................127

MM - Modifying/Installing the Manager.......................................................................................................128

MP - Modifying/Installing an MCU Password..............................................................................................129

MS - Modifying/Installing the Subnet Mask.................................................................................................130

OD - Operate Diagnostics Menu ..................................................................................................

OL - Operate Line Card Diagnostics Menu.................................................................................................133

PM - FDL Monitor.......................................................................................................................................135

Q - Quit Command.....................................................................................................................................136

RM - Removing the Manager .....................................................................................................................136

RP - Removing/Erasing Passwords............................................................................................................137

SB - Setting the Error Rate.........................................................................................................................137

SC - Setting Shelf Configuration.................................................................................................................139

SL - Setting Line Card Configuration..........................................................................................................144

SM - Setting/Editing a Map Matrix..............................................................................................................145

SN - Setting the Working Map....................................................................................................................148

SO - Setting the Communications Configuration........................................................................................149

SP - Setting System Operation Parameters...............................................................................................149

SR - Setting the COM Port Data Rate........................................................................................................152

SS - Setting the Clock Source....................................................................................................................153

ST - Setting/Editing the Map Table.............................................................................................................154

SW - Setting/Installing CCU Passwords.....................................................................................................155

VM - Viewing Manager Configuration.........................................................................................................157

VN - Viewing Network Parameters.............................................................................................................157

VP - Viewing Passwords.............................................................................................................................158

VR - Viewing Software Revision Status..........................................................................................

ZA - Clearing Alarm Count .........................................................................................................................160

ZH - Clearing Alarm History........................................................................................................................160

..............132

............159

CHAPTER 5. DIAGNOSTICS 161

Test Records..............................................................................................................................................161

T1 Alarms...................................................................................................................................................162

Local Alarm..................................................................................................................................162

Yellow Alarm................................................................................................................................162

Carrier Group Alarm.....................................................................................................................162

Frame Alarm ................................................................................................................................162

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D/I MUX III User’s Manual

B7 Alarm......................................................................................................................................163

BPV Alarm ...................................................................................................................................163

0-DEN Alarm................................................................................................................................163

Loop Codes Alarms......................................................................................................................163

Alarm Contacts...........................................................................................................................................163

Alarm Dialout..............................................................................................................................................164

ACO Button..................................................................................................................................164

Bypass Button..............................................................................................................................164

Bypass........................................................................................................................................................164

Power-Up Sequence ..................................................................................................................................165

Troubleshooting..........................................................................................................................................165

System-Level Troubleshooting.....................................................................................................167

Board-Level Troubleshooting.......................................................................................................167

Common Equipment and Line Card Testing...............................................................................................168

Defective Units...........................................................................................................................................168

Line Interface Units (LIUs)............................................................................................................169

T1 Transmission Tests...............................................................................................................................171

T1 Interfaces ..............................................................................................................................................171

Single Channel Bank Mode..........................................................................................................175

Drop-and-Insert Mode Tests ........................................................................................................177

Software Controlled Loopback Tests.......................................................................................................... 178

Loopback Tests..........................................................................................................................................179

Channel Bank: Normal Operation ................................................................................................1

Channel Bank: Bypass.................................................................................................................180

Channel Bank: Line Loopback .....................................................................................................181

Channel Bank: Payload Loopback ...............................................................................................182

Drop-and-Insert: Normal Operation..............................................................................................183

Drop-and-Insert: Bypass ..............................................................................................................184

Drop-and-Insert: Line Loopback...................................................................................................185

Drop-and-Insert: Payload Loopback............................................................................................ 188

Dual Channel Bank: Normal Operation....................................................................................... 190

Dual Channel Bank: Bypass.........................................................................................................190

Dual Channel Bank: Line Loopback............................................................................................ 191

Dual Channel Bank: Payload Loopback......................................................................................194

Software Diagnostics..................................................................................................................................196

OL - Operate Line Card Diagnostics...........................................................................................................196

OD - Operate Diagnostics .......................................................................................................................... 197

Performance...............................................................................................................................................200

SB - Set Bit Error Rate Options..................................................................................................................201

Technical Assistance..................................................................................................................................201

D/I Mux III Messages..................................................................................................................................202

Alarm Reporting .........................................................................................................................................205

APPENDIX A. D/I MUX III SPECIFICATIONS........................................................................................

APPENDIX B. -24 VOLT SYSTEMS.......................................................................................................................213

Common Equipment...................................................................................................................................213

Voice Cards................................................................................................................................................213

APPENDIX C. - ACCESSORIES INSTALLATION...................................................................................................215

.................208

D/I MUX III User’s Manual

Card Extender............................................................................................................................................215

External AC Power Supply.........................................................................................................................215

Installing the External AC Power Supply......................................................................................215

Ringing Generator......................................................................................................................................216

Installing the Ringing Generator...................................................................................................216

APPENDIX D. PRECONFIGURED MAPS..............................................................................................................218

Strobe Option Switch #1 - 24-Card Slots: 64 Kbps per Slot........................................................................219

Strobe Option Switch #2 - 12-Card Slots: Two 64 Kbps per Slot.............................................................220

Strobe Option Switch #3 - 12-Card Slots: 128 Kbps per Slot......................................................................221

Strobe Option Switch: #4 - 8-Card Slots: 192 Kbps per Slot.......................................................................221

Strobe Option Switch #5 - 6-Card Slots: 256 Kbps per Slot........................................................................222

Strobe Option Switch #6 - 4-Card Slots: 384 Kbps per Slot........................................................................222

Strobe Option Switch #7 - 3-Card Slots: 512 Kbps per Slot........................................................................222

Strobe Option Switch #8 - 1-Card Slot: 1.536 Kbps per Slot......................................................................222

APPENDIX E. SNMP 224

APPENDIX F. MIB II AND DS1 MIB GROUP NAMES AND OBJECTS.................................................................. 226

APPENDIX G. MODEM INTERFACES...................................................................................................................246

General Modem Operation.........................................................................................................................246

Hayes Command Set .................................................................................................................................246

Special Coastcom Characters....................................................................................................................246

NCC Characters...........................................................................................................................246

D/I Mux III Characters..................................................................................................................247

DXC II Characters........................................................................................................................247

Hayes 1200 and 1200B Command Sets ....................................................................................................250

Smartmodem 2400/2400B Command Set..................................................................................................251

V-Series Commands ..................................................................................................................................254

Modem Considerations...............................................................................................................................257

Line Noise.................................................................................................................................... 257

Command Timing.........................................................................................................................257

Modem-To-Modem Sequencing...................................................................................................257

Modem Control Lines...................................................................................................................257

Dial-Out Call Processing ............................................................................................................................ 257

Modems and the NCC System.....................................................................................................258

Making Connection ......................................................................................................................258

Processing Messages..................................................................................................................259

Terminating Connection............................................................................................................... 260

Modems and D/I Mux III or DXC II Systems.................................................................................261

Making Connection ......................................................................................................................261

Connection Stabilization...............................................................................................................262

Processing Messages............................................................................................................

......262

Terminating Connection............................................................................................................... 262

APPENDIX H. SET REPORT OPTIONS................................................................................................................. 265

Setting Communications in Terminal Mode With Inaudible Terminal Alarm Reporting............................266

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 266

Setting Communications in Terminal Mode With Modem Dial-Out.........................................................268

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 268

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D/I MUX III User’s Manual

Setting Communications in Terminal Mode With Alarm Reporting Off .................................................... 270

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 270

Setting Communications in MML Mode With Modem Dial-Out Enabled..................................................272

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 272

Setting Communications in MML Mode With Modem Dial-Out Disabled.................................................274

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 274

Displaying Modem and Port Expander Information ....................................................................................276

Feature Group 6.0/6.2 Screen Changes ...................................................................................... 277

Configuring the Modem................................................................................................................278

Displaying New Modem Configuration ......................................................................................... 280

Configuring the Port Expander.....................................................................................................281

Displaying New Port Expander Configuration...............................................................................283

Quitting Alarm Reporting Configuration........................................................................................ 284

APPENDIX I. TRAPS AND MODEM DIAL OUT CONFIGURATION...................................................................... 286

AMCU New Screens...................................................................................................................................286

HARDWARE WARRANTY AND 90-DAY SUPPORT AGREEMENT....................................................................... 309

xvii

Chapter 1. System Overview and Modes of Operation

Chapter 1. SYSTEM OVERVIEW AND MODES OF OPERATION

This manual details the Coastcom D/I Mux III multiplexer for use with T1 connections. Users unfamiliar with T1 technology are encouraged to refer to commercially published material on T1 for more information, however the basic concepts of T1 are relatively simple. Essentially, a T1 line is a 4 wire, high speed phone line capable of carrying many individual phone connections, analogous to a large conduit.

The T1 network facilitates high speed transmission of large volumes of digitized voice and data signals over extended distances. T1 standards provide transmission of up to twenty-four 64 Kbps channels (DS0s) sequentially.

A multiplexer is a device that takes voice and data inputs from various types of telecommunication devices and converts them into a data stream which is sent over the T1 line. This technology is called multiplexing, and it allows telecomm users to send and receive a large volume of traffic over wide areas efficiently, while still enjoying direct connections to individual phones, modems, and other similar equipment. The T1 line constitutes what is referred to as a DS1 channel. The individual channels that make up the DS1 are referred to as DS0s.

D/I Mux III Capabilities

Coastcom's D/I Mux III family of intelligent T1 multiplexers offers fully programmable, easy to use software-controlled voice and data multiplexing.

One or two T1 digital transmission systems are easily accessed with a D/I Mux III. Voice, data, and special service circuits are all available within one compact system. The D/I Mux III supplies 48 DS0 transmission channels, and with 5-port Subrate Data Multiplexer (SDM) channel cards, up to 120 data circuits can be accessed in a single system.

All of the D/I Mux III card slots can be mapped to any T1 span. Drop-and-insert users can also reuse DS0s that are dropped from one T1 span (for example, the T1-1 span) by inserting them in the opposite T1 span (T1-2).

D/I Mux III multiplexers can be placed in several modes of operation without changing hardware. The D/I Mux III can be configured for channel bank, drop-and-insert, dual channel bank, or optionally, Automatic Loop Protection Switching (ALPS™) operation. ALPS is designed to maintain communications after a T1 line break, or system failure; and with system redundancy, ALPS operation requires special common equipment hardware. With ALPS hardware all modes of operation are accessible. For more details on ALPS see the ALPS User's Manual.

The D/I Mux III meets AT&T's T1 compatibility specifications for electrical performance, and for alarm and restoration sequences (AT&T Publications 43801 and 62411).

Chapter 1. System Overview and Modes of Operation

D/I Mux III Functions

The D/I Mux III can be configured to communicate over T1-1 or T1-2 (up or down the T1 span), or over both. As a drop-and-insert system, the D/I Mux III drops (extracts and distributes) the channel contents from either or both of the T1 Receive (Rx) signals, and makes them available to external devices. It then inserts (picks up and adds) the channel contents from these devices to either or both of the T1 Transmit (Tx) signals.

The D/I Mux III provides an economical means of connecting to remote external devices such as telephones, modems, computers, terminal controllers, PBX units, etc. The D/I Mux III, in all modes of operation, supports local and remote control functions, networking management, transmission quality, and failure protection.

D/I Mux III Features

A D/I Mux III system includes the following features:

• A multi-tasking microprocessor for rapid reconfiguration and quick response to changing network

conditions

• Software control and configuration

• Automatic alarm notification

• Eight preconfigured maps for easy reconfiguration of the DS0 transmission channels

• Time, event, manual, and alarm control of maps (alarm map control requires Feature Group X.4 or

higher)

• Selectable timing sources

• Real-time alarm reporting and recording

• Alarm LED indicators

• External alarm contacts

• T1 equalization

• Optional T1 test jacks

• Lightning protection

• AC or DC power supplies

• Optional redundant DC power supplies

• Internal ringing generator (with AC power supply systems)

• Voice, data, and subrate data circuits

• High fidelity audio circuits

• Circuit level loopbacks and testing

• Optional integrated Channel Service Unit (CSU)

• Optional Simple Network Management Protocol (SNMP) to streamline network management

• With SNMP, Serial Line Internet Protocol (SLIP) feature allowing communication between network

manager and a far-end D/I Mux that is not connected directly via a LAN, or router

• With SNMP, a gateway feature enabling message transfer between different networks

• With AIM-Net, a network management system

Chapter 1. System Overview and Modes of Operation

D/I Mux III Software Control

As depicted in Figure 1-1, the D/I Mux III can be controlled in one of the following ways:

• Locally, through use of an asynchronous ASCII terminal

• Via a personal computer with terminal emulation software

• Through the use of SNMP software command options, (requires AMCU card option)

Most D/I Mux III configuration and diagnostic functions (transmission channel mapping, shelf operating modes, T1 formats, clock sources, alarm generation and reporting, as well as password access) are under software control. Software also controls the configuration of intelligent channel cards.

Figure 1-1. Software Control

AIM-NET EMS

Coastcom’s AIM-Net is a Windows-based enhanced Element Management System (EMS) designed to simplify the construction and mapping of complex voice and data networks. This unique software management tool was designed in support of our AIM and D/I Mux III product lines, empowering the user to set up, configure, view, and manage an entire mixed network from a single location. Simple point and click navigation alleviates the need for highly trained technicians to manage your networks and reduces costly travel time to remote sites for maintenance. (For D/I Mux, requires an AMCU controller card). (See separate AIM-Net User’s Manual for further features and functionality).

AIM-Net Features:

• Point and click mapping of once complex voice and data networks

• The unique ability to automatically select routing

• Maintains a comprehensive record of all equipment and software within the network

• Reports critical feature card information from throughout the network

• Provides a platform for network and inventory management

• The ability to export network and node information to any Open Database Connectivity (ODBC)

where customized management reports can be generated

• Allows for the design and simulated connection of networks in a virtual environment for review before taking the network live.

Chapter 1. System Overview and Modes of Operation

Figure 1-2. AMCU System Network

Remote Control with AMCU

Remote control of the D/I Mux III system is made possible through the use of a modem connection to the D/I Mux III COM port (also referred to as the control port). A terminal and modem are connected at the user site, and call up the remote system using terminal emulation software. Figure 1-3 illustrates remote control through use of AMCU system software.

Figure 1-3. System Remote Control Via AMCU

SNMP

Advances in internetworking during the 1980s forced the definition of a new network management standard, creating the Simple Network Management Protocol (SNMP), the most widely used market standard to date. The optional Advanced Multiplexer Control Unit (AMCU) provides the SNMP option by adding networking capability to an enhanced, modular version of the CCU card.

SNMP provides a set of features that allows management of T1 devices by more than one SNMP manager from anywhere in an Ethernet 10Base-T Local Area Network (LAN), as depicted in Figure 1-4. Coastcom’s SNMP products communicate with SNMP managers from vendors whose products comply with Request for Comment (RFC) 1157.

Chapter 1. System Overview and Modes of Operation

Figure 1-4. SNMP Helps Manage Network Elements via LANs Close at Hand or Over Long Distances

While most of the connectivity and interoperability issues in networking have been resolved, it is still vital that network devices be monitored, network performance checked, and that network problems be remotely diagnosed and corrected. Network management achieves these goals, and SNMP is the most widely accepted market standard for Transmission Control Protocol-Internet Protocol (TCP/IP)-based environments.

Coastcom implements SNMP using a powerful AMCU that offers the following features:

• Native SNMP that eliminates the need for proxy hardware

• Support of Management Information Base 2 (MIB2) and DS1 MIB

• Intel i960 RISC processor-based AMCU speeds data processing

• Local serial interface allows programming of the unit through use of a dumb terminal, or via a PC with

terminal emulation

• An Ethernet 10Base-T port offering Telnet VT-100, or VT-220 terminal emulation over a LAN

• Downloadable code support via a Personal Computer Memory Card International Association

(PCMCIA ) card.

Chapter 1. System Overview and Modes of Operation

Serial Line Internet Protocol (SLIP)

A D/I Mux III with the SNMP option will usually be connected through a Local Area Network (LAN) to one or more SNMP managers. The network connection can be made either through an Ethernet 10Base-T, or serial port connection.

A direct Ethernet connection is preferred. This is accomplished by connecting the 10Base-T jack, located on the AMCU front panel, to a hub or other suitable network device with an appropriate cable.

If a direct Ethernet connection is not feasible, the Serial Line Internet Protocol (SLIP) connection can be used. A serial connection is accomplished by linking the SLIP/PPP jack on the AMCU front panel to a router or other suitable network device by any means appropriate for a serial connection. The router must be configured for a SLIP connection.

While a serial network connection is significantly slower than an Ethernet connection, it is more flexible. The serial link can be carried by a D/I Mux Subrate Data Multiplexer (SDM) channel, or in any of a number of other ways in addition to a direct cable connection.

While it is possible to use both the Ethernet and SLIP/PPP ports simultaneously, this is usually not done because the AMCU card has no internal bridging or routing capabilities. Additionally, the SLIP feature does not currently support the use of modems.

Figure 1-5 depicts SLIP operation with a network manager sending message traffic through a router, via RS-232 cabling, and through an SDM or other transport medium, to the SLIP COM port of a far-end D/I Mux.

Figure 1-5. Serial Line Internet Protocol (SLIP) Connection

Chapter 1. System Overview and Modes of Operation

Gateway

The AMCU makes special provision for the case where it is connected to a network that is linked to other networks by a Gateway (special router). In this case, messages to the manager must be addressed to pass through the Gateway, and the address of the Gateway must be known to the AMCU. If the AMCU is configured with a “default Gateway address,” messages to SNMP managers with IP Addresses not on the same network as the AMCU will not be properly addressed and forwarded by the indicated Gateway.

Figure 1-6 depicts a typical Gateway connection across two networks with different IP Addresses.

Figure 1-6. Gateway Connection

Transmission Control

T1 equipment operates at 1.544 Mbps, which is the product of the twenty-four 64 Kbps channels, plus 8 Kbps for overhead. This is known as the DS-1 rate and a T1 facility is known as a DS-1 facility. The common (inter-exchange) carriers (e.g., AT&T, MCI, SPRINT, etc.) divide the DS-1 signal into the 24 64Kbps DS0 channels, using this signal rate as a standard digital communications interconnection method within North America. Local Exchange carriers, such as Pacific Bell and Southwest Bell, etc., also offer this service for private networks.

The T1 signal is based upon what are known as DS1 Frame, and DS1 Extended Super Frame (ESF). Simply defined, the DS 1 ESF scheme is as follows:

• DS0 Data Signal - Unframed, continuous bit stream, at a rate of 64 Kbps

• DS0 Octet - Eight consecutive bit portions comprising DS0 data signal

• DS1 Frame - Twenty-four DS0 octets, preceded by one framing bit

• DS1 ESF - Twenty-four consecutive DS1 frames

• DS1 Data Signal - Continuous stream of DS1 frames, at the standard DS1 data rate of 1.544 Mbps

The DS1 signal consists of 24 time slots, each of which transmits and/or receives one DS0 within the multiplexer. Some external signals are capable of more or less than one DS0, in which case several DS0s might be required for one type of signal, while in other cases several signals might occupy just one DS0. This determination is based upon the application, and number of channel cards included in the system. DS0 time slots are user-configurable. Installing a channel card does not automatically assign its transmission path. Time slots and physical card slots are independent of one another, and the transmission path must be mapped.

Chapter 1. System Overview and Modes of Operation

D/I Mux III line card circuits transmit and receive information over user-assigned (mapped) DS0 channels as data or voice. The map assignments are user programmed and the information is recorded in a line card map.

Transmission Channel Assignments

A line card circuit which is not assigned a DS0 (T1 transmission channel) can be configured for operation, but will not perform its transmission function until a DS0 has been assigned. Transmission direction is configured using software commands that specify the mode of operation, the port, and applicable timing options. Typically, the T1-1 port is automatically “on”.

The signaling type for a DS0 channel, whether voice or data, is designated in the DS0 assignment map. When a DS0 is mapped to an intelligent line card it will allocate the correct voice or data signaling type automatically. A hardware-configured card, or empty card slot, signaling type must be entered manually in the DS0 assignment map. DS0 designations are listed in the maps as data, voice, transmit (T), receive (R), through or unused (X).

When DS0 information passes through the multiplexer without being processed, it is referred to as a through DS0.

Unused DS0s are those not assigned to a line card circuit.

Maps

Mapping is the process of defining which of the line card circuits use which of the 24 DS0 transmission time slots. Mapping is controlled by software stored in the Common Control Unit (CCU). Up to seven maps can be stored, with the map currently operating called the working map.

A map change alters the circuit-to-time-slot assignments. By changing to a new working map, the system is able to change time slot assignments without causing data errors on unchanged DS0s.

Maps are set to start in response to user-specified times, an event, an alarm, or a manual keyboard command.

Time triggered maps reconfigure the multiplexer automatically at a specified time. Voice circuits can be decreased, and high-speed data capacity can be increased for evening or weekend operation. This allows data backups and file transfers to process more quickly when voice traffic is low.

Event triggered maps are switched on by an event, such as a disaster situation or a demand requirement, to meet unscheduled network traffic rerouting. The event is triggered when a physical contact at the back of the multiplexer is grounded.

Alarm triggered maps are switched on by one of three alarm conditions: Bit Error Rate (BER) Alarm, Red Alarm, or Yellow Alarm.

Manual maps are switched on only when a keyboard command is entered. Use a manual map when only one map is required for the network, or to reconfigure a map. The time, event, and alarm maps can also be switched on manually for testing or special requirements.

The D/I Mux III has eight preconfigured maps of commonly used configurations for setup without a terminal. See Appendix D. Preconfigured Maps, for details.

Chapter 1. System Overview and Modes of Operation

Timing and Clock Source

Transmit clocks for the T1-1 and T1-2 transmission ports are derived from the sources illustrated in Table 1-1 below.

Table 1-1. Clock and Timing Source

Clock Source Timing Source

T1-1/T1-2 Recovered Loop

Internal T1 Local

External Local

T1-2 Local

Slot-2 Local

With loop timing, the D/I Mux III in channel bank operation is synchronized to the T1 network. Clocks recovered from the T1 network are used to create the T1 transmit clocks.

In local timing, the clock source for the T1 outputs is derived from the D/I Mux III internal 1.544 MHz (Stratum IV) oscillator. This oscillator can either run freely, or be synchronized to an external clock.

In the drop-and-insert or dual channel bank loop timing mode, the D/I Mux III recovers clock from T1-1, and uses this to create the T1-2 transmit clock. The T1-2 recovered clock is used to create the T1-1 transmit clock.

Alarms and Monitoring

Alarm detection is provided for both the T1-1 and T1-2 transmission lines. Common Bell System alarms, as follows, are supported:

• Local alarm

• Remote alarm

• Carrier Group Alarm (CGA)

Audible, visual, and minor alarm contacts are provided. The audible and visual contacts indicate major alarms. A major alarm indicates a service-affecting problem that requires maintenance action. Visual contacts indicate a minor alarm, which is not service-affecting. However, it does require maintenance action.

Alarms are indicated by front panel Light Emitting Diodes (LEDs), and are reported by the closing of alarm relay contacts. Alarms are reported to both the CCU and AMCU.

Loss of frame synchronization, or loss of the receive signal, activates a local alarm. If the condition persists for 2.5 seconds, the local terminal sends a yellow alarm to the remote end. The direction of yellow alarm transmission is user-configurable to either T1-1, T1-2, or both.

If a local alarm exists for a user-defined period, or if a remote alarm is received, a Carrier Group Alarm (CGA) is generated to initiate trunk processing in the D/I Mux III. Trunk processing “busies out” (removes) circuits in an orderly fashion.

Chapter 1. System Overview and Modes of Operation

There are many other alarms in the D/I Mux III system. Alarms are rated as major, minor, and informational. Details of the various alarms are described in Chapter 5. Diagnostics.

Power Failure Alarm

All of the alarm contacts on the D/I Mux III are open during non-alarm conditions. Power failure, or removing a power supply (or both supplies if redundant DC units are installed), will cause the visual and audible alarm contacts to close.

Alarm LED Indicators, Alarm Cut-off, and Bypass

The D/I Mux III has Light Emitting Diode (LED) indicators for alarms, alarm cut-off, and bypass. After an alarm has occurred, an alarm cut-off (ACO) button, or corresponding software selection, allows the user to turn off the audible alarm relay. The bypass (BYP) button, or software bypass, allows the D/I Mux III to be bypassed. The bypass button only activates when there is a major alarm. Bypass is only possible in drop-and-insert or ALPS mode with a Dual Digital Signal CrossConnect (DSX-1) interface during a power failure. (A Dual DSX-1 Interface will cause the shelf to go into bypass immediately if it loses power.) In redundant DC power systems, both power supplies must fail at any given output before the system enters the bypass mode.

Power Supply Failure Indicator LEDs

The red failure indicator will turn on if any power supply-regulated voltage is out of tolerance, or if fuses F1, F2, or F3 are blown on, or removed from the -48 V DC power supplies.

In redundant DC power systems, the system software indicates if one power supply has failed. This allows insertion and removal of either power supply without interrupting service unless both power supplies are being used to provide power to the channel cards.

Minor Alarm

The minor alarm relay closes for minor alarm reporting. These pins are accessible on the D/I Mux III backplane, at the contacts labeled MNR. The minor alarm can be activated by the system reporting a minor alarm, such as a Cyclic Redundancy Code (CRC) error, or redundant power supply failure. (Refer to Chapter 5. Diagnostics for more information on alarms.)

Bypass

When the D/I Mux III is configured for drop-and-insert operation, bypass causes the T1-1 span to be connected to the T1-2 span, bypassing the D/I Mux III so that “through T1” is uninterrupted.

The bypass operation can occur automatically, through software selection, or through manipulation of front panel switches.

When a Dual Digital Signal Cross-Connect (DSX-1) Interface is installed in a D/I Mux III, bypass automatically occurs when any of the common equipment is removed, or if an out-of-tolerance voltage is supplied to the system (a brownout occurs). Dual Channel Service Unit (CSU) interfaces do not go into bypass because protected DC power is used for their operation.

During an alarm condition, bypass can be selected using the bypass switch on the CCU, or AMCU, front panel. Before bypass can be activated, the alarm condition must be acknowledged by selecting Alarm Cut-off (ACO) via software, or at the front panel. Bypass can be software-selected at any time.

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Coastcom D/I Mux III System User Manual

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