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Operating guide

Private Circuits

NETWORK TERMINATING UNIT 6

KiloStream Private Circuits

International KiloStream Private Circuits


Operating guide

To report a fault with your KiloStream private circuit, please ring your

BT Service Centre on this number:

Please quote:

your circuit type

your circuit number(s)

your end address

For International KiloStream private circuits please ring the number

provided in your customer handover information.

2


Operating guide

Contents

1 About this guide 4

2 About NTU6 4

3 The equipment you’ll see 5

Single NTU 5

Multiple NTU 5

Cabling distance 6

4 Getting started 7

Examining the set-up of your NTU 8

Looking at the corrent status of your NTU 12

5 If you have a problem 9

6 Testing your private circuit 10

Using the test menu 10

Testing your terminal equipment 11

Testing the connection from the network 11

Testing the operation of the entire circuit 12

7 How to report a fault 14

3


Operating guide

1 About this guide

This Operating Guide gives you information on the network terminating

unit 6 (NTU6), including:

• What the display means

• How to use the test facilities

• What to do if you have a problem.

2 About NTU6

A dedicated digital private circuit service, offering either data or voice

transmission.

A national private circuit

KiloStream circuit

Customer

Terminal

Equipment

Network

Terminating

Unit

Network

Network

Terminating

Unit

Customer

Terminal

Equipment

Customer's Premises

Customer's Premises

An international private circuit

International KiloStream circuit

Customer

Terminal

Equipment

Network

Terminating

Unit

Network

Network

Terminating

Unit

Customer

Terminal

Equipment

UK Customer's Premises

Distant Country Customer's Premises

4


Operating guide

3 The equipment you’ll see

BT digital private circuits terminate at your premises on a network

terminating unit (NTU) which is provided within the rental price.

Any on-site wiring and equipment beyond the NTU is your responsibility

and maintained by the relevant contractor. This may be BT or an

independent supplier.

One of our engineers will connect the NTU to the BT network. If you

alter the line connections in any way, you will set off remote alarms

within the BT network and your service may be affected

Single NTU

If you’ve ordered a single circuit, the unit is contained in a blue

rectangular box. The lamps on the front of the unit, in conjunction with

the liquid crystal display (LCD), show the operating state of the circuit.

Front view of KiloStream NTU6 single unit

Liquid Crystal Display

FAULT

TM

RX NRDY

RXD

MENU SCROLL TOGGLE PROG TX NRDY

Multiple NTU

If you’ve ordered a number of lines, or a network of services, you will

need a multiple NTU. This normally consists of a series of NTUs in

‘card’ form. Each ‘card’ will be shelf mounted in a stacking system.

5


Operating guide

There is only one LCD for a shelf of multiple NTUs. To select the NTU

for which you want to display details on the LCD, press the appropriate

DISP button. A yellow LA lamp confirms the NTU you’ve selected.

The LCD will continue to show information from that NTU until you

press another DISP button.

Front view of NTU6 shelf mounted unit

FAULT

TM

LA

FXD

RX

NRDY

NTUs

Blanking panels over

vacant spaces

Liquid Crystal

Display

Display Unit

Yellow lamp

Button

DISP

Yellow lamp

Button

TX

NRDY

Power Unit

Cabling distance

To achieve the best performance from your circuit, the cabling distance

between the NTU and any data terminal equipment (DTE) shouldn’t

exceed 180 meters. If you relocate the DTE at any time, please ensure

that you don’t exceed this distance.

6


Operating guide

4 Getting started

When we connect your private circuit, the LCD will show one of three

menu headings: OPTIONS , STATUS or TEST .

To rotate the LCD to the menu you require:

• press the up or down Scroll button.

When you see the > symbol on the right of the LCD display, there are

further options available within the menu. To see these further options:

• press the Menu button.

When your circuit is provided, depending on the type of circuit and the

conditions at the distant end, the STATUS menu will show one of the

following messages, and a light may also be illuminated:

circuit type message you see light illuminated

X.21 64kbit/s /56kbits S: NTU READY –

X.21 2.4-48kbit/s S: NTU NOT READY RX NRDY

X.21 bis (v.24) cct. S: NTU READY RXD

108/1 held high by BT

X.21 bis (v.24) cct. S: NTU NOT READY RX NRDY

108/1 under your control

Whenever a binary 1 is present in the recieved data, the RXD light will

be illuminated.

7


Operating guide

Examining the set-up of your NTU

You can use the OPTIONS menu (which is display-only) to examine the

set-up of your NTU. There are six messages:

0: X21/X21 BIS 0: 105 SET ON 0: 106 DELAY

0: 107=108/1 0: 108/1 SET ON NO X21 OPTIONS

If your NTU is set for X21, press the up or down Scroll button to see the

NO X21 OPTIONS message.

Looking at the current status of your NTU

You can use the STATUS menu (which is display-only) to examine the

current operational status of the NTU in its normal state. There are six

messages:

S: LOOP ACTIVE S: NTU NOT READY S: NTU READY

S: SEND DATA S: RECEIVE DATA S: DATA TRANSFER

The NTU display will always revert to one of the messages above when

you press the up or down Scroll button.

8


Operating guide

5 If you have a problem

If you think there’s a problem with your KiloStream private circuit or with

your NTU, please try the checks below: you may be able to solve the

problem.

If a fault proves to be in your terminal equipment or on-site wiring, rather

than in the private circuit, BT reserves the right to charge for time spent on

a visit to your premises: it’s in your interest to carry out these checks first.

if you see the cause is you should

no lights illuminated no power to the NTU switch the power on and check

and a blank LCD

all connections

S: NTU NOT READY and a fault on the circuit check all connections to the NTU

FAULT light illuminated

and then report the fault to the

relevant Service Centre

S: NTU NOT READY and the TX NRDY button or local ask the distant end user to check

FAULT and RXD lights loop has been operated at

illuminated

the distant NTU

S: NTU NOT READY and the distant data terminal ask the distant end user to check

RX NRDY light illuminated equipment (DTE) is not

connected

S: LOOP ACTIVE

and TM light illuminated

a remote loop has been

activated at the distant end

ask the distant end user to check

S: RECEIVE DATA and the TX NRDY button has deselect the TX NRDY button

TX NRDY and RXD lights been operated on the local

illuminated

NTU

S: RECEIVE DATA and the local DTE is not raising check with your DTE supplier

RXD light illuminated a ‘request to send’ signal

9


Operating guide

Testing your private circuit

Using the Test menu

You can test the circuit and the operation of your NTU by using the

TEST MENU . You can implement the following conditions, which may help

you isolate faults in either the BT network or your terminal equipment.

All the tests, except the self-test and the lamp test, interrupt data flow.

select

T: LOCAL LOOP

T: LOOPBACK

T: SELF TEST

T: REMOTE LOOP

T: SEND BIN 1

T: SEND BIN 0

T: LAMP TEST

to

loop your NTU towards your terminal equipment (see below)

loop your NTU towards the distant end (see below)

run a self-test on the NTU; if the NTU doesn’t pass it locks with

the message SELF TEST FAIL and you should report this to the

relevant X-Stream Service Centre

to cause the distant end to provide a loop back – only possible

where the NTU is set for X21 bis working (see below)

transmit binary 1s to the distant end

transmit binary 0s to the distant end

illuminate all lights on the NTU

For national KiloStream circuit

Local site

Remote site

NTU

Local end

Local

exchange

Digital

network

main link

Local

exchange

Local end

NTU

Local

loop

Loopback

Remote

loop

Types of Test Loops

10


Operating guide

For international KiloStream circuits

UK

Distant country

Local site

Distant site

Customer

Terminal

Equipment

NTU

UK

access

section

International

Gateway

International

Gateway

Distant

access

section

NTU

Customer

Terminal

Equipment

Local

loop

Loopback

Digital Network

Main Link

Types of Test Loops

Testing your terminal equipment

To test the connection and operation of your terminal equipment through

the customer interface of the NTU, you need to apply to a local loop. To do

this, follow the steps below:

press

to

Menu button rotate the LCD to TEST MENU ; after three seconds the LCD

changes to T: LOCAL LOOP (flashing)

Toggle button

freeze

T: LOCAL LOOP

Prog button

apply a local loop (the red TM light is illuminated and, after one

minute, the LCD changes to S: LOOP ACTIVE ); you can’t send

data to, or receive data from, the distant end

11


Operating guide

Testing the connection from the network

If there is a problem with your KiloStream circuit, a BT engineer may ask

you to apply a loopback. This helps locate the fault by allowing BT to

test the connection from the network through the local end and the

NTU. To apply a loopback, follow the steps below:

press

to

Menu button rotate the LCD to TEST MENU ; after three seconds the LCD

changes to T: LOCAL LOOP (flashing)

up or down Scroll rotate the LCD to T: LOOPBACK (flashing)

button

Toggle button

freeze

T: LOOPBACK

Prog button

apply a loopback (the red TM light will be illuminated and, after

one minute, the display changes to S: LOOP ACTIVE ); you can’t

send data to, or receive data from, the distant end

Testing of the operation of the entire circuit

(national 2.4-48kbit/s circuits only)

To test the connection of the operation of the entire circuit, you need to

apply a remote loop. To do this, follow the steps below:

press

to

Menu button rotate the LCD to TEST MENU ; after three seconds the

LCD changes to T: LOCAL LOOP (flashing)

up or down Scroll button rotate the LCD to T: REMOTE LOOP (flashing)

Toggle button

freeze

T: REMOTE LOOP

Prog button

apply a remote loop (the red TM light will be illuminated and,

after one minute, the display changes to S: LOOP ACTIVE );

you can’t send data to, or receive data from, the distant end

12


Operating guide

Testing the operation of the entire circuit (national

64kbit/s circuits)

To test the connection and operation of the entire circuit, you need to

apply a remote loop. Although the remote loop facility is not available

on 64kbit/s KiloStream circuits, you can simulate a remote loop by

contacting the distant end user and asking the user to apply a loopback.

if the LCD displays press to

S: LOOP ACTIVE

Menu button rotate the LCD to TEST MENU ;

after three seconds the LCD changes

to T: LOCAL LOOP

up or down Scroll

button

rotate the LCD until it reaches a

steady (not flashing) display

T: LOCAL LOOP , Toggle button make the LCD flash

T: REMOTE LOOP

T: LOOPBACK

or

Prog button

remove the loop; the TM light is no

longer illuminated and, after one

minute, the LCD returns to

STATUS MENU

On International KiloStream circuits it is not possible to call up a remote

loop from your NTU6. You will need to contact the distant end user and

ask them to apply a loopback.

13


Operating guide

11 How to report a fault

BT has established X-Stream Service Centres to deal exclusively with

maintaining KiloStream and MegaStream digital private circuits.

Before you contact an X-Stream Service Centre, you should:

• ensure that the fault is in the private circuit or NTU and isn’t due to

your own wiring or terminal equipment

• ensure that all plugs are properly connected and that there is power to

the equipment

• ensure that any non-BT maintained equipment is working

• carry out the tests described in the section above, Testing your private

circuit.

If the fault is with the private circuit or the NTU, please telephone your

nominated X-Stream Service Centre, as shown on the inside front cover

of this guide.

If the fault is with your International KiloStream private circuit, please

ring the number provided in your customer handover information.

When you ring, you’ll need to give the following information:

• the circuit reference number, which you’ll find on the cover of your NTU

• the name and telephone number of the person in your company whom

we can contact while the fault is being traced; when the line is clear,

we will inform the same person

• a description of the fault.

14


Operating guide

BT X-Stream Service Centres are manned by specialist staff who have

access to computer-aided facilities to speed the handling of any problem

with your KiloStream private circuit; these facilities include access to

alarm information.

The X-Stream Service Centre staff will keep you informed of progress

made towards restoring your service, and will report back to you when

service has been restored.

You can report a problem at any time of the day or night, seven days a

week, 365 days a year.

If you report a a problem outside normal office hours (0900 to 1700,

Monday to Friday), you will need to state if access to your premises is

available outside normal office hours.

Note: X-Stream Service Centre staff don’t have test access to equipment beyond your NTU,

nor can they provide diagnostic information about equipment beyond your NTU.

15


Offices worldwide

The telecommunications services described in this publication

are subject to availability and may be modified from time to time.

Services and equipment are provided subject to British

Telecommunications plc’s respective standard conditions of contract.

Nothing in this publication forms any part of any contract.

BT and the BT logo are trademarks of British Telecommunications plc.

© British Telecommunications plc 2003

Registered office: 81 Newgate Street, London EC1A 7AJ

Registered in England and Wales No: 4190816

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