Glossary

ADSL

Asymmetric Digital Subscriber Line. Commonly referred to as broadband, this is a type of broadband used to connect to the internet. ADSL allows more data to be sent over existing copper telephone lines, when compared to traditional modem lines. A special filter, called a micro filter, is installed on a subscriber's telephone line to allow both ADSL and regular voice (telephone) services to be used at the same time.

Aux

Auxiliary Lines are Multi Lines that provide a single phone number across a group of between two and 200 lines. They let incoming calls be routed to the first available line or be routed cyclically using all the lines in the group in turn. It supports more than one incoming or outgoing call simultaneously and offers a residential or business telephone directory listing.

Bearer

Bearer is what the line and equipment an ISDN30e is delivered over.

BIS

‘Bring Into Service’ is the final step on an ISDN30e New Provide order where Openreach will bring the circuit into service. This is actioned after the installation work has been completed.

Block Terminal

Block Terminals are used for security to run an alarm line through. These are normally installed by Openreach though are not maintained by Openreach. An NTE should be fitted before the Block Terminal as this is a demarcation point for testing.

Care Level Agreement

Care Level Agreements range from 1 to 4 and Openreach aim to respond to faults within the timescale allocated within the care level.

CDTA

‘Conscious Decision To Appoint’ is an acronym to confirm that the customer is aware of potential charges if an engineer attends the site and proves that there is no fault with the line.

Channels

Channels are found on ISDN systems and the amount of channels will indicate the number of calls that can be made at any one time.

CLIP

‘Calling Line Identity Presentation’ allows the customer to receive and display the calling party’s line identity (CLI or telephone number) before answering the call. The called party will only receive this information if the caller has no restricted the sending of their number and if they have subscribed to the CLIP service. Also known as ‘Caller Display’ on PSTN or analogue lines

CLIR

‘Calling Line Identity Restriction’ allows a customer to restrict their calling line identity (CLI) to not be displayed at any time. This can also be done on a "per call" basis by dialling the "1470" prefix before making a call

Contact

This is vital for raising any fault. The engineer should ring ahead to the contact and they should be present when the engineer attends the site to confirm that the line is working. It is important that the contact is always someone on site

CPE

‘Customer Premises Equipment’ is equipment belonging to the customer on site (e.g. PBX, Telephone, Fax Machine etc.).

CPS

‘Carrier Pre Select’ is a way of routing calls on behalf of a customer over a particular communications provider. This is done at the exchange, so no codes are needed to be dialled.

DDI

‘Direct Dial Inward’ is an extension on an ISDN system. These are physical lines internally after the main socket.

Demarcation Point

Demarcation Point is where Openreach will maintain the line to. This is typically an NTE or NTTP socket on the wall. This is where testing should be performed before raising a line fault.

DP

‘Distribution Point’ is the point at which single telephone lines are taken from a bundle to a premise.

Driver Circuits

When there are multiple orders for the same customer or premise (regardless of product type PSTN, ISDN2, ISDN30), the first order that is built on the Openreach system become what is commonly known as a driver circuit/lead order. If any line plant work is required to be completed to provide the services, all the work is completed and associated charges are applied to the driver circuit/lead order and as the order progresses all other secondary orders for the customer/premise would also progress in conjunction with the driver circuit/lead order. However, should the driver circuit/lead order be cancelled all associated work and charges would transfer onto the secondary order. Also should any delays be encountered with the driver circuit/lead order, it would also affect the progress of the secondary orders and will continue to be delayed until it has been resolved on the driver circuit/lead order. Finally, if the driver circuit/lead order is with another service provider the customer would need to contact the concerned service provider as we are unable to obtain any order information due to the Data Protection Act.

Dual Tone

Dual Tone is a line that supports both Pulse and Tone dialling

ECCs

‘Excess Construction Charges’ are raised when additional infrastructure is required to provide new or extended service at a customer’s site.

ERT

‘Estimated Response Time’ is when Openreach schedule to attend a site to attempt to clear a fault.

ESF

‘Exchange Service Features’ are features added to the line at the exchange to provide additional services for a customer. An example of this is Call Divert CLI Presentation

Fault Location

‘Fault Location’ is an indicator as to where a potential fault may lie. Different engineers deal with different locations on a fault

ISDN2 Digital Standard

Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. ISDN2 Digital Standard can have a maximum of two channels and up to nine multiple subscriber numbers.

ISDN2 Digital System

Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. ISDN2 Digital Systems have a maximum of 5 slots (including the main number) for DDIs and SNDDIs. The ranges can be anything from 10 to 2000 if needed in each slot and the 5 slots can be any variation of DDIs or SNDDIs.

ISDN30

Integrated Services Digital Network (ISDN) 30 and ISDN2 are almost identical functionality wise. ISDN2e is supplied in multiples of two lines which can be expanded further in multiples of two, but each expansion requires an engineer’s visit and system programming (2 weeks lead time). If you require 6 lines or less on your telephone system and it is likely that this figure will not increase, then ISDN2e will usually suffice. However, for larger organisations or, if you intend to expand your telecoms operation in the future then the correct solution is probably an ISDN30e as these can be installed with minimum of 8 channels and a maximum of 30 which is a significant increase over the ISDN2. ISDN30 have a maximum of 5 slots (including the main number) for DDIs and SNDDIs. The ranges can be anything from 10 to 2000 if needed in each slot, and the 5 slots can be any variation of DDIs or SNDDIs.

Jumpers

A Jumper is a piece of equipment located at the exchange which connects the line at the MDF.

KCI

‘Keeping the Customer Informed’ are alerts sent from Openreach to keep us informed on the progress of the order and its updates.

Lead Fault

When a common fault has been identified, a Lead Fault is then placed. This is where all the current updates are added to regarding the fault's progress.

Line Plant