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.
