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DL3800EInverse MultiplexerUser’s GuidePart 098-30380-01 Rev FJuly 9, 2001

x DL3800E Inverse Multiplexer User’s Guide — July 9, 2001Front Panel LEDs 5-3Access Levels And Protected Mode 5-4Power Up And Reset 5-5Top Menu 5-5Sel

5-12 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015TEST MENUThe TEST MENU is used to activate network loopbacks and DTE loopbacks. The TEST

Front Panel Interface 5-135NOTE: A menu item will appear only for those E1 network interfaces. installed.DTE TESTSNET 2 TESTSNET 3 TESTSNET 4 TESTSENT

5-14 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015DTE TESTSOnly one loopback can be initiated through the DTE TESTS MENU, a bi-directional

Front Panel Interface 5-155Network Tests (1-8)Three NETWORK TESTS can be performed through this menu: PAYLOAD (PAYLD) LOOPBACK, LINE LOOPBACK and LOCA

5-16 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Line LoopbackThe Lineloopback is used to verify the operation of the E1 network connectio

Front Panel Interface 5-175CONFIGURATION MENUThe CONFIGURATION MENU is used to back up the database and to view and change the unit and Comm Port Conf

5-18 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Table 5-4 CONFIGURATION MENU ItemsMenu DefinitionBackup Database Used to manually backup

Front Panel Interface 5-195Node ConfigurationThe NODE CONFIG MENU allows you to configure the NODE ID, NODE NUMBER, DATE & TIME and *NODE COMM POR

5-20 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015The NODE CONFIGURATION MENU is used to configure various parameters of the DL3800E, inclu

Front Panel Interface 5-215Table 5-5 NODE CONFIGURATION MENU ItemsParameter DefinitionUnit ID The Unit ID is an alphanumeric designation up to 16 char

xiAppendix A, Specifications A-1E1 Network Interface A-1External Clock Interface A-1DTE Interface A-2COMM PORT A-2NMS Port (SNMP) A-2Front Panel A-3D

5-22 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Local Terminal XON/XOFF With the Flow Control feature On, the terminal can request that t

Front Panel Interface 5-235Note that both the NODE HW (HARDWARE) REV and the NODE SW (SOFTWARE) REV are set at the factory and cannot be changed.PARIT

5-24 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015DTE Configuration MenuThis menu allows you to set various configurable items for the DTE

Front Panel Interface 5-255

5-26 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Network ConfigThe NETWORK CONFIG MENU allows you to change various configurable items com

Front Panel Interface 5-275

5-28 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015NET N ConfigThe NET N CONFIG MENU allows you to change various configurable items common

Front Panel Interface 5-295Pressing Enter when NET THRESHOLDS appears in the display screen will start the menu and allow you to scroll, using the dow

5-30 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015To turn a Major Alarm ON or OFF, use the UP and DOWN ARROW buttons to get the specific al

6-16Diagnostics 6EQUIPMENT RETURN AND REPAIRIf faulty equipment is suspected, perform the tests in this section. If, after performing these tests, the

xii DL3800E Inverse Multiplexer User’s Guide — July 9, 2001Index I-1

6-2 DL3800E Inverse Multiplex User’s Guide — July 9, 20016Figure 6-1 TESTS MENU DTE/Network Loopback Test Use the DTE/NETWORK Loopback test to verify

Diagnostics 6-36Payload Loopback and Line Loopback TestsUse the PAYLOAD Loopback and LINE Loopback tests to verify the proper operation of the DL3800E

6-4 DL3800E Inverse Multiplex User’s Guide — July 9, 20016accomplished through DTE loopback and a self test. Testing for the proper functioning of t

Diagnostics 6-56The NETWORK E1 port LED’s on the DL3800E unit never illuminate.Make sure the E1 cable from your service provider is connected to the D

6-6 DL3800E Inverse Multiplex User’s Guide — July 9, 20016The NETWORK E1 LEDs on an DL3800E unit are flashing green.Make sure a valid DTE device is co

Diagnostics 6-76The connected DTE device shows intermittent errors.Run a DTE/NET Loopback to verify the physical connection between the local DTE devi

6-8 DL3800E Inverse Multiplex User’s Guide — July 9, 20016You cannot access the DL3800E unit from a terminal.The terminal must be running a VT100 or c

A-1ASpecifications AE1 NETWORK INTERFACEEXTERNAL CLOCK INTERFACEParameter SettingInterface Type E1Number of Ports 2, 4, 6 or 8Framing Formats CRC4 (En

A-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001ADTE INTERFACECOMM PORT NMS PORT (SNMP)Item InterfaceElectrical Interface HSSI or V.35/RS-4

Specifications A-3AFRONT PANELDIAGNOSTICSPOWERENVIRONMENTALItem InterfaceDisplay 16 Character AlphanumericKey Pad Four KeysDTE Status LEDs TD, RD, R

xiiiList of FiguresFigure 1-1 DL3800E Inverse Multiplexer (front panel) 1-1Figure 2-1 DL3800E Inverse Multiplexer 2-1Figure 2-2 Typical Application fo

A-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001APHYSICAL /CONNECTORSEXTERNAL ALARM CONTACTSStorage Temperature -20oC to 60oCRelative Humid

Specifications A-5AThe External alarms are used to turn on a Bell or Light to indicate that an alarm has occurred on the DL3800E. Either the Major, Mi

A-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001A

B-1BPinouts BTERMINAL CONNECTIONDCE CONNECTORSTable B-1 COMM and NMS Port Pin AssignmentsSIGNAL DIRECTION PINReceive Data To Terminal 2 RD Send Data

B-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001BCHANNEL 1 DATA CABLE PIN ASSIGNMENTSThe pin assignments for the V.35, M-34 to DB-25 DTE ca

Pinouts B-3BTable B-4 EIA-530, DB-25 to DB-25 DCE Connector Pin AssignmentsDB-25 DB-25 SIGNAL17352411SCTE725419RTS246163RD224142TD1118625DSR278135CTS1

B-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001BDB-25 to DC-37 Data Port Cable Pin AssignmentsThe pin assignments for the DB-25 to DC-37 D

Pinouts B-5BCOMMUNICATION PORT PIN ASSIGNMENTSRS-449, DC-37 to DB-25 DCE Cable Pin Assignments Table B-6 describes the RS-449, DC-37 to DB-25 DCE cabl

B-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001BE1 NETWORK PIN ASSIGNMENTSThe network connector is a DA-15 connector. The assignments for

Pinouts B-7BX.21 TO DB-25 CABLE PINOUTSEXTERNAL CLOCK CONNECTOR PIN ASSIGNMENTSA DE-9 connector is provided on the DL3800E unit rear panel for connect

xivFigure 4-12 DTE CONFIGURATION MENU (HSSI) 4-22Figure 4-13 Network Configuration Screen 4-26Figure 4-14 Network Thresholds Configuration 4-29Figure

B-8 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001BPer RS-422 requirements, the receiver has an input sensitivity of 200 mV over the input vo

Pinouts B-9BALARM PINOUTPin Assignments for the Alarm connector are as follows:Table B-11 Alarm PinoutMaj - MajorMin - MinorNC - Normally Closed (unle

B-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001BDC POWER CONNECTIONSFigure B-1 DC Power ConnectionsDTE CLOCK RATESTable B-12 DTE Clock Ra

C-1CFactory Default Settings CTable C-1 Unit SettingsUnit SettingALARM ENABLE DisabledAUTOMATIC BACKUP 5 minutes after each database changeFRONT PANEL

C-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001CTable C-3 Network SettingsNetwork SettingALARM MaskACTIVE/RESTORE MODE Never UseFRAME CRC4

Factory Default Settings C-3CBITS & PARITY 8 bits, No paritySTOP BITS 2Table C-6 Test SettingsTests SettingALL LOOPBACKS & TESTS OffTable C-5

C-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001C

G-1GGlossary GAABAMA designation for 22-gauge, 110-ohm, plastic-insulated, twisted-pair Western Electric cable normally used in central offices.AIS (A

G-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GBB8ZS (Bipolar 8 Zero Substitution)A technique used to accommodate the ones density requir

Glossary G-3GbroadbandServices or interfaces that operate above the T1 data rate, typically at NxT1, T3, SONET, or ATM speeds.BPV (Bipolar Violation)O

xvList of TablesTable 4-1 Main Menu 4-4 Table 4-2 3800E Alarm Descriptions 4-5 Table 4-3 NET Statistics Items 4-13Table 4-4 Alarm Level 4-16Table

G-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GconnectorA physical interface, such as DB-15 or RS-232-C, typically with male or female co

Glossary G-5Gdata linkAny serial data communication transmission path, generally between two adjacent nodes or devices and without any intermediate sw

G-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GDSU LoopbackA DSU loopback is intended to include as much of the customer data communicati

Glossary G-7GequalizationThe spacing and operation of amplifiers so that the gain provided by the amplifier, per transmission frequency, coincides wit

G-8 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001Gframe relayA high-speed packet switching protocol used for wide area networks (WANs); fast

Glossary G-9GLOF (Loss of Frame)Occurs when a received digital signal loses frame synchronization. LOFC (Loss of Frame Count)A count of declared Loss

G-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GmultidropA communications arrangement where multiple devices share a common transmission

Glossary G-11GpolarityAny condition where there are two opposing charges, such as positive and negative.portThe physical point of access into a comput

G-12 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GRS232-CAn EIA specified physical interface, with associated electrical signaling, between

Glossary G-13GSG (Signal Ground)A signal from DTE to DSU/CSU.simplex currentOne way transmission used by Telco to provide power to repeaters. SLIP

xvi DL3800E Inverse Multiplexer User’s Guide —July 9, 2001Table B-1 COMM and NMS Port Pin Assignments B-1 Table B-2 HSSI DCE Connector Pin Assignments

G-14 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001GT-CarrierA time-division, multiplexed digital transmission facility, usually operating at

I-1IIndex IAAlarm Level 4-16Alarms and Status 4-5Application 2-3Audience xviiAWG tray cable 3-3BButton Overview 5-1Ccableinstalling DC power 3-4cable

I-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001INNET (1-8) Statistics 5-9NET (1-8) Status 5-9NET N Config 5-28NET STATISTICS MENU Informat

xviiPrefaceThe DL3800E Inverse Multiplexer User’s Guide provides the information you need to install, test, operate, and manage the DL3800E Inverse Mu

xviii DL3800E Inverse Multiplexer User’s Guide — July 9, 2001CONVENTIONSThis section describes the formats used to differentiate specific types of inf

Preface xixTypographyQuick Eagle Networks manuals delineate the names of files, commands, and actions by using the fonts and typefaces described in th

COPYRIGHT AND TRADEMARKSCopyright © 2001, Quick Eagle NetworksWorld copyright reserved. No part of this publication may be stored in a retrieval syste

xx DL3800E Inverse Multiplexer User’s Guide — July 9, 2001QUICK EAGLE NETWORKS TECHNICAL SUPPORTIf you should experience difficulty with the setup and

Preface xxiSEND US YOUR COMMENTSPlease let us know if this user guide manual meets your requirements.Does the manual answer your questions?Is the manu

xxii DL3800E Inverse Multiplexer User’s Guide — July 9, 2001

1-11Quick Install Guide 1PURPOSEThis chapter is a quick reference for the setup and configuration of the DL3800E Inverse Multiplexer (see Figure 1-1).

1-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 20011SetupTerminal Log OnConnect your terminal to the COMM port on the back of the DL3800E unit

Quick Install Guide 1-31Network ConfigurationSet up a port for each E1 line you plan to use. Set Alarm to Report. Set ACTICVE/RESTORE MODE to Use w/au

1-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 20011

2-12Introduction 2SYSTEM OVERVIEWThe DL3800E Inverse Multiplexer bridges the gap between E1 and E3 data services by providing E1 multiplexing of multi

2-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 20012The DL3800E unit features an automatic rate fallback in the event of a failing E1 circuit.

Introduction 2-32System BenefitsThe numerous features of the DL3800E unit provide you with many benefits:• Reliable, full performance access to E1 net

Buyer's exclusive remedy, and Quick Eagle Networks' total liability, for any and all losses and damages arising out of any cause whatsoever

2-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 20012FUNCTIONAL DESCRIPTIONThe base DL3800E unit configuration consists of a motherboard with t

Introduction 2-52When the incoming signal is framed on the inverse mux frame, the framer will start loading its Dual Port RAM. The address to the Dual

2-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 20012Figure 2-3 DL3800E Unit Functional SchematicOverhead FunctionsThe overhead functions consi

3-13Installation 3INSTALLATION1. Unpack and inspect the DL3800E unit for damage that might have occurred during shipment. If necessary, wipe off the e

3-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 200138. Configure Unit See “Unit Configuration” on page 4-17 (ASCII terminal)a. Configure COMM

Installation 3-33POWER CABLES AND CONNECTIONSThe DL3800E unit can be ordered with an AC or DC power supply.AC Power ConnectionAn AC power cord is supp

3-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 200134. Connect the ground (+) wire to the + terminal in the same way.5. Connect the frame grou

Installation 3-53E1 NETWORK CONNECTIONThe eight port connector can be either a DB-9, DB-15, or BNC. The connectors are located on the DL3800E unit bac

3-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 20013Direct ConnectionFor direct connection, using the appropriate DE-9 cable, connect the ASCI

Installation 3-73Daisy Chaining Multiple DL3800E units can be daisy-chained together through the Terminal Port to provide centralized network monitori

RIGHTS TO SOFTWAREQuick Eagle Network ("QEN") software products are proprietary to QEN and shall remain the property of QEN. Other than the

3-8 DL3800E Inverse Multiplexer User’s Guide — July 9, 20013

4-14Terminal Interface 4LOG IN/LOG OFFEach DL3800E unit is equipped with an integrated RS-232 ASCII user interface that can be accessed through the CO

4-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 200144. To log on to another DL3800E unit on the same daisy chain, simply type Ctrl-X, followe

Terminal Interface 4-34The next two lines in the menu, which are always highlighted, represent the Status Bar. The first line of the Status Bar displa

4-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014INVERSE MULTIPLEXER MAIN MENU COMMANDSWhen a DL3800E unit is first powered up, the Main Me

Terminal Interface 4-54ALARMS AND STATUSThe ALARMS AND STATUS MENU is a view-only screen that allows you to review the current ALARMS AND STATUS items

4-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014AIS DET Alarm Indication Signal Detected — Net Port detects an unframed continuous stream

Terminal Interface 4-74SES Threshold Net Port has exceeded the Severely Errored Second Threshold.UAS Threshold Net Port has exceeded the Unavailable S

4-8 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014ROM Checksum Fail This occurs if the checksum for the code image stored in ROM does not ma

Terminal Interface 4-94DTE Loss The signal indicating DTE presence has been lost.DTR On The V.35 DTR signals is present.RTS On The V.35 RTS signal is

Malfunction of the equipment: In the event this equipment should fail to operate properly, disconnect the unit from the telephone line. Try using anot

4-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014NOTE: Status display will read ACTIVE, if the DL3800E unit is in Inverse Mux mode and re

Terminal Interface 4-114StatisticsThis menu allows you to access the performance STATISTICS SUBMENU of any E1 port. Highlight STATISTICS in the INVERS

4-12 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014To view the performance statistics of any one E1 port, highlight that port and press Ente

Terminal Interface 4-134Figure 4-5 Additional NET STATISTICS.Table 4-3 NET Statistics Items Parameter DefinitionEFS Error Free Seconds (EFS) is calcul

4-14 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014BPV This display provides the number of Bipolar Violations (BPVs) that have occurred duri

Terminal Interface 4-154Event HistoryUse this screen to review and clear the DL3800E unit alarm and status history. To view the EVENT HISTORY, move th

4-16 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014To clear the report of all History Events, move the highlight bar to CLEAR HISTORY and pr

Terminal Interface 4-174ConfigurationThe CONFIGURATION MENU item provides access to a series of submenus to configure various parameters of the unit,

4-18 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Figure 4-8 UNIT CONFIGURATION MENU Table 4-5 Node Configuration OptionsOption ActionDate

Terminal Interface 4-194Front Panel This feature enables (On) or disables (Off) your ability to make changes in the configuration or run tests from th

VCCIREGULATORY COMPLIANCE• European harmonized standards 73/23/EEC/, 91/31/EEC, 89/336/EEC, 93/68/EEC, and 91/263/EEC• UL 1950 3rd Edition• CAN/CSA C2

4-20 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014To update the node database with all the changes made, move the highlight bar to CONFIRM

Terminal Interface 4-214Figure 4-9 DTE CONFIGURATION MENU (V.35)Figure 4-10 DTE CONFIGURATION MENU (RS449)DIGITAL LINK DL3800E SR 3.00.22 NODE 1:

4-22 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Figure 4-11 DTE CONFIGURATION MENU (X.21) Figure 4-12 DTE CONFIGURATION MENU (HSSI)DIGITA

Terminal Interface 4-234Table 4-6 DTE CONFIGURATION MENU Options Parameter Description/ActionDTE Interface This allows you to select V.35, RS449, X.21

4-24 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014DSR (Data Set Ready) This allows you to Assert, DeAssert, or set to automatic the DSR lea

Terminal Interface 4-254Network ConfigurationThis submenu allows you to configure various Network parameters. The configurable parameters include CRC4

4-26 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Figure 4-13 Network Configuration Screen Table 4-7 NETWORK CONFIGURATION MENU Options Par

Terminal Interface 4-274TSLOT16 Allows you to select between DATA and FLAG. If DATA is selected, timeslot 16 will be used for payload data. If FLAG is

4-28 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Network ThresholdsThis menu allows you to enable/disable the automatic FALLBACK feature a

Terminal Interface 4-294Figure 4-14 Network Thresholds ConfigurationThrough the CONSECUTIVE THRESHOLDS section of this menu, you disable or enable the

viiTable of ContentsPreface xviiAudience xviiOrganization xviiConventions xviiiSymbols xviiiTypography xixQuick Eagle Networks Technical Support xxRet

4-30 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Save ConfigurationThis option allows you to manually back up the database to EEPROM at an

Terminal Interface 4-314Software DownloadThis selection is used to choose the desired mode for upgrading the DL3800E unit software revision level via

4-32 DL3800E Inverse Multiplexer User’s Guide — July 9, 200141. Copy the files off the floppy onto the hard drive on the PC. The names of the files wi

Terminal Interface 4-334Software Download OptionsImmediate Software Activation (Enable/Disable)The IMMEDIATE SOFTWARE ACTIVATION mode is controlled fr

4-34 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014RAM Software Options RAM Software Options - Query RAM SoftwareThis feature determines whe

Terminal Interface 4-354TFTP Software DownloadIf immediate software activation is enabled on the target unit, the software is downloaded to the target

4-36 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014To delete the entire unit configuration, select DELETE ENTIRE UNIT CONFIGURATION from the

Terminal Interface 4-374To Restart Node Software, select DELETE ENTIRE UNIT CONFIGURATION from the SOFTWARE UTILITIES MENU (Figure 4-17) and press Ent

4-38 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Users must have Full Access class to view or change this screen. The name and password ca

Terminal Interface 4-394SNMP Configuration Through the SNMP CONFIGURATION MENU, you configure the Network Manager (NMS) port on the rear panel of the

viii DL3800E Inverse Multiplexer User’s Guide — July 9, 2001Application 2-3Functional Description 2-4Signal Flow 2-4E1 Port Crossover Detection 2-5Ove

4-40 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014Table 4-9 SNMP Configuration OptionsOption Description/ActionUnit IP Address The Unit IP

Terminal Interface 4-414To update the SNMP database with all the changes made, move the highlight bar to CONFIRM, and press the Enter key. Changes can

4-42 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014However, it is important to note that the remote IMUX’s “Unit IP Address” parameter must

Terminal Interface 4-434TestsThe TESTS MENU allows you to initiate or stop four types of loopbacks for each individual network port: DTE/NETWORK LOOPB

4-44 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014To initiate a test, use the CURSOR keys to move the highlight bar to DTE/Network Loopback

Terminal Interface 4-454Figure 4-21 Loopbacks within the DL3800E unit Remote Loopback DetectionThe DL3800E has the capability of detecting loopbacks w

4-46 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014.Manual Network RestorationThe DL3800E’s E1 ports are normally set to auto restore. Howev

Terminal Interface 4-474Figure 4-22 MANUAL NETWORK RESTORATION MENUTo manually restore an E1 port (network), use the UP and DOWN ARROW keys to highlig

4-48 DL3800E Inverse Multiplexer User’s Guide — July 9, 20014

5-15Front Panel Interface 5GENERALThe front panel (Figure 5-1) features a 16 character vacuum fluorescent display and four buttons that help you to mo

ixConfiguration 4-17Unit Configuration 4-17DTE Configuration 4-20Network Configuration 4-25Network Thresholds 4-28Save Configuration 4-30System Utilit

5-2 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015The front panel buttons are also used for Alarm Cutout. When an alarm condition occurs, th

Front Panel Interface 5-35Front Panel LEDsTable 5-1 Front Panel LEDsIndication DescriptionTest Test In Progress LEDOff No tests are in progress.Solid

5-4 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Access Levels And Protected ModeFront panel access can be limited by placing the DL3800E u

Front Panel Interface 5-55This procedure takes the unit out of the Protected Mode (and clears any password that may have been programmed) and sets all

5-6 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015This menu loop may also be entered at any time by pressing the Exit button to go up the me

Front Panel Interface 5-75The Configuration MENU is used to view and change the unit's configuration parameters, date and time, network interface

5-8 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Node (Common Equipment) StatusThis display shows the status of the unit. NODE STATUS is ac

Front Panel Interface 5-95DTE StatusThe next display shows the status of the DTE data port. The menu is accessed by pressing Enter when DTE STATUS app

5-10 DL3800E Inverse Multiplexer User’s Guide — July 9, 20015Pressing the DOWN ARROW from any of these displays will step you through the last 96 15-m

Front Panel Interface 5-115EB/CV An Errored Block (EB) is a block in which one or more bits are in error. The EB if therefore equivalent to the Code V