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Digital Clock Distributor Dcd-400, Dcd-St2, and Dcd-Cim General Description and Specifications

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Digital Clock Distributor Dcd-400, Dcd-St2, and Dcd-Cim General Description and Specifications TELECOM TMSL 097-40000-55 SOLUTIONS Issue 2: Nov 94 DIGITAL CLOCK DISTRIBUTOR DCD-400, DCD-ST2, AND DCD-CIM GENERAL DESCRIPTION AND SPECIFICATIONS CONTENTS PAGE Tables Page 1. GENERAL . 1 A. Card Quantities (Maximum) . 6 B. Modular Mounting Panel Output Kits . 11 2. INTRODUCTION . 2 C. System Specifications . 16 D. Card Specifications . 18 3. DESCRIPTION . 3 A. Master Shelf . 3 B. Input Reference Signals . 3 1. GENERAL C. DCD-ST2 and DCD-400 . 3 D. DCD-CIM . 4 1.01 This practice provides descriptions, specifica- E. System Expansion . 5 tions, and typical applications for the Digital Clock F. Output Panels . 10 Distributor (DCD) family of products. G. System Power . 12 H. System Diagnostics and Protection 1.02 This practice has been reissued due to editori- Switching . 12 al changes. No change bars are used. 4. APPLICATIONS . 12 1.03 Information common to the DCD-ST2 and A. DCD Applications . 12 DCD-400 Systems is referenced as “DCD”. The B. SCIU Applications . 13 DCD-ST2 is referred to as the “ST2” System, and the DCD-400 as the “400” System. Information unique 5. SPECIFICATIONS . 16 to the DCD-CIM System is referenced as “CIM”. Un- less otherwise specified by direct reference, other in- Figures formation is common to all systems. 1. DCD-ST2 Master Shelf . 7 1.04 The Synchronization Monitor System (SMS) 2. DCD-400 Master Shelf . 8 may be installed in the DCD Systems to implement 3. DCD-CIM Master Shelf . 8 DS1 performance monitoring. For details regarding 4. DCD System Configuration . 9 the installation and operation of the SMS option, in- 5. Wire-wrap Output Panels . 10 cluding the Communications Unit (CMU) and Syn- 6. Modular Mounting Panel . 11 chronization Monitor Unit (SMU) cards, refer to 7. Modular Mounting Panel Output Kits . 11 TMSL 097-40000-11, and TMSL 097-40000-12. 8. Typical DCD Applications . 14 9. SCIU Applications . 15 1.05 The optional Maintenance Interface (MI) card provides an enhanced local and remote monitoring Copyright 1992–1994 Telecom Solutions All rights reserved. Printed in U.S.A. Page 1 Thi d t t d ith F M k 4 0 4 TMSL 097-40000-55 Issue 2: Nov 94 interface. The MI card works in conjunction with an SCIU Synchronous Clock Insertion Unit card Alarm Interface Adapter (AIA) card to connect alarm SMS Synchronization Monitor System inputs from the expansion shelves and clock status SMU Synchronization Monitor Unit leads from the DCD shelf to the MI card. The AIA SONET Synchronous Optical Network also provides an RS-232 communications port. Refer ST2 Stratum-2 clock to TMSL 097-40000-26 for details regarding the in- ST2E Enhanced Stratum-2 clock stallation and operation of the MI and AIA cards. ST3 Stratum-3 clock ST3E Enhanced Stratum-3 clock 1.06 The optional SCIU Alarm and Monitoring TIE Time Interval Error (SAM) card provides a monitoring function to alert TOxA Timing Output card office personnel of removed SCIU cards that may af- TOAA Timing Output Analog Automatic card fect customer service. TOCA Timing Output Composite Clock Auto- matic card 1.07 The following abbreviations are used in this TOLA Timing Output Logic Level Automatic document: card TOTA Timing Output DS1 Automatic card ACO Alarm cutoff TSG Timing Signal Generator ACI Analog Clock Input card AI Alarm Interface card AIS Alarm Indication Signal 2. INTRODUCTION APS Automatic protection switching B8ZS Bipolar with 8 Zero Substitution 2.01 The Digital Clock Distributor (DCD) system BITS Building Integrated Timing Supply provides a means of implementing the Building Inte- CC Composite Clock card grated Timing Supply (BITS) concept within a build- CI Clock Input card ing containing telecommunications digital CIM Clock Insertion and Monitor System equipment connected to the telecommunications dig- CMU Communications Unit ital network. The BITS concept advocates the estab- COFA Change of Frame Alignment lishment of a single master timing supply per CPE Customer Premises Equipment administrative building, which provides a common D4 DS1 Superframe format clock source for frequency and phase synchroniza- DCD Digital Clock Distributor tion to network elements (NE) necessary for digital DCS Digital Cross-connect System cross-connectivity and transport. DDS Digital Data System DS1 Digital Signal, level 1 (1.544 Mb/s) 2.02 The BITS has the highest quality clock within DSX-1 Digital Cross-connect level 1 a building. It is directly referenced from a Stratum- ESF Extended Superframe format 1 local primary reference (LPR) or an upstream Stra- FA Fuse and Alarm card tum-1 via the interoffice synchronization distribu- FDM Frequency division multiplex tion network. The BITS distributes all timing HS Hot spare card (frequency and phase) required by other clocks with- LOS Loss of signal in that building. LPR-L3 Local Primary Reference-Loran 3 MCA Matrix Controller Automatic card 2.03 The stratum clock cards within the DCD mas- MCA-2 Matrix Controller Automatic-2 card ter shelf provide long-term averaging of the input MI Maintenance Interface card reference to the DCD. If the input is disrupted or is MTIE Maximum Time Interval Error out of tolerance, the DCD clock cards provide the NE Network Element necessary bridge in timing (holdover) and allows the OOF Out of frame network to continue to operate slip-free for several PBX Private Branch Exchange hours or days depending on the stratum quality of RTZ Return-to-zero the clock cards installed. Page 2 Issue 2: Nov 94 TMSL 097-40000-55 2.04 The DCD regenerates a clocking signal from 3.03 If unprotected outputs are desired, or if the its input reference and buffers the short term timing shelf is to be equipped with only synchronous clock variations, and generates a variety of output signals insertion (SCIU) cards, then output protection cards required by the NEs, e.g., framed all-ones DS1, 64 (hot standby cards and MCA/MCA-2) should not be kb/s composite clock (CC), various analog frequen- installed. All TOx (x = 1 to 10), HS TOC and HS TOT cies, and various RS-422/RS-423/RS-232 frequen- card slots can be cabled as unprotected output slots. cies. NEs timed from the DCD system permits unrestricted DS0 cross-connection between NEs. B. Input Reference Signals 2.05 The output cards of the DCD system provide 3.04 Input signals are arranged in pairs and desig- distribution of timing signals for channel banks, dig- nated A (primary) and B (secondary). Input refer- ital switches, digital loop carrier (DLC), digital ence signals can be: cross-connect systems (DCS), SONET OC-n termi- nals, ISDN equipment, digital radio, FDM carrier, • DS1 from an upstream Stratum-1 reference or PBX systems and other devices that interconnect LPR-L3 with the telecommunications digital network. • Composite clock (CC) from an existing office clock 2.06 The DCD system when equipped with Stra- tum-2 clock cards can accept input references from • 16.384-MHz composite clock from a #4ESS digi- Telecom Solutions DCD-LPR (Local Primary Refer- tal switch ence) system equipped with a GPS (Global Position- ing System) and/or LORAN-C receivers traceable to • 2.048 MHz from a DACS II Universal Coordinated Time (UTC). The combina- tion of the DCD and DCD-LPR provide a local Stra- 3.05 For ST2 or ST2E clocks, the incoming DS1 ref- tum-1 source. erence must be of Stratum-2 or better quality. For ST-3 or ST-3E clocks, the reference must be of Stra- tum-3 or better quality, as defined in ANSI-T1-101. 3. DESCRIPTION 3.06 DS1 or CC input reference signals can be ac- 3.01 The DCD system consists of the DCD-ST2, cepted by the CI card. DCD-400 and DCD-CIM shelves and various input, clock, output, output protection switching and 3.07 Input reference signals from the DSX-1 to the alarms cards. The shelves may be installed as a mas- DCD can be terminated in 100 ohms (–20 dB signals) ter shelf or as expansion shelves. A full system of a or bridged (0 dB signals) by the built-in bridging re- master and three expansion shelves has either 34 peater in the CI card. This allows the system to be lo- (DCD-ST2 master) or 40 output card slots capable of cated up to 655 feet from the DSX-1. CC input up to 340 (DCD-ST2 master) or 400 timing output reference signals to the DCD are terminated in 133 signals. The system is modular design and permits ohms. incremental growth of a shelf and/or an output card at a time. C. DCD-ST2 and DCD-400 A. Master Shelf 3.08 The ST2 operates at Stratum-2, Stratum-2E, Stratum-3, or Stratum-3E stability, and the 400 at 3.02 All DCD systems must have a master shelf Stratum-3 or Stratum-3E stability. In freerun or equipped with an output panel. The master shelf ac- holdover modes, either unit can act as the office clock cepts input references, contains the clock cards, and in a BITS environment or as a free-running clock provides clocking to the expansion shelves. It also source. contains timing outputs, output protection switch- ing, and alarm and maintenance interfaces. Page 3 TMSL 097-40000-55 Issue 2: Nov 94 3.09 Up to three expansion shelves can be installed • TOAA: Analog (sine wave) in the ST2 or 400; the 400 can be used as an expan- sion shelf for the 400 and the ST2 master shelves; • TOLA: RS-422/RS-232/RS-423 (TTL) the ST2 cannot be used as an expansion shelf. 3.12 For retiming DS1 systems, SCIU cards may be System Components used with the DCD System.
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