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ISDN30 (Integrated System Digital Network, 30 channel)

A ‘primary rate’ ISDN line can carry the equivalent of up to thirty simultaneous

calls. In UK, a ‘primary rate’ ISDN line is called ISDN30.

This is a digital telephone line that conforms to the international ISDN standard.

It can carry up to 30 simultaneous telephone calls. This type of digital teltephone

line normally connects directly to a PABX telephone exchange. See Fig 13.

Note that the CS0700 ISDN-Analogue converter is for ISDN2 lines not ISDN30.

ISDN2 Home & Business Highway

Fig 15

Home Highway, Business Highway (continued)

In the event of mains failure, the right-hand analogue telephone socket on the

NTE9 will cease to operate but all other functions are powered from the ex-

change equipment. It is important therefore to connect Dualcom to the left-hand

analogue telephone socket on the NTE9. See Fig 15.

A maximum of two calls on an NTE9 may be in progress at the same time. Use

of one analogue telephone socket constitutes one call. Use of the S-Bus on

either S-Bus socket constitutes one or two calls (64 or 128 K byte bandwidth).

If two calls are in progress it is impossible to make another outgoing call or

receive another incoming call.

The ‘two call maximum’ means that if either of the S-Bus sockets are being

used and a telephone call is in progress on one analogue socket, then anybody

ringing into the other analogue telephone socket will get a ‘busy’ signal. Equally

any connection to the other analogue socket, e.g. a telephone at the user’s

premises, will not hear the dialling tone and will not be able to dial out. Note that

an over-ride ‘line grab’ facility does not exist on an NTE9.

Refer also to the ‘safety Earth’ and the ‘Call Minder’ sections.

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Connect Systems CS1001 Manual de Instalação Página 28