Product Listing
Answer Supervision-Line Side (AS-LS) - V8.0
Product Description
Answer Supervision-Line Side (AS-LS), an Open Network Architecture (ONA) product, functions on outgoing calls placed by the end-user on an IntraLATA basis.
AS-LS provides the capability to deliver on-hook (idle) and off-hook (in use) supervisory signals from the terminating Central Office (CO) to a line interface (Customer Premise Equipment (CPE)) at the originating end of the call.
DMS™-10 and DMS-100 CO switches and 5ESS® CO switches use a battery reversal method to provide the AS-LS signaling. The electrical signal is sent to the calling station indicating the called party has answered the call. The CO switch provides battery reversal on the talk pair when the called party has answered the incoming call and this battery reversal condition continues for the duration of the call.
This feature may be used by terminal equipment (Private Branch Exchange (PBX), pay telephone, call diverter, and other compatible types of Customer Provided Equipment (CPE)) connected to the calling line to determine that the call has been answered.
The disconnect timer returns the line to an idle or normal state upon termination of the call by the called party. This timer provides the only indication to the originating end that the called party has terminated the call. This disconnect timer has a lengthy time-out interval and is not affected by the provisioning of AS-LS on the line. This interval may be too long when used with equipment that may depend on short intervals.
To provide end-to-end continuity, the line equipped with AS-LS (the calling party) must be provisioned over metallic facilities (loops).
Metallic facilities:
- May be loaded or non-loaded
- May have a resistance zone of 1500 to 2800 ohms (this zone is computed by using the distance from the CO and the size of wire the service is provided on) and will normally require a range extension devise for battery boost and transmission gain. Most loops of this length already have this device in place and will not need to be added to provision AS-LS.
AS-LS can not be disabled on a call by call basis.
AS-LS is available with:
- All Basic Public Access Lines (PAL), e.g. Resale Basic PAL
- Certain Feature Group A (FGA) services
- All Non-designed PBX trunks, e.g. Resale PBX
- Single party non-designed Business and Residence Plain Old Telephone Service (POTS), e.g. Resale POTS or CenturyLink Local Services Platform™ (CLSP™) Business and Residential
AS-LS is not available with the following services:
- Any type of exchange access service utilizing a "trunk side" interface
- Coin Line or Smart PAL Service
- Designed services such as Foreign Exchange Service, Foreign Central Office Service or designed PBX trunks.
- Direct Inward Dial (DID) Trunks
- FGA in the 5ESS switch
- Party Line Service
- Wide Area Telecommunication Service (WATS)/800 Service
The following table lists whether or not AS-LS signaling is generally available based on switch type and serving area:
| Switch Type | Serving Area | Company | AS-LS Feature Availability |
| 5ESS | Local | Lucent | Yes |
| DMS-10 | Local | Nortel | Yes |
| DMS-100 | Local | Nortel | Yes |
AS-LS is only available on local loop copper facilities without pair gain systems. Pair Gain equipment manufacturer channel units used in currently deployed CenturyLink pair gain systems are not capable of providing the AS-LS function.
The following table lists whether or not AS-LS signaling is generally available based on Class of Service and switch type:
| Class of Service | 5ESS | DMS-100 (3) | DMS-10 |
| Automatic Number Identification (ANI) 6 Service |
Yes |
Yes |
Yes (1) |
| ANI 7 Service |
Yes |
Yes |
No |
| Centron® Flat and Measured |
Yes |
No |
Yes |
| Custom Local Area Signaling Services (CLASS™) |
No |
Yes |
Yes |
| Custom Calling Services (BRCS in 5ESS) features |
No |
Yes |
Yes |
| Digital lines |
No |
No |
No |
| Hotel/Motel Flat and Measured Local Trunks Guest or Administrative. |
Yes (2) |
Yes |
Yes (1) |
| Line-Extension bridging |
No |
Yes |
Yes |
| PBX Non-designed Flat and Measured Trunks |
Yes |
Yes |
Yes (1) |
| Shared analog lines |
No |
No |
No |
| Single Party Flat Business or Residence |
Yes |
Yes |
Yes |
| Single Party Measured Business or Residence |
Yes |
Yes |
Yes |
(1) Loop start only
(2) Any optional features provisioned on the trunk will not function after the battery reversal signal is received.
(3) A special line card is necessary for generation of the AS-LS (line reversal). The NT6X18AB standard line type card and NT2X8AD line card can produce the AS-LS line reversal signal.
When calls are placed to 0, 0+, or 911:
| 5ESS | DMS-10 and DMS-100 |
| An immediate false AS-LS signal is returned as soon as Operator or 911 is dialed. | A signal, real or false, may or may not be returned depending on the specific office configuration. |
Unless the CPE is equipped with polarity guard, the touchtone pad will be disabled when the AS-LS battery reversal signal is received. Applications which require signals to be provided via a touchtone pad after the call has been answered will not be possible for the end-user unless their CPE contains the polarity guard feature.
Product technical information can be found in the following:
- CenturyLink Technical Publication 77336.
- Telcordia Generic Requirements (GRs)/Technical References (TRs)/Special Reports (SRs) TA-NPL-00912 Compatibility Information for Telephone Exchange Service
Availability
Additional information on can be found in the Pre Ordering Overview.Availability is based on LATA by product and switch type.
AS-LS is available where facilities exist throughout CenturyLink QC.
Information is available in the state specific Tariffs/Catalogs/Price Lists.
Rates and/or discounts are available in Exhibit A or the specific
Compatibility & Restrictions
| Feature/Service | Rules/Restrictions | ||
| Optional Feature | DMS-100 | DMS-10 | 5ESS |
| Call Forwarding | Compatible | Not Compatible | Not Compatible |
| Call Transfer | Not Compatible | Compatible | Not Compatible |
| Call Waiting | Compatible | Not Compatible | Not Compatible |
| Ground Start | Compatible | Not Compatible | Compatible |
| Hunting Lines | Compatible | Compatible | Compatible |
| Individual Speed Call | Compatible | Not Compatible | Not Compatible |
| Integrated Services Digital Network (ISDN) | Not Compatible | Not Compatible | Not Compatible |
| Loop Start | Compatible | Compatible | Compatible |
| Message Desk Service | Not Compatible | Not Compatible | Not Compatible |
| ONA Hot Line | Not Compatible | Not Compatible | Not Compatible |
| ONA Warm Line | Not Compatible | Not Compatible | Not Compatible |
| Party Line Service | Not Compatible | Not Compatible | Not Compatible |
| Remote Register | Not Compatible | Not Compatible | Not Compatible |
| RMT | Not Compatible | Compatible | Not Compatible |
| Three Way Calling | Not Compatible | Not Compatible | Not Compatible |
| Toll Divert | Compatible | Not Compatible | Limited Compatibility
Local Only |
| Feature Group A (FGA) Switch Access Service | Limited compatibility
|
||
| When line equipped with ANI7 on DMS-100 | Limited compatibility
End-user's will no longer have the availability of:
|
||
Pricing
Rate Structure
AS-LS may have a recurring and a nonrecurring charge based on state specific Tariffs/Catalogs/Price Lists and apply per line and are billed in addition to the rates and charges for the associated service.In Iowa nonrecurring charges associated with AS-LS are billed instead of Business Service Charges.
Rates
Retail rates for this feature can be found in the state specific Tariffs/Catalogs/Price Lists.
Rates and/or discounts are available in Exhibit A or the specific .
Rates and/or discounts for this feature when ordered with Interconnection and Resale services are available in Exhibit A or the specific rate sheet in your Interconnection or Resale Agreement.
Rates and/or discounts for this feature when ordered with Commercial Solutions products (e.g. CLSP) are available in the Rate Sheet of your Master Services Agreement (MSA).
Ordering
Ordering Rules
Additional information on ordering can be found in the Ordering Overview.Feature Activity Types (Action Codes)
The valid Feature Activity Types are:- D = Disconnect
- N = Add
NOTE: When changing from one feature to another, use N and D Feature Activity Types.
Feature Codes (USOCs)
Answer Supervision — Line Side is identified by the following USOCs:
| Product | Feature |
| Answer Supervision | |
| PAL |
AS8LX |
| POTS |
AS8LX |
Feature Detail (FID and Data Requirements)
Adding AS-LS
This feature is ordered by including:- Feature Activity Type N and the appropriate USOC from the Feature Codes table
Removing AS-LS
This feature is removed by including:- Feature Activity Type D and the appropriate USOC
Last Update: March 17, 2015
Last Reviewed: October 16, 2023
5ESS® is a Registered Trademark of Lucent Technologies,
Inc.
Centron®, CenturyLink Local Services Platform® (CLSP™) and CLSP™ are Registered Trademarks of CenturyLink Communications International Inc.
CLASS™ is a Trademark of iconectiv®.
DMS™ is a Trademark of Nortel Networks