BT ISDN Technické informace stáhnout pdf (Strana 13)

Diagram 1c

If just one terminal is to be connected to the linebox,

it may be up to 800m from the linebox. In this case,

the L/S switch should be set to L.

Note.

ISDN sockets look similar to ordinary phone sockets but the plugs

and other wiring accessories are not interchangeable.

Caution

It is very important to operate the L/S switch only

when there are no terminals in use, as this could

result in data corruption or the call being lost. Do not

alter the position of the IN/OUT switch when any

terminal is in use, because this could result in data

corruption or the call being lost.

L/S switch

The ISDN 2e linebox incorporates a switch marked

L/S, which enables you to select the appropriate

mode of operation, depending on the wiring

configuration you have chosen.

• For one or two terminals plugged directly into

the linebox, with no extension wiring, select S.

• When using extension wiring up to 150 metres in

length overall from the linebox, select S.

• When using Medium or Long extension wiring

between 150 and 800 metres in length overall

from the linebox, select L.

In/Out switch

The ISDN 2e linebox incorporates a switch marked IN

and OUT which enables you to select the correct

operating conditions, depending on the wiring

configuration you have chosen.

• If no extension wiring is connected switch to IN.

• If there is extension wiring connected, switch to

OUT.

It is essential that the switch is repositioned in this

way whenever the extension wiring is connected or

disconnected even temporarily.

Usage tips

• It is very important you check that your dial-up

software, or router, is not set-up to make

unnecessary multiple short calls. You can view

the cost of calls made since your last bill by

visiting www.bt.com/billing-payments. We advise

that you do this soon after your equipment has

been connected to ISDN 2e. BT will not refund

call charges raised due to incorrectly configured

equipment. If you do require your equipment to

make lots of short calls then why not consider

our Reduced Minimum call fee discount

scheme (see page 10).

Terminal Wire colour code Function

1. White/orange band Power source 3

2. Orange/white band Power source 3

3. White/green band Transmit

4. Blue/white band Receive

5. White/blue band Receive

6. Green/white band Transmit

7. White/brown band Power sink 2

8. Brown/white band Power sink 2

Table 1. Terminal connections for extension wiring.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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