Telecommunications - Configuration of X.25 Networks

Subscription Option - Extended Packet Sequence Numbering

Subscription Option - D-bit modification

Subscription Option - Packet Retransmission

Subscription Option - Incoming Calls Barred

Subscription Option - Outgoing Calls Barred

Subscription Option - One-way Logical Channel Outgoing

Subscription Option - One-way Logical Channel Incoming

Subscription Option - Nonstandard Default Packet sizes

Subscription Option - Nonstandard Default Window sizes

Subscription Option - Default Throughput Classes Assignment

Subscription Option - Flow control Parameter Negotiation

Subscription Option - Throughput Class Negotiation

Subscription Option - Closed user group

Subscription Option - Closed user group with Outgoing Access

Subscription Option - Closed user group with Incoming Access

Subscription Option Incoming Calls Barred within a closed user group

Subscription Option Outgoing Calls Barred within a closed user group

Subscription Option - Fast Select Acceptance

Subscription Option - Reverse Charging Acceptance

Subscription Option - Local charging prevention

Subscription Option - Network User Identification

Subscription Option - Network User Identification override

Subscription Option - Charging information

Subscription Option- RPOA Selection

Subscription Option - Hunt Group

Subscription Option - Call redirection

Subscription Option - call deflection subscription

Subscription Option - TOA/NPI address subscription

Subscription Option - Direct Call


CCITT X.2 L3 Subscription Options


Subscription options are those options which apply to your line on a long term basis.

When requesting a UK line, the customer would normally fill in an application form which allows the customer to choose the options.

This information is entered into the network management computers using a number of 'table build programs'. These 'tables' are then loaded into the network so that the network will operate in accordance with the users requirements.

These options will then continue to remain in force unless overridden by new Table build information. The subscription options cannot be changed directly by the customer.

CCITT have specified a number of subscription options in a standard called X.2. These options are listed in section 3 with information about the degree of support for these features offered in Suppliers equipment.


Subscription Option - On-line facility registration

Description of Option

This facility will be supported on X.25 dial (X.32) lines only.

This facility, if subscribed to, permits the DTE to request registration of facilities or obtain current values of facilities. This is done by means of registration request packets and registration confirmation packets.

For the X.25 dial (X.32), the interface will allow DTE identification, When the X.25 dial (X.32) interface receives a registration request packet carrying the identification information of the DTE, which includes a network username and password, and if it is valid the X.25 dial (X.32) interface will provide the identified DTE service for this switched access link.

This facility is not supported on UK(a).

The following support is provided on UK(b) from release 5:

CCITT on-line registration facility req pkt ind pkt UK support
Extended packet sequence numbering ¹ ¹ no
D-bit modification ¹ ¹ no
Packet retransmission ¹ ¹ no
incoming calls barred facility ¹
Outgoing calls barred facility ¹
One way logical channel outgoing
One way logical channel incoming
Non-standard default packet sizes ¹ ¹
Non-standard default window sizes ¹ ¹
Default throughput class assignment ¹ ¹
Flow control parameter negotiation ¹ ¹
Throughput class negotiation ¹
Fast select acceptance ¹
Reverse charging ¹ no
Reverse charging acceptance ¹ ¹
Local charging prevention ¹ no
Charging information (per interface) ¹ ¹ no
(per call) ¹ no
RPOA subscription fs fs no
selection ¹ no
Transit delay selection and indicat ¹ no
Allocation of logical channel range ¹ ¹

key:

= supported by UKb

¹ = allowed by CCITT

fs = for further study by CCITT

X.2 LEVEL 3 PER USER SUBSCRIPTION OPTIONS X.2 (1984) UK(a) UK(b) interworking
REF CLASS now now R5a R5b R6
On-line facility registration....... 1.25 A . .
On-line facility registration....... 1.25 A . .


Z4i - initiating on-line facility registration.. P = Prohibited

Z4r - response to on-line facility registration.. -

Therefore release 4 is compatible with ONA for this option.

Test plan and implementation issues

None - since its not supported.

If it is supported in future releases we would have to work out how to charge for it.


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