Loop Conversor

LOOP-E E1 CSU/DSUModel 1510

(Stand Alone)USER'S MANUAL

LOOP TELECOMMUNICATION INTERNATIONAL, INC.8F, NO. 8, HSIN ANN RD.SCIENCE-BASED INDUSTRIAL PARKHSINCHU, TAIWANTel: +886-3-578-7696Fax: +886-3-578-7695

2003 Loop Telecommunication International, Inc. All rights reserved.

Loop-E is a trade mark of Loop Telecommunication International, Inc.

P/N: 51.LE1510.1S011/2003 Version 1.6

- i -

TABLE OF CONTENTS

1. PRODUCT DESCRIPTION ..................................................................1-11.1 Description ...................................................................................................... 1-11.2 Applications..................................................................................................... 1-11.3 Specifications.................................................................................................. 1-4

2. INSTALLATION.....................................................................................2-12.1 Site Selection................................................................................................... 2-12.2 Mechanical and Electrical Installation .......................................................... 2-2

2.2.1 Mechanical Installation......................................................................... 2-22.2.2 Electrical Installation ............................................................................ 2-5

2.3 DIP Switch Operation for V.35 and X.21 ....................................................... 2-82.4 DIP Switch Operation for Bridge (Frame) ..................................................... 2-92.5 DIP Switch Operation for Bridge (Unframe) ............................................... 2-102.6 LED Operation............................................................................................... 2-12

3. OPERATION .........................................................................................3-13.1 DTE Configuration .......................................................................................... 3-1

3.1.1 CRC (Cycle Redundancy Check)......................................................... 3-13.1.2 TTM (Terminal Timing Mode) .............................................................. 3-13.1.3 Clock Invert .......................................................................................... 3-1

4. MAINTENANCE ....................................................................................4-14.1 Self-Test ........................................................................................................... 4-14.2 Diagnostics...................................................................................................... 4-1

4.2.1 Line Loopback...................................................................................... 4-14.2.2 DTE to DTE Loopback ......................................................................... 4-1

4.3 Verifying Loop-E Operations ......................................................................... 4-14.3.1 Quick Test............................................................................................ 4-14.3.2 Substitution .......................................................................................... 4-24.3.3 Using Loopback Plugs ......................................................................... 4-24.3.4 Using Bert Test Set.............................................................................. 4-2

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FIGURES

Figure 1- 1 Application Illustration - 1------------------------------------------------------------------------------------1-1Figure 1- 2 Application Illustration - 2------------------------------------------------------------------------------------1-2Figure 1- 3 Application Illustration - 3------------------------------------------------------------------------------------1-2Figure 1- 4 Application Illustration – 4 -----------------------------------------------------------------------------------1-3Figure 1- 5 Application Illustration - 5------------------------------------------------------------------------------------1-3Figure 2- 1 Loop-E E1 CSU/DSU Front Panel Views-----------------------------------------------------------------2-2Figure 2- 2 Rear Panel Views ----------------------------------------------------------------------------------------------2-3Figure 2- 3 Loop-E 1510 Stand Alone Internal Jumper Setting ----------------------------------------------------2-4Figure 2- 4 Jumper Setting for Bridge (Unframe)----------------------------------------------------------------------2-5Figure 2- 5 DIP Switch on Rear Panel (For V.35 and X.21) --------------------------------------------------------2-8Figure 2- 6 DIP Switch on Rear Panel (For Framed Bridge)--------------------------------------------------------2-9Figure 2- 7 DIP Switch on Rear Panel (For Framed Bridge)------------------------------------------------------ 2-10Figure 2- 8 DIP Switch on Bottom Side (For V.35 and X.21) ----------------------------------------------------- 2-11

TABLES

Table 2- 1 Loop-E 1510 Stand Alone Configuration ------------------------------------------------------------------2-4Table 2- 2 Configuration for ridge (Unframe Version) ----------------------------------------------------------------2-5Table 2- 3 RJ48 Line Connector-------------------------------------------------------------------------------------------2-5Table 2- 4 V.35/M34 DTE Port Pin Definition---------------------------------------------------------------------------2-6Table 2- 5 X.21/DB15 DTE Port Pin Definition-------------------------------------------------------------------------2-7Table 2- 6 RJ-45 for 10/100M Pin Assignment ------------------------------------------------------------------------2-7Table 2- 7 DIP Switch (SW1 to SW8) Indication on Rear Panel (For V.35 and X.21) -----------------------2-8Table 2- 8 E1 WAN：DIP Switch (SW1 to SW5) Indication on Rear Panel (For Framed Bridge)--------2-9Table 2- 9 E1 WAN：DIP Switch (SW6 to SW8) Indication on Rear Panel (For Framed Bridge)--------2-9Table 2- 10 E1 WAN：DIP Switch (SW3) Indication on Rear Panel (For Unframed Bridge) ------------ 2-10Table 2- 11 E1 WAN：DIP Switch (SW6 to SW8) Indication on Rear Panel (For Unframed Bridge) - 2-10Table 2- 12 DIP Switch Indication on Bottom Side ----------------------------------------------------------------- 2-11Table 2- 13 Front Panel LED Table------------------------------------------------------------------------------------- 2-12

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Compliance with :

(1) EMC EMI : EN50081-1

EN55022 (Conduction & Radiation) Class A EMS : EN50082-1

IEC801-2 (ESD, 8KV)ESD: ElectroStatic Discharge TestIEC801-3 (R/S, 27MHZ~500MHZ, 3V/M)R/S: Radiated Susceptibility TestIEC801-4 (EFT, 1KV)EFT: Power, Line/Date, Line Nose Test

(2) SAFETY EN 60950

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CAUTION:•••• Never install telephone wiring during a lightning storm.•••• Never install telephone jacks in wet locations unless the jack is specifically

designed for wet locations.•••• Never touch uninsulated telephone wires or terminals unless the telephone line

has been disconnected at the network interface.•••• Use caution when installing or modifying telephone lines.

_________________________

Standard Lists_________________________

Loop-E E1 is designed to meet the following standards:

•••• ITU G.703, G.704, G.706, G.732, G.736, G.823, ETSI ETS 300420, and ETS300419.

Chapter 1 Production Description

1-1

1. PRODUCT DESCRIPTION

1.1 Description

Loop-E 1510 provides E1 network interface, DS0 channel multiplexing, and direct connections to data, andvideo DTE (Data Terminal Equipment). This manual applies only to the Stand-Alone model.

Loop-E 1510 also supports framed/unframed E1-to-Ethernet Bridge, provides an economic solution to E1network access. The E1-to-Ethernet Bridge supports fractional or clear channel E1 WAN port with HDB3(High Density Bipolar 3) coding and continuous error checking, and single 10/100 Ethernet LAN port withbridging function.

Loop-E E1 CSU/DSU can be configured via the DIP switches.

1.2 Applications

The Loop-E E1 CSU/DSU application example is illustrated in Figure 1-2. Via DACS (Digital Access Cross-Connect System), the Loop-E interfaces various applications such as LAN (Local Area Network) to WAN(Wide Area Network) communications, Host to workstation communications, video conferencing and datacommunication of PBXs (Private Branch Exchanges). This allows the user to integrate different applicationinto a single communication link and utilizing only part of the available bandwidth. Furthermore, this allowsthe user to expand bandwidth, up to 31 DS0 channels, on demand without additional physical links becausethey are already available. Data and video applications may include equipment such as video conferencing,bridge, router, gateway, workstation, host computer, and various high-speed data terminal equipment. Figure1-3 to Figure 1-5 illustrates some of these applications.

Figure 1- 1 Application Illustration - 1

Loop-E VideoConference

Loop-E CAD/ CAM

Bridge/Router

Loop-E

Loop-E

VideoConference

CAD/ CAM

Loop-EDigital Cross-

Connect

Digital Cross-Connect

Digital Cross-Connect

Fractional E1 Network & Services

Chapter 1 Product Description

1-2



Loop-E

E1

Bridge/Router

Bridge/Router

Loop-E

E1

Loop-EE1

Bridge/Router

Bridge/Router

Loop-E


1-3

Figure 1- 4 Application Illustration – 4


Loop-EE1

CLUSTERCONTROLLER

HOSTCOMPUTER

Loop-E

WANE 1510

Bridge

LAN

Router10/ 100 BaseT E1

Branch Office or SMB


1-4

1.3 Specifications

Network Line Interface (E1 Interface)Line Rate 2.048 Mbps ± 50 ppmLine Code HDB3Input Signal ITU G.703Jitter ITU G.823Framing ITU G.704Connector BNC/RJ48C (specify on order)Output Signal ITU G.703Electrical 75Ω Coax/120Ω twisted pairDTE Interface (V.35)Data Port Single DTEData Rate n ∗ 64 Kbps ( n = 1 - 32)Connector M34DTE Interface (X.21)Data Port Single DTEData Rate n ∗ 64 Kbps ( n = 1 - 32)Connector DB15Alarm Relay Alarm Relay, Fuse alarm, and performance alarmBridge InterfaceData Port Single EthernetPhysical Interface 802.3 10BaseT, 802.3u 100BaseTXConnector RJ45! Bridge function! Auto-negotiationClear Channel (Unframed)Data Rate 2048 Kbps (32 * 64Kbps)Diagnostics TestLoopbacks Line Loopback and DTE Loopback


1-5

Front PanelMulticolor LED Indicator

Physical/ElectricalDimensions 21 x 14 x 4.15 cm (WxHxD)Power 100-240Vac, 24Vdc, 48VdcTemperature 0 -50°CHumidity 0-95% RH (NON-CONDENSING)Mounting Desk-top stackableComplianceETSI ETS 300420, ETS 300419Pan European CTR 12/13, CE 168XBABT NTR4ITU G.703, G.704, G.706, G.732, G.736, G.823EMI/EMC EN50082-1, EN55022 Class ASafety EN60950

LINE

SYNC/TEST LOF BPV RAI TEST TD RDCS

DTEPOWER

CLK-LOSS

Loop-EE1 CSU/DSU

TM

E1510 with V.35 Interface

LINE

SYNC/TEST LOF BPV RAI ALARM/TEST TD RDCS

DTEPOWER

CLK-LOSS

Loop-EE1 CSU/DSU

TM

ACO

E1510 with X.21 Interface

E1 WAN

SYNC/TEST LOF BPV RAI LINK/ACT 10/100 FDXCS

ETHERNET LANPOWER

Loop-E TM

E1510 with Bridge Interface (Frame Version)

E1 WAN

LINK LINK/ACT 10/100 FDX

ETHERNET LANPOWER

Loop-E TM

E1510 with Bridge Interface (Unframe Version)

Chapter 2 Installation

2-1

2. INSTALLATIONCAUTION:

•••• Never install telephone wiring during a lightning storm.

•••• Never install telephone jacks in wet locations unless the jack is specifically designed for wetlocations.

•••• Never touch un-insulated telephone wires or terminals unless the telephone line has beendisconnected at the network interface.

•••• Use caution when installing or modifying telephone lines.

2.1 Site Selection

The following are guidelines for site selection. These guidelines must be followed to ensure a properinstallation site.

• The installation site should have an AC power receptacle.

• The following are the maximum suggested cable lengths:

V.35 60m (200 ft)

X.21 60m (200 ft)

NOTE: If longer distance is desirable, a lower than maximum speed with proper cabling and grounding isadvisable. For more information, please contact Loop Service Representative.

• The installation site should provide space for adequate ventilation and cable routing. Reserve at least 12cm (5 inches) at the rear of the unit for cables and air flow.

• The site should provide a stable environment. The operating area should be clean and free from extremesof temperature, humidity, shock, and vibration.

• Relatively humidity should stay between 0 and 95%. Do not operate the unit at an altitude greater than3000 meters (10,000 feet).


2-2

2.2 Mechanical and Electrical Installation2.2.1 Mechanical InstallationLoop-E E1 CSU/DSU Stand-Alone version is a desk top unit, which is stackable. The front panel and the rearpanel are shown in the following figures.

Figure 2- 1 Loop-E E1 CSU/DSU Front Panel Views

LINE

SYNC/TEST LOF BPV RAI TEST TD RDCS

DTEPOWER

CLK-LOSS

Loop-EE1 CSU/DSU

TM

LINE

SYNC/TEST LOF BPV RAI ALARM/TEST TD RDCS

DTEPOWER

CLK-LOSS

Loop-EE1 CSU/DSU

TM

ACO

E1 WAN

SYNC/TEST LOF BPV RAI LINK/ACT 10/100 FDXCS

ETHERNET LANPOWER

Loop-E TM

E1 WAN

LINK LINK/ACT 10/100 FDX

ETHERNET LANPOWER

Loop-E TM

For V.35

For X.21

For Bridge (Frame Version)

For Bridge (Unframe Version)


2-3

Figure 2- 2 Rear Panel Views

1 2 3 4 5 6 7 8ON

LIN

E-C

LKD

TE-C

LKC

RC

DTE-

LBLI

NE-L

BTT

M O

NC

LK-IN

V

DTE

-INV

NT-

CLK

OFF

OFF

OFF

TTM

OFF

NORM

ALNO

RMAL

50-60HZ, 0.15A MAX.

E1RX-IN TX-OUT

DTE - V.35AC LINE, 100-240VAC

1 2 3 4 5 6 7 8ON

LIN

E-C

LKD

TE-C

LKC

RC

DTE-

LBLI

NE-L

BTT

M O

NC

LK-IN

V

DTE

-INV

NT-

CLK

OFF

OFF

OFF

TTM

OFF

NORM

ALNO

RMAL

50-60HZ, 0.15A MAX.

E1RX-IN TX-OUT

DTE - X.21

AC LINE, 100-240VAC

NC COM NO

RELAY

NC COM NO

RELAY

POWER (DC 24V)

-V +V

POWER (DC 48V)

-V +V

OR

50-60HZ, 0.15A MAX.

E1RX-IN TX-OUT

ETHERNETAC LINE, 100-240VAC

10/100

INT-

CLK

OFF

OFF

SW6

SW7

SW8

1 2 3 4 5 6 7 8ON

LINE

-CLK

CRC

LINE

-LB

LAN

OFF

OFF

REMO

TE-L

B

BERT

50-60HZ, 0.15A MAX.

E1RX-IN TX-OUT

ETHERNETAC LINE, 100-240VAC

10/100

OFF

SW6

SW7

SW8

1 2 3 4 5 6 7 8ON

LINE

-LB

LAN

For Bridge (Frame)

For Bridge (Unframe)


2-4

Table 2- 1 Loop-E 1510 Stand Alone Configuration

TP (120 ohm) BNC * (75 ohm)J1 1,2 J1 2,3 (BNC)J2 1,2 J2 2,3 (BNC)J3 1,2 J3 2,3 (BNC)J4 1,2 J4 2,3 (BNC)J5 1,2 J5 2,3 (BNC)J6 1,2 J6 2,3 (BNC)J7 1,2 J7 2,3 (BNC)

Note: When BNC connector is selected, the user has the option of grounding the received BNCshield by installing a jumper clip on the jumper location. This is usually not necessary, butif you have any noise on your device it can often be filtered out by using thisgrounding process.

Figure 2- 3 Loop-E 1510 Stand Alone Internal Jumper Setting

Main Boardfor V.35

and Bridge

Front Side

Rear Side

1 2 3

JUM6

1 2 3

JUM2

1 2 3

JUM3

3 2 1JUM5

1 2 3JUM4

3 2 1JUM7

1 2 3JUM1

BNC(75 ohm)

Main Boardfor V.35

and Bridge

Front Side

Rear Side

1 2 3

JUM6

1 2 3

JUM2

1 2 3

JUM3

3 2 1JUM5

1 2 3JUM4

3 2 1JUM7

1 2 3JUM1

TP(120 ohm)

TP TP TP BNC BNC BNC

JUM8

BNC TP BNC BNC TP BNC

Main Boardfor X.21

Front Side

Rear Side

3 2 1JUM5

1 2 3JUM4

3 2 1JUM7

1 2 3JUM1

BNC(75 ohm)

Main Boardfor X.21

Front Side

Rear Side

3 2 1JUM5

1 2 3JUM4

3 2 1JUM7

1 2 3JUM1

TP(120 ohm)

JUM8

BNC TP BNC BNC TP BNC

JUM2 JUM6JUM3

TP TP TP1 2

3

1 2

3

1 2

3

JUM2 JUM6JUM3

BNC BNC BNC

1 2

3

1 2

3

1 2

3


2-5

Table 2- 2 Configuration for ridge (Unframe Version)

Jumper Internal Clock Setting Line Clock Setting Default SettingJ10 1, 2 2, 3 1, 2

Figure 2- 4 Jumper Setting for Bridge (Unframe)

2.2.2 Electrical InstallationLoop-E E1 CSU/DSU Stand-Alone version is AC powered. Use the rear right power connector to connect toan AC power outlet.Network connection is supported by RJ48 or BNC connector. The line interface is labeled with LINE. RJ48connector pin definition is listed in the following table.

Table 2- 3 RJ48 Line Connector

Pin Number Signal Signal Direction1 Receive Ring From E1 Network2 Receive Tip From E1 Network3 Unassigned4 Transmit Ring To E1 Network5 Transmit Tip To E1 Network6 Unassigned7 Shield Ground8 Shield Ground

The DTE port is configured as a DCE device. Pin definitions for V.35/ M34 is defined in the following table.

Note:For the case of balanced twisted pair interface, if the transmit and receive pairs have shields, then onlyone end of the shields should be connected to earth. If the near end is selected for grounding the shields,the two shield pairs on the RJ48 connector can be used for this purpose.

Main Board

Front Side

Rear Side

1 2 3

JUM10

( Internal Setting )Main Board

Front Side

Rear Side

1 2 3

JUM10

( Line Setting )


2-6

Table 2- 4 V.35/M34 DTE Port Pin Definition

Pin Number Signal Source

A Cable ShieldB Signal GroundC Request To Send DTED Clear To Send DCEE Data Set Ready DCEF Data Carrier Detect DCEH Data Terminal Ready DTEJ UnassignedK UnassignedL Local Loopback DTEM UnassignedN Remote Loopback DTEP Transmit Data DTER Receive Data DCES Transmit Data Return DTET Receive Data Return DCEU External Clock DTEV Receive Clock DCEW External Clock Return DTEX Receive Clock Return DCEY Transmit Clock DCEZ Unassigned

AA Transmit Clock Return DCEBB UnassignedCC UnassignedDD UnassignedEE UnassignedFF UnassignedHH UnassignedJJ UnassignedKK UnassignedLL UnassignedMM UnassignedNN Test Mode DCE


2-7

Table 2- 5 X.21/DB15 DTE Port Pin Definition

Pin Number Signal Source

1 Cable Shield2 Transmit Data DTE3 Control DTE4 Receive Data DCE5 Indication DCE6 Signal Timing DCE7 External Clock DTE8 Signal Ground9 Transmit Data Return DTE10 Control Return DTE11 Receive Data Return DCE12 Indication Return DCE13 Signal Timing Return DCE14 External Clock Return DTE15 Unassigned

Table 2- 6 RJ-45 for 10/100M Pin Assignment

Pin Number Signal Signal Direction

1 Transmit Data + Output from E15102 Transmit Data - Output from E15103 Receive Data + Input to E15104 No Connection5 No Connection6 Receive Data - Input to E15107 No Connection8 No Connection


2-8

2.3 DIP Switch Operation for V.35 and X.21

Table 2- 7 DIP Switch (SW1 to SW8) Indication on Rear Panel (For V.35 and X.21)

SW No.

Function Direction Description Default

"""" (OFF), """" (OFF) Internal clock"""" (OFF), #### (ON) DTE clcok#### (ON), """" (OFF) Line clock

SW1, SW2 Clock Source

#### (ON), #### (ON) Not used

"""" (OFF), """" (OFF)

"""" (OFF) CRC offSW3 CRC

#### (ON) CRC on"""" (OFF)

"""" (OFF) Disable DTE to DTE loopbackSW4 DTE Loopback

#### (ON) Enable DTE to DTE loopback"""" (OFF)

"""" (OFF) Disable Line loopbackSW5 Line Loopback

#### (ON) Enable Line loopback"""" (OFF)

"""" (OFF) TTM offSW6 TTM

#### (ON) TTM on"""" (OFF)

"""" (OFF) Clock normalSW7 Clock Invert

#### (ON) Clock invert"""" (OFF)

"""" (OFF) DTE clock normalSW8 DTE Clock Invert

#### (ON) DTE clock invert"""" (OFF)

Figure 2- 5 DIP Switch on Rear Panel (For V.35 and X.21)

1 2 3 4 5 6 7 8ON

LIN

E-C

LKD

TE-C

LKC

RC

DTE

-LB

LIN

E-LB

TTM

ON

CLK

-INV

DTE

-INV

INT-

CLK

OFF

OFF

OFF

TTM

OFF

NO

RM

AL

NO

RM

AL


2.4 DIP Switch Operation for Bridge (Frame)Table 2- 8 E1 WAN：：：：DIP Switch (SW1 to SW5) Indication on Rear Panel (For Framed Bridge)

SW No.


"""" (OFF), """" (OFF) Internal clockSW1 Clock Source

"""" (OFF), #### (ON) Line clock"""" (OFF), """" (OFF)

"""" (OFF) CRC offSW2 CRC

#### (ON) CRC on"""" (OFF)



"""" (OFF) Disable Remote LoopbackSW4 Remote

Loopback #### (ON) Enable Remote Loopback"""" (OFF)

"""" (OFF) Disable BERT test patternSW5 BERT

#### (ON) Enable BERT test pattern"""" (OFF)

Table 2- 9 E1 WAN：：：：DIP Switch (SW6 to SW8) Indication on Rear Panel (For Framed Bridge)

SW No.

Auto-negotiation 100 Full 10 Full 100 Half 10 Half

SW6 1 0 0 1 1SW7 1 1 0 1 1SW8 1 1 1 1 1

NOTE: 1 for DIP switch OFF, 0 for DIP switch ON.

Figure

2-9

2- 6 DIP Switch on Rear Panel (For Framed Bridge)

INT-

CLK

OFF

OFF

SW6

SW7

SW8

1 2 3 4 5 6 7 8ON

LINE

-CLK CR

CLI

NE-L

B

LAN

OFF

OFF

REMO

TE-L

B

BERT


2.5 DIP Switch Operation for Bridge (Unframe)Table 2- 10 E1 WAN：：：：DIP Switch (SW3) Indication on Rear Panel (For Unframed Bridge)

SW No.




Table 2- 11 E1 WAN：：：：DIP Switch (SW6 to SW8) Indication on Rear Panel (For Unframed Bridge)

SW No.

Auto-negotiation 100 Full 10 Full 100 Half 10 Half

SW6 1 0 0 1 1SW7 1 1 0 1 1SW8 1 1 1 1 1

NOTE: 1 for DIP switch OFF, 0 for DIP switch ON.

Figure

2-10

2- 7 DIP Switch on Rear Panel (For Framed Bridge)

OFF

SW6

SW7

SW8

1 2 3 4 5 6 7 8ON

LINE

-LB

LAN


Table 2- 12 DIP Switch Indication on Bottom Side

NOTE: This DIP switch is for V.35, X.21, and framed Bridge interfaces only.

Functtion Direction Description Default

"""" (ON) E1 is framed.E1 TS0 Frame status

#### (OFF) E1 is unframed."""" (ON)

"""" (ON) Time slot is maped to DTE.E1 TS1 to 31 Time Slot status

#### (OFF) Time slot is idle."""" (ON)

E

EN

2-11

Figure 2- 8 DIP Switch on Bottom Side (For V.35, X.21, framed Bridge)

Example 1:

E1 is framed. DTE rate = 3 x 64K = 192 Kbps on TS1, TS2, and TS3.

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

E1 TS 0 7 15 23 31

xample 2:

1 is unframed. DTE rate = 2048 Kbps.ote TS1 to TS31 are don’t care.

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

E1 TS 0 7 15 23 31

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

E1 TS 0 7 15 23 31


2-12

2.6 LED OperationThe front panel has 10 LEDs for operation and error indications. The following table lists each LED and itscolor and indications.

Table 2- 13 Front Panel LED Table

LED Color Indication

All LEDs Flashing $ Off Self testing $ Initialization done

POWER OffGreen

Power offPower on

For DTE – V.35

SYNC/TESTOffGreenFlashing Green

Loss of frame sync or loss of signalNormal (Line in SYNC)Testing

LOF OffRed

Normal or in unframe modeLoss of Frame Sync (LOFS) or Loss of Signal ( LOS)

BPV OffRed

Normal or in unframeLoss of frame sync or loss of signal

RAI OffAmber

Normal or in unframe modeReceive Remote Alarm Indication from E1 line in frame mode

LINE

CS OffRed

NormalLine control slip

TEST OffFlashing Green

NormalDTE in test

TD Flickering Green Transmit data presentRD Flickering Green Receive data present

DTE/V.35

CLK-LOSS OffRed

NormalLoss of clock from DTE or Clock source error


2-13

LED Color IndicationFor DTE – X.21



LOF OffRed


BPV

OffRedFlashing Red+Test Green

Normal or in unframeLoss of frame sync or loss of signalTest-pattern Bit error

RAI OffAmber


LINE

CS OffRed


Off Normal Status: NC and COM is short.NO and COM is open.

ALARM/TESTFlashing Green Alarm Status: NC and COM is open.

NO and COM is short.

NOTE:! This LED, ALARM/TEST, will be lighted when these condition occurs: LOF, BPV, RAI,

CS, CLK-LOSS, or power loss.! Press ACO button of front panel to clear alarm.

TD Flashing Green Transmit data presentRD Flashing Green Receive data present

DTE/X.21

CLK-LOSS OffRed

NormalLoss of clock from DTE or Clock source error


2-14

LED Color IndicationFor Bridge – Frame



LOF OffRed


BPV OffRed

Normal or in unframeLoss of frame sync or loss of signal

RAI OffAmber


E1

WAN

CS OffRed


Link/Act GreenFlashing Green

LinkActive

10/100 OffGreen

10Mbps100Mbps

ETHERNETLAN

FDX OFFGreen

Half duplexFull duplex

For Bridge – UnframeE1

WAN

LINK Green Link

LINK/ACT GreenFlashing Green

LinkActive

10/100 OffGreen

10Mbps100Mbps

ETHERNET

LAN

FDX OFFGreen

Half duplexFull duplex

Chapter 3 Operation

3-1

3. OPERATIONThis chapter describes the Loop-E 1510 CSU/DSU configuration options and operational functions.

3.1 DTE Configuration

3.1.1 CRC (Cycle Redundancy Check)Loop-E can be used in two frame or multiframe mode. For two frame mode, set CRC (Cycle RedundancyCheck) to OFF. For multiframe mode, set CRC to ON. A proprietary facility data link is implemented in bothmodes to facilitate remote system control and performance and statistics monitoring.

3.1.2 TTM (Terminal Timing Mode)In the normal condition, Loop-E uses Transmit Clock to sample DTE Transmit Data, which is transmittedfrom DTE facility. In terminal timing mode, DTE facility uses Transmit Clock to drive Transmit Data and loopthis clock to Loop-E via External Clock. In this mode, Loop-E will use External Clock to sample TransmitData instead of using Transmit Clock. This method is to avoid phase delay due to cable length. In otherwords, if the DTE cable is too long, the transmit data may not in-phase with the Transmit Clock. With thisfeature, the External Clock and Transmit Data will be in-phase.

3.1.3 Clock InvertThe clock polarity of the DTE port is either normal or inverted. It is used to drive transmit data and to samplereceive data.

Chapter 4 Maintenance

4-1

4. MAINTENANCE

4.1 Self-Test

At system power up, a complete self-test routine is run to check all I/O ports, read/write memory, and datapaths to validate system integrity. During the system self test, all LEDs are flashing until the initializatiohn isdone. When self-test is done, all LEDs are off.

4.2 Diagnostics

4.2.1 Line LoopbackLine loopback is illustrated in Figure 4-1. The incoming E1 line signal is loopback to the outgoing E1 signalbefore the E1 transceiver framer. This loopback is used to isolate the local equipment from a troubled E1transmission line. Line loopback test can be activated from the front panel and terminal.

4.2.2 DTE to DTE LoopbackDTE to DTE port loopback is illustrated in the following figure. TO-DTE is when DTE incoming signal isloopback to the DTE outgoing signal. This loopback is used to validate the unit integrity of DTE facility.

Figure 4- 1 Loopback Block Diagram

4.3 Verifying Loop-E Operations

The purpose of this section is not to help the user determine where a possible fault in the network may lie.For this, the user needs to know the exact geometry of the network. Then standard network trouble shootingprocedures should be followed, which involve sectionalizing the network and performing loopback tests onpieces of the network.

The purpose here is to help the user determine whether the Loop-E equipment is at fault after tests havepointed a suspicious finger at this equipment. The procedures outlined here depends on test equipment andother equipment the user may have on hand.

The organization of these procedures start from the simple to the complex. The procedure ends when adefinitive conclusion is made that the Loop-E equipment is at fault. To verify that the Loop-E equipment is notat fault, specialized equipment such as a BERT (bit error rate test) set is needed.

4.3.1 Quick TestSee if the LEDs show any abnormal displays. If yes, use the LED indications to guide the user to test otherparts of the network, such as the E1 line, or DTE equipment.

Especially during initial installation, excessive errors may be due to (a) incorrect configuration of either Loop-E or of the equipment at the other end of the line, or (b) due to faulty line installation, which results in

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excessive noise, cross talk, or impedance mismatch. Especially in electrically noisy environments, such ascentral offices, use of shielded cables are mandatory.

4.3.2 SubstitutionIf a spare Loop-E is available, then replace the working one with the spare. The user must carefully configurethe spare exactly as the working one. If the substitution clears the problem, then the original working one issuspect. Note that this is not definitive as other reasons may cause the same symptom. A good practice is toreconfigure the original one and swap once more.

If both units behave the same, then the problem is probably elsewhere.

4.3.3 Using Loopback PlugsWithout a spare, loopback plugs are handy for diagnosis. Note that internal loopback facilities of the Loop-Edoes not include the interface circuitry. Thus a set of plugs, one for each of the interfaces, line and DTE, areneeded for complete tests. These plugs are wired such that signals from the Loop-E are loopback by hardwire back to the receive pin of the same plug.

Replace the line connector with a loopback plug. Observe if the line is in sync. If not then Loop-E has failed.Then perform a PRBS test towards the line. If this fails, then Loop-E has failed.

For the DTE ports, a loopback plug must be used in concert with a far end Loop-E if such a terminal isavailable, then a PRBS test will determine if that DTE port is at fault.

Note that if a far end terminal is available, the first test should be a local line loopback to see if the line isgood.

If the local DTE has diagnostic capabilities, then a loopback plug towards the DTE would help determine ifthe line to the DTE is good. This can further help isolate the problem.

If tests with loopback plugs all pass, then the problem is probably elsewhere.

4.3.4 Using Bert Test SetIf a BERT (bit error rate test) set is a available, such as the Fireberd 6000, then a comprehensive suite of testare available to examine the health of the Loop-E.

With a BERT, each of the ports of the Loop-E can be tested individually. The user must configure the BERTin the exact way the Loop-E is configured. This is easily done by comparing each of the options one by one.After checking that the configuration matches, if any one of the ports fails, then Loop-E has failed.

Loop Conversor

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