Qwest Communications International Inc. Technical …

1 Qwest CommunicationsInternational PublicationQwest DS3 Service Technical Specifications For DS3 Electrical Network ChannelInterfaces Network Channel and Network Channel Interface CodesDescribing Interfaces at Customer Premises and at QwestCentral Offices, including Radio Interfaces Central Office Multiplexer Options Copyright 1993, 2001, 2005 77324 Qwest Communications International FAll Rights ReservedJanuary 2005 Qwest Tech Pub 77324 NoticeIssue F, January 2005 Throughout this publication, the term Qwest signifies Qwest Communications International purpose of this document is to describe Qwest DS3 service. Sufficient Technical detail isfurnished to enable a customer to select options and channel interfaces suitable for theirapplication needs. This document describes the Technical features of the offering.

2 It s not theintent of this document to provide ordering information beyond specific, available NetworkChannel and Network Channel Interface reserves the right to revise this document for any reason, including but not limited to,conformity with standards promulgated by various governmental or regulatory agencies;utilization of advances in the state of the Technical arts; or to reflect changes in the design ofequipment, techniques, or procedures described or referred to to anyone arising out of use or reliance upon any information set forth herein isexpressly disclaimed, and no representation or warranties, expressed or implied, are made withrespect to the accuracy or utility of any information set forth document is not to be construed as a suggestion to any manufacturer to modify or changeany of its products, nor does this publication represent any commitment by Qwest to purchaseany specific products.

3 Further, conformance to this publication does not constitute a guarantee ofa given supplier's equipment and/or its associated information for Qwest Publications can be obtained from the Reference Section of further information is required, please contact: Qwest Communications International W Mineral , CO 80120E-Mail: Tech Pub 77324 CommentsIssue F, January 2005 COMMENTS on PUB 77324 PLEASE TEAR OUT AND SEND YOUR COMMENTS/SUGGESTIONS TO: Qwest Communications International W Mineral , CO 80120E-Mail: from you helps us to improve our Publications. Please take a few moments toanswer the following questions and return to the above this Publication valuable to you in understandingthe Technical parameters of our service?YES _____ NO _____Was the information accurate and up-to-date?

4 YES _____ NO _____Was the information easily understood?YES _____ NO _____Were the contents logically sequenced?YES _____ NO _____Were the tables and figures understandable and helpfulYES _____ NO _____Were the pages legible?YES _____ NO _____If you answered NO to any of the questions and/or if you have any other comments orsuggestions, please explain:_____(Attach additional sheet, if necessary)Name _____ Date _____Company _____Address _____ _____Telephone Number _____E-Mail _____Qwest Tech Pub 77324 Table of ContentsIssue F, January 2005 TOC-iCONTENTSC hapter and Section .. For of Channel Elements .. Interface CT Capacity .. Interface CT TC Element .. Service Configurations .. Customer Premises-to-Customer Premises Channel.

5 Customer Premises-to-CO Hub Channel .. Hub-to-CO Hub Multiplexing Feature (CO Multiplexing).. With 8-Zero Substitution (B8ZS) Impact on DS3 Multiplex Channelsignal .. Customer Responsibility When Ordering DS1 CC Hub U S WEST Responsibility for Ordered DS1 CC HubMultiplexing of Interfaces .. Electrical Interface and Frame Format Applications .. Frequency Interface for Multiplexed DS3s .. Network Interface Unit .. Loopback Loopback Operation ..3-4 Table of ContentsQwest Tech Pub 77324 Issue F, January 2005 TOC-iiCONTENTS (Continued)Chapter and Channel (NC) and Network Channel Interface (NCI) code Function .. DS3 Interface NCI code Options .. Interface NCI code code Form and code NCI code Components .. code Function.

6 code Components and Form .. Used to Order DS3 Service .. NC and NCI Codes - General .. and NCI code Combinations for AsynchronousDS3 Service .. of End-to-End Objectives .. Objectives .. Objectives .. Objectives .. Performance .. Interface Timing Jitter Specifications .. Protection Switching .. Responsibilities ..7-2 Qwest Tech Pub 77324 Table of ContentsIssue F, January 2005 TOC-iiiCONTENTS (Continued)Chapter and .. Documents .. Documents .. National Standards Institute (ANSI) Documents .. Ordering ..8-2 Figures2-1 DS3 Channel Elements .. 2-12-2 Electrical Interface CT Capacity ..2-22-3 Radio Interface Capacity Transport Channel Element ..2-42-5 Customer Premises-to-Customer Premises Channel ..2-52-6 Customer Premises-to-CO Hub Channel.

7 2-52-7 CO Hub-to-CO Hub Hub Multiplexing Carrier Premises - DSX-3 Cross-connect Panel Interface ..3-23-2 EU Premises Electrical DS3 - SJA44 Network Interface Electrical DS3 NCI code Radio NCI code Example ..4-3 Tables3-1 DS3 Loopback FEAC Codes ..3-54-1 Multiplexed Asynchronous DS3 Radio Frequency Interfaces NCand NCI Codes ..4-44-2 NC Codes for Electrical DS3 Channels ..4-54-3 DS3 Electrical Interface NCI Codes ..4-74-4 NC and NCI code Combinations .. 4-75-1 Long Term Accuracy Objectives ..5-25-2 Availability Objectives ..5-2 Qwest Tech Pub 77324 Chapter 1 Issue F, January 2005 IntroductionTOC 1-iCONTENTSC hapter and .. for 1-1 Qwest Tech Pub 77324 Chapter 1 Issue F, January document describes Qwest DS3 Service, its Technical interface specifications, NetworkChannel (NC) and Network Channel Interface (NCI) code combinations.

8 This TechnicalPublication provides sufficient Technical details for a customer to select a service forincorporation into an end-to-end Communications document provides the electrical DS3 interface specifications, and their NC and NCI codecombinations. Also, it provides code combinations permitting DS3 service to be ordered usinghigher bit rate channels with Central Office (CO) multiplexing down to the DS3 rate. The latterincludes Radio Network Interfaces. The document describes: Required characteristics of DS3 signals at the interface with customers at End-User (EU) andCarrier premises. NCI codes used to describe the signal characteristics of the interfaces. NC codes used to order DS3 for Reissue Add DS3 Network Interface Unit (NIU) Carrier Remote Loopback Tech Pub 77324 Chapter 2 Issue F, January 2005 Description of ServiceTOC 2-iCONTENTSC hapter and of Channel Elements.

9 Interface CT Capacity .. Interface CT TC Element .. Service Configurations .. Customer Premises-to-Customer Premises Channel .. Premises-to-CO Hub Channel .. Hub-to-CO Hub Multiplexing Feature (CO Multiplexing).. With 8-Zero Substitution (B8ZS) Impact on DS3 MultiplexChannel Customer Responsibility When Ordering DS1 CC HubMultiplexing Responsibility for Ordered DS1 CC HubMultiplexing Channel Elements ..2-12-2 Electrical Interface CT Capacity ..2-22-3 Radio Interface Capacity Channel Element ..2-42-5 Customer Premises-to-Customer Premises Channel ..2-52-6 Customer Premises-to-CO Hub Channel ..2-52-7CO Hub-to-CO Hub Multiplexing Tech Pub 77324 Chapter 2 Issue F, January 2005 Description of of ServiceQwest DS3 service consist of a high capacity channel for the transmission of Mbit/sisochronous serial data having a line code of Bipolar Three Zero Substitution (B3ZS).

10 QwestDS3 service is offered to Carrier and End-User (EU) customers in the following configurationsand multiplexing arrangements: Customer Premises-to-Customer Premises DS3 Channel Customer Premises-to- Qwest Central Office (CO) Hub DS3 Channel Qwest CO Hub-to- Qwest CO Hub DS3 Channel Qwest CO DS3 Multiplexing to Channel ElementsDS3 Channel Elements may consist of one or more of the elements shown in Figure 2-1 below:SERVING COSERVING COIN TEROFFICE FACILITIESXXXXNINICTCTTCC ustomerLocationCustomerLocation Qwest NETWORKQWESTQWESTF igure 2-1: DS3 Channel ElementsWhere: CO = Central Office NI = Network Interface CT = Channel Termination (NI to serving CO link) TC = Transport Channel (Transmission facilities between serving COs, between a serving CO and a Qwest CO Hub, or between Telephone Company Hubs)Chapter 2 Qwest Tech Pub 77324 Description of ServiceIssue F, January 20052-2 Network Interface (NI) signals may be electrical or radio, as selected by the customer.