BT ISDN Technické informace stáhnout pdf (Strana 20)

need to refer to your Internet Service Provider for

advice. This will probably involve re-configuring your

access application (typically Dial-up Networking). You

should also remember that a 128k digital call is

treated as two calls and you will be charged as such.

Q. How can I tell if I have been disconnected from

a call?

A. Most phone systems and Group 4 fax machines

provide a straightforward method for indicating call

status. In order to avoid paying for unnecessarily long

calls, you should familiarise yourself with how each

device displays whether or not a call is connected.

When using computers, ask your ISDN Card or

Terminal Adapter supplier how your software

indicates call status.

Q. How do I get extension wiring?

A. BT can install digital (‘S’ Bus) extension wiring for an

additional charge. Alternatively, you can buy a wiring

extension in kit form from other suppliers and install

it yourself. The cabling must be Category 5 compliant,

conform to ISO/IEC 11801 and be fitted with RJ45

type plugs. Please refer to ‘ISDN Extension wiring’ on

page 12 for details of how to connect extension wiring.

Q. Can I use Select Services on ISDN 2e?

A. No. Select Services, such as Call Sign, Call

Minder and Call Diversion, cannot be used with

ISDN 2e. However, a range of comparable Digital

Select Services, such as Call Forwarding, Call Barring

and Calling Line Identity (CLI), are available. Digital

Select Services are controlled and activated by your

equipment, be that an ISDN phone, phone system,

Terminal Adapter, Router or ISDN card, therefore you

must ensure that your equipment supports Digital

Select Services and is configured correctly.

Answering your

questions

Q. Can I use ISDN 2e straight away?

A. You can plug Group 4 fax machines, ISDN phones and

videoconferencing terminals into either socket on

your ISDN 2e box and once configured, use them

straight away. To connect a computer, you’ll need a

properly configured ISDN Card or a Terminal

Adapter. These are available from BT and other

suppliers and cost from around £50 for an internal

device and from around £100 for an external one.

You’ll also need to check that your Internet Service

Provider supports digital access. On top of that, you’ll

have to configure your software to make ISDN calls.

If you’re connecting a digital phone system to ISDN 2e,

you’ll need to refer to the documentation that came

with your PBX and/or consult your supplier.

Q. How many calls can I make at any one time?

A. Two. You can make two simultaneous digital voice

calls, two data calls or one digital voice call and one

data call.

Q. How many digital phones, computers and other

devices can I attach to the line at once?

A. Eight, any two of which can be used simultaneously.

To use analogue phones, faxes, answering machines

and modems, you’ll need an ISDN Terminal Adapter

with analogue ports. These are available from BT and

other suppliers from around £150.

Q. What is channel bonding?

A. This is the option to combine your two 64k ISDN 2e

channels to create a speedy digital link operating at

128k. If you want to do this over the Internet, you’ll

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