w2_sub__admn.pdf

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SILVER CERTIFICATION COURSE DIGITAL SWITCHING SYSTEM

SUBSCRIBER ADMINISTRATION

Version 2 June 2014

Digital Switching Systems (DSS) Subscriber Administration

EETP / BSNL Silver Certification Course /Ver.02/June2014 Page 1 of 12

For Restricted Circulation

SUBSCRIBER ADMINISTRATION

INDEX

3.1 Objective ..................................................................... 2

3.2 Introduction ................................................................ 2

3.3 Subscriber Line Management ................................... 2

3.4 Subscriber Classes Of Services ................................. 7

3.5 Summary ................................................................... 11

3.6 Self Assessment Questions ....................................... 11




3 SUBSCRIBER ADMINISTRATION

STRUCTURE

3.1 OBJECTIVE

3.2 INTRODUCTION

3.3 SUBSCRIBER LINE MANAGEMENT

3.4 SUBSCRIBER CLASSES OF SERVICES

3.5 SUMMARY

3.6 SELF ASSESSMENT QUESTIONS

3.1 OBJECTIVE

The objective of this lesson is to

Understand the activities followed by the exchange administration in the

management of Subscriber like creation , modification and deletion

3.2 INTRODUCTION

Administration of a telephone exchange involves such day-to- day operations as

putting new subscriber lines into service, modifying subscriber's entitlements, transfer of

a subscriber line and taking a subscriber line out of service. In the same way the

connectivity with other exchanges in the network is al maintained for efficient working of

the exchanges. These operations come under the per view of administration of subscriber

lines , trunks and routes. These administration tasks involve dialogues between the

operators and the switching system.

Thus a large part of the operators' work involves the use of MML commands to

administer subscriber data stored in the exchange. By administration of data we mean

their creation, modification and deletion in exchange memory, as well as obtaining their

output to man-machine dialogue and storage peripherals.

3.3 SUBSCRIBER LINE MANAGEMENT

Each subscriber is identified by a directory number and a Terminal Equipment

Number. Other data related to subscriber line comprise of its status, line characteristics,

subscriber characteristics and subscriber facilities.




Fig1. Connectivity of subscriber

When bringing a new subscriber in service, for example, an operator must inform

the exchange of the line equipment used, the assigned directory number, the subscriber's

class of service, etc. (Assuming line wires have been connected to the line circuit at the

MDF.) This transmission of information between operating personnel and the switching

system is carried out through VDUs, using a special man- machine language (MML).

The data describing subscriber characteristics consist of

subscriber's priority for service during congestion;

the type of observation to be made related to calls over the line; (including malicious calls),

the type of metering;

extent of billing details to be provided to subscriber;

permissibility of interception by operator of all incoming calls;

level of access permitted for outgoing and incoming calls;

permissibility of operator accessing the subscriber.

In addition to the above, originating and terminating facilities data denote the

optional services for which the subscriber has registered. This indicates the facilities for

which the subscriber is entitled to as calling or called party respectively.

They refer to facilities like

Automatic alarm,

Hotline,

Conference, etc.

For certain facilities, additional data is stored, in the form of destination directory

number for diversion of calls, time of alarm etc.

(i) Line Characteristics

Data associated with lines describing the functional, physical and electrical

characteristics

Line Type

Instrument Type

MDF pillar

r

EXCHANGE

Subs

Premises

LU

Internal External

Jumpering Jumpering

Wall DP




Line Category

Cable Identity

Access option

a) Line Type

Functional type of the line. For example, Ordinary Line, Coin Collection Box

Line, Private Automatic Branch Exchange Line etc.

b) Instrument Type

Type of telephone equipment used by the subscriber. It may be of the following

types: Decadic, DTMF or Digital.

c) Line Category

A number assigned to a line depending on the electrical characteristics of the

external plant for the line. This number points to a set of "expected value ranges" for a

set of line testing parameters and thus, system uses the number when lines are "tested" to

decide if the line is behaving "normally" or if the measured values are beyond the range,

line could be suspected to be faulty.

d) Cable Identity

Identity of the outdoor plant cable to which the line is connected. It is a

combination of :

Primary Cable Identity

Secondary Cable Identity

Tertiary Cable Identity

e) Access Option

This parameter which all access options are active. For PSTN subscriber, its

value should be NRML. Indicates which all access options are active. This is valid for

ISDN sub. Only.

(ii) Subscriber Characteristics

Data associated with subscribers describing certain class of service entitlements

Subscriber Priority (SUB-PRI)

Mode of Incoming Call (CAL-MOD)

Detailed Billing (DET-BLG)

Metering Class (MTR-CLS)

Access Barring (ACC-BAR)

Subscriber Category (SUB-CTG)

Operator Access (OPR-ACC)

Basic Service Supported (BS)

Selection Mechanism for B Channel (B-SELECT)

Max. no. of B channels (CHNL-BS)

Max. no. of calls per BS (CALL-BS)




a) Subscriber Priority (SUB-PRI)

Certain subscribers in an exchange may be given a preference over other

lines, such that they are not denied service during congestion. The lines

may be given a service which other non priority lines are denied at that

time.

b) Metering Class (MTR-CLS)

Data associated with the metering facilities available to a subscriber.

i) Check meter (CHK-MTR)

The subscriber may be entitled to have a check meter (operating on 16KHz

metering pulses sent by the exchange) at his premises which is operated

whenever his meter in the exchange is incremented. However, check meter

is not incremented at subscriber premises when subscriber is charged for

certain supplementary services.

ii) Type of metering

The subscriber may be entitled to the following types of metering

Metered normally (NRM-MTR)

Reverse Metered where the subscriber is charged for calls received by

him. Currently not implemented. Non Metered (NO-MTR) where the

originator of call is not charged.

d) Detailed Billing (DET-BLG)

Denotes the extent of billing details requested by the subscriber

Detailed Billing for directly dialled long distance calls only

(National and International Calls

Detailed Billing even for non long distance calls

e) Call Mode (CAL-MOD)

Describes whether all incoming calls to the subscriber will be intercepted by an operator at the local exchange, for providing assistance in allowing

only such calls to mature as are really meant for current subscriber of the

telephone numbers and filtering out other calls.

f) Access Barring (ACC-BAR)

Denotes the level of access to outgoing & incoming call on a particular

BS to a subscriber.

The different level of access to outgoing calls may be: Completely OG

barred, only 10x calls allowed, upto Local, regional, National,

International calls allowed or No outgoing call allowed.

The level of access for incoming calls to the subscriber may be : all calls

barred or all calls allowed.

The basic services is the third parameter which defines the above mentioned access barring is for which basic service. Subscriber can have

different level of access barring for different basic services.




g) Subscriber Category

This parameter defines the category of the subscriber. A subscriber can

have category ranging from 1 to 64. This parameter helps in charging of

different subscriber in different way.

h) Basic Services

This parameter describes the bearer services offered to the subscriber. Services are

BS12 means 3.1 KHz Audio and speech

BS13 means 64 kbps unrestricted

BS12 3 means 3.1 KHz audio & speech and 64 kbps unrestricted.

3.3.1 Creation:

The first in-servicing (creation) of an individual subscriber line involves issuing a

man-machine command, after the line has been connected at MDF. By this a relationship

between a free (unassigned) directory number and a free Equipment Number is

established. Further, the appropriate line characteristics, subscriber characteristics and

facilities are registered. At the same time, a charge meter is assigned and its contents are

output as part of the output report. Later, whenever there is any change in the subscriber's

line characteristics, like the instrument is changed from decadic type to DTMF type, the

existing data can be modified through a command.

3.3.2 Modification

Similarly, if any of the subscriber's characteristics undergoes a change, like the

line has to be put under observation for malicious calls, there is a command to modify this

data.

When the subscriber avails different optional facilities (value added phone

services) like Alarm, Hotline etc., at any time it may be registered through a command to

modify the currently availed facilities. The subscriber's directory number may be

modified, through a command. In this case the line will retain the current equipment

number. The line will be automatically put in frozen state, with the option to specify the

mode of interception of calls to the previous number.

The equipment number may be modified through a separate command, and may

be used when the subscriber changes his residence, but likes to keep his current directory

number unchanged..

3.3.3 Safe custody

Customers, who do not intend to use their landline connection for more than three

months period and want to ensure that their line is not misused in their absence, can avail

the Safe Custody Plan at very nominal charges:

The safe custody charges will be a fixed amount per month .The charges will be paid in advance.

The phone connection will be disabled for the period of safe custody.

Telephone number will be retained and will be restored after the period of safe custody on the request of customer.

The minimum period of safe custody will be three months in BSNL Network.




When the subscriber is shifting premises and temporary suspension of service is

required, the line may be deleted with provision to feed announcement for calls to the

deleted number. In this case, the logical relationship between directory number and

equipment number is broken and the equipment number is free to be re-assigned. But the

directory number remains assigned, but without any characteristics or facilities. For

permanent cancellation of service, the command to modify the announcement mode may

be executed with option to feed NU Tone for calls to this number. Then, the directory

number becomes frozen, automatically and may be re-used after unfreezing. Permanent

cancellation may also be done while deleting, by choosing option to feed NU Tone,

instead of announcement.

A) Shifts are of the following types:

Within the same exchange area

From one exchange area to another exchange area in Multi-Exchange areas

All India Shift

Shifts within Same Telephone System :

At any time with in the same exchange area.

If Telephone has worked at least for 18 months in respect of NON-OYT

connections (This scheme is open to all in BSNL) in the original exchange area or the

date of registration for the connection to be shifted is prior to the release date of new lines

of the specific category in the required exchange.

Application for shift to be made in prescribed form

B) Shifts on all India basis

Permissible if the telephone has worked for at least 18 months in respect of NON-

OYT connection in the original exchange area or the date of registration for the

connection to be shifted is prior to the release date of new lines of the specific category in

the required exchange.

C) Shifting Charges

External shifting of LL/BB plan @Rs. 300/- per shift and Name transfer charges

@ Rs.200/- per occasion introduced

3.4 SUBSCRIBER CLASSES OF SERVICES

a) Call Forwarding

Call forwarding is a feature that may be assigned to a subscriber during

setup or upon subsequent application. It allows calls that are destined for one subscriber

(B1 called party) to be forwarded to another directory number(B2 called party).




Fig2. Call Forwarding

Three main different types of call forwarding are available:

Call forwarding immediately

All calls to the B1 called party are forwarded to the B2 called party regardless of

the status of B1. The B1 called party may still make outgoing calls.

Call forwarding on busy

All calls to the B1 called party are forwarded to the B2 called party if the B1

directory number is busy.

Call forwarding on no answer

All calls to the B1 called party are forwarded to B2 called party if the B1

called party does not reply within a specified time.

Call forwarding is usually activated and deactivated by the

operator. If a subscriber wishes to use this service (subscriber input), proper authorization

may be granted by the operator. Canceling the authorization and deactivating the

diversion has no effect on an existing diverted call.

A call can be diverted several times. The maximum no. of call diversion in

a series is set by exchange administrator:

Only one call can be diverted from a subscriber line at one time. Any

further calls directed to this B1 subscriber are given busy tone.

1. The exchange must be authorized to grant the use of call forwarding

features to a subscriber through Subscriber Controlled Feature :Feature can have value(s)

diversion on busy, diversion immediately, diversion on no reply.

EWSD

B1Called

party

B2 called party or

operator

Or

recorded announcement

requested connection forwarded connection

A Calling party




2. The subscriber must be authorized to use the feature. This allows the

subscriber to modify the system data, i.e. the B2 directory number: The feature may also

be controlled by the operator instead of the subscriber:

b) Traffic Restrictions in the Outgoing Directions

This feature allows a subscriber to prevent all outgoing calls or all calls to

a specific direction or to a specific zone from being made from his or her telephone. The

feature covers the following Service restrictions in the outgoing direction, fully

administration controlled. Service restrictions in the outgoing direction, administration

registration, subscriber controlled. Service restrictions in the outgoing direction, fully

subscriber controlled and selected.

c) Three Party Conference Service

Three party service with three way conversation feature enables the subscriber to hold an existing connection while setting up another to a third subscriber.

With this feature it is possible to:

Switch between the first and second connection

End one of the connections and retain the other

Set up a common speech path between all three subscribers

A calling party (A-SUB) with this feature can put his partner into waiting position

and sets up another call to a different subscriber. This is called three party CALL status The A-SUB establishes a three party conference from three party CALL status by

performing a hook flash and dialing 3 after special dial tone. If either of the two called

parties (B-SUB or C-SUB) go on hook during an active three party conference they are

released individually. If the A-SUB goes on hook, the complete three party conference is

released.

d) Malicious Call Identification Feature

The malicious call identification (MCI) features allow the origin of

malicious calls to be identified. The malicious call identification service is activated via

the subscriber classes of services. The following options are available:

Call Identification unconditional

Malicious call data is saved for all incoming calls after call set-up has been

completed.

Call identification on request

Malicious call data is only saved if the called party activates identification

during call set up (e.g. by performing a hook flash).None of the possible options stated

above of MCI cause blocking of the calling or the called partys line. Both subscribers can be accessed for both incoming and outgoing calls immediately after an MCI

connection. Functions involved in malicious call identification If the called party has

been assigned the malicious call identification class of service, malicious call data will be

generated either automatically or upon request. This data record may contain the

following:




date, time of the day.

directory number information and associated directory numbers.

calling party or called party trunk group number.

calling party or called party line number.

calling party or called party circuit identification code (CIC) and, as additional information, network indicator (NI) and signaling point code

(SP code) where there is networking with CCS7 signaling links.

e) STD barring facility

To provide dynamic STD facility to the subscribers, first the feature has to be

created in the exchange. For authorizing this feature to the subscriber, another MML

command will be used If a subscriber asks for only local dialing facility then this

command will be used with specific parameter: If a subscriber wants only STD facility on

his telephone then the command will be used with another specific parameter If a

subscriber complaints that his telephone has been locked permanently then the exchange

administrator may use a proper MML commands used for resetting the locked code .

f) Administrative Blocking/BNP disconnection and reconnection

To block a subscriber administratively a proper MML command is used

with appropriate parameter. The blocking may be of following types:

Account suspension originating

Account suspension terminating

Account suspension (all calls blocked)

Administrative Blocking

3.4.1 INTERROGATION OF SUBSCRIBER.

The MML command (Exchange specific) will display the characteristics

of subscriber, like category, line attributes and other class of services which are assigned

to the subscriber. The command can also be used to display the data of more than one

subscriber also.

3.4.2 CANCELATION OF A SUBSCRIBER

The command will cancel the subscriber with the DN. The result of the

command will also display the charge meters of the canceled subscribers without

subscriber features. It is also known as deletion.

DELETION OF SUBSCRIBER: When the command is issued to delete a subscriber, the information

concerning a subscriber is deleted.

No communication possible using this line. Calls made to this line diverted to an operator or announcement or fed NU

tone




Directory number frozen Terminal equipment free for allotment Output directory number and equipment number Output current equipment charge meter reading

3.5 SUMMARY

This unit gives detailed information about subscriber related data which need to

be provisioned in the exchange database by means of man machine commands. The

creation , deletion , modification of subscribers has been told . Various classes of service

to the subscribers has also been dealt in this chapter.

3.6 SELF ASSESSMENT QUESTIONS

1. Each subscriber is identified by a .. and a Terminal Equipment Number.

2. Subscriber's priority for service during congestion can be one of the data describing subscriber characteristics.(T/F)

3. The creation of an individual subscriber line involves issuing a man-machine command, after the line has been connected at MDF .( T/F)

4. Whenever there is any change in the subscriber's line characteristics the existing data can be ..through a command.

5. The minimum period of safe custody will be months in BSNL Network..

6. Shifts on all India basis is not allowed .(T/F) 7. List the three types of Call forwarding. 8. Traffic Restrictions in the Outgoing Directions can allow a subscriber to

prevent all outgoing calls .(T/F)

9. In a Three Party Conference Service the subscriber can switch between the first and second connection .(T/F)

10. The malicious call identification (MCI) feature allows the . of malicious calls to be identified.( origin/destination)

w2_sub__admn.pdf

Documents

management of subscriber

subscriber data

subscriber characteristics

connectivity of subscriber

subscriber line management

subscriber facilities

new subscriber lines

subscriber classes of