AT&T Technical Reference 41458 (October 1996)
TR 41458, October 1996
Special Access Connections to the AT&T Network
Scope
AT&T Technical Reference (TR) 41458 provides a description of the various special access interfaces at the AT&T point of termination (POT) for AT&T services.
TR 41458 is not a Customer Premises Equipment (CPE) requirements document, although some of the material may affect CPE design objectives. Since the boundaries of AT&T services are the AT&T points of termination, TR 41458 applies only to the signals crossing the interfaces at those points. In addition to the interface specifications, some CPE guidelines are included as an aid for CPE vendors.
TR 41458 describes the special access connections of CPE to an AT&T Action Point (ACP). Switched access (i.e., access which is routed through a Local Exchange Carrier’s central office switch) is not covered in detail, but is mentioned. Interface specifications for private switched services, such as Enhanced Private Switched Communication Systems (EPSCS) and Common Control Switching [1] . The Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) interface specifications are provided in AT&T Technical Reference TR 41459 [2] , and are not covered in TR 41458. However, TR 41459 refers to TR 41458 for information concerning transmission levels.
Organization
Section I contains general and introductory matter, as well as a glossary of terms and acronyms. Also included in Part I are descriptions of various access services, features and dialing plans.
Section II contains information regarding access interface to an Action Point (ACP). Only the behavior of the interface at the point of termination is described.
Section III contains recommendations for CPE designers, based on certain assumptions about probable access arrangements (LEC, CPA, etc.) which connect CPE to an ACP. If these assumptions are not appropriate (e.g., if customer-provided access arrangements are used), some sections of Part III may not be applicable. More detailed information on access arrangements is contained in AT&T Technical Reference TR 62210 [3] .
Services
AT&T switched services are those services which are offered under FCC Tariffs 1, 2, 4, 9, 11 and 12. The AT&T switched nodal services within the scope of TR 41458 are Software Defined Network (SDN), Software Defined Data Network (SDDN), Software Defined Data Network International (SDDN-I), MEGACOM®, Toll Free MEGACOM®, Switched Digital Services (SDS), Switched Digital International (SDI), Long Distance Service (LDS), Alternate Egress Arrangements, Toll Free Multimedia Service, Universal T1.5 Access and MultiQuest®.
Special access facilities, which extend from the customer’s premises to the AT&T service node, must be obtained independently of the nodal service. Special access can be obtained through one of the following arrangements:
- The customer may request AT&T Total Service. Under this arrangement, AT&T will arrange for the access facilities for service to the customer premises, which falls under the auspices of Tariff 11. Advantages to the customer include (a) AT&T-engineered access, (b) end-to-end service support from AT&T, (c) a single point of contact for maintenance, and (d) a single bill.
- The customer may request AT&T Access Coordinated Service. Under this arrangement, AT&T performs all of the functions as with AT&T Total Service except that the customer receives the bill for the special access facilities directly from the Local Exchange Company.
ISDN Vendor testing program is currently suspended
1. AT&T, Interface Specifications for Voice Grade Common Control Switching Arrangement (CCSA) and Enhanced Private Switched Communication Services (EPSCS), Technical Reference PUB 43252, October 1987.
2. AT&T Integrated Services Digital Network (ISDN) Primary Rate Interface and Special Application Specification User-Network. Interface Description, Technical Reference TR 41459, August 1996.
3. AT&T, Access Connections to Baseline Offerings at AT&T Central Offices, Technical Reference 62210, May 1985.