Service Manual

SRM9000 SERIES SERVICE MANUAL

Hash (#) digits These digits are used for two purposes:

• For Selcall identities (encode and decode) - known as User Id digits. These digits

are replaced by the user id entered at switch on (if enabled)

• Use in DTMF dialled strings - their use is network dependent to access special

services.

IDENT A 13 bit number used for Identification purposes. Associated with a Prefix (PFIX)

this forms a 20 bit address which is used for identification purposes in signalling

between the radio and the trunking system.

Identity Name given to a sequence of tones which is used in sequential tone signalling.

See Valid Selcall Digits.

Idle State The state of the radio when it is not in a call.

Inaccessible A state of a channel such that it is unavailable to the user through normal methods

of channel selection. Therefore inaccessible channels will not appear on the

channel menu.

Include Calls these types of calls are used to allow a 3rd party to join into an existing call.

Link Establishment A delay incorporated into the start of every selective call or DTMF transmission

Time which allows for the finite delay of the radio equipment in responding to any radio

signal. This includes both the commencement time of the originating transmitter

and the response time of the receiver.

Locked A state of a channel whereby it is not possible to change channels using the

normal up/down keys on the channel menu until the OK key is pressed. See Auto

Channel Selection Lock.

MEP Miniaturisation Extent Parameter. Used in systems that use ANN numbering.

Modifier Part of a dialled string that modifies the nature of the call made to a number (e.g.

dialling "*9" before the number that is to be dialled will modify the call to be an

emergency call).

MPT1327 A signalling standard for Trunked Private Land Mobile Radio Systems. Defined for

systems in the UK but also used outside the UK. Issued January 1988.

MPT1343 A System Interface Specification for commercial Trunking networks. Defined for

systems in the UK but also used outside the UK. Issued January 1988.

Noise Blanker A circuit designed to reduce automotive ignition interference.

NDD Network Dependent Data. This is a field within the CCSC codeword that is used by

the trunking system to identify information about the trunking network and, in

particular, information specific to the site that is radiating the control channel. It is

used by the radio when it is acquiring a control channel to identify valid channels.

Null Id A Selcall identity that is not defined and whose tones' field is displayed as a blank.

Open A state where transmit and receive are allowed. The channel is no longer open

when reset. Contrast with Closed.

Normally an Open channel would not have Selcall Mute and PTT Inhibit would be

disabled.

OPID Network Operator Identity used in Regional Systems. See Roaming.

PABX Private Automatic Branch Exchange.