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Product Brief September 2000
Digital Jitter Attenuation (DJA) Controller
Introduction
The digital jitter attenuator controller is a macrocell block that is extractable from the TMXF28155 Super Mapper application-specific standard product (ASSP). The DJA controller contains 28 DJA blocks. Each DJA block can operate in two different modes, as a DS1 or an E1 jitter attenuator. In both modes, the DJA blocks can be provisioned to operate as a second-order phase-locked loop (PLL) always, or it can switch to act as a first-order PLL during virtual tributary (VT) pointer adjustments to help meet MTIE requirements. The block will also insert the proper alarm indication signal (AIS) if the primary block AIS control input is active. The PLL bandwidth can be set over a wide range to accommodate a number of different system constraints.
Features
The DJA block accepts/delivers DS1/E1 clock, data, and AIS indications from/to the cross connect block.
s
AIS will cause the correct AIS clock to be inserted, and the AIS indication will be passed back to the cross connect. The DJA blocks operate in the second-order PLL mode under normal conditions. The DJA blocks can be provisioned to enter the first-order PLL mode following VT-level pointer adjustments. The period of time in the first-order mode is provisionable via registers. The PLL bandwidth is provisionable between 0.1 Hz and 0.5 Hz. The damping factor for these bandwidths varies between 2 Hz and 0.5 Hz.
s
s
Figure 1 shows the DJA block with I/O connections to other blocks within the Super Mapper device.
MICRO INTERFACE
CONTROL
XC_JDATA[28:1] XC_JCLK[28:1] XC_JPTRADJ[28:1] XC_JAIS[28:1] DIGITAL JITTER ATTENUATOR CROSS CONNECT DJA_CLK[28:1] DJA_DATA[28:1] DS1_AISCLK E1_AISCLK
E1_XCLK DS1_XCLK
5-8955 (F).a
Figure 1. DJA Block with I/O Connections to Other Blocks in the TMXF28155 Super Mapper
Digital Jitter Attenuation Controller
Product Brief September 2000
Functional Block Diagram of the DJA Block
The functional view of the DJA block, along with interconnections to the other blocks within the Super Mapper device, are shown in Figure 2. The DJA block interfaces only to the cross connect and microprocessor interface blocks within the Super Mapper device. The input interface between the DJA block and the cross connect block consists of clock, serial data, VT pointer adjustment indication, and AIS insert indication. The output interface consists of clock, serial data, and AIS insert indication, as well as the DS1 and E1 AIS clocks for use by other blocks within the device.
XC_JAISx XC_JCLKx XC_JDATAx XC_JPTRADJx DS1_XCLK E1_XCLK
DJA_CLKx JITTER ATTENUATION BLOCK DJA_DATAx DJA_AUTOAISx
BLOCK REPEATED 28 TIMES AIS CLOCK GENERATION DS1_AISCLK E1_AISCLK
0409 (F)
Figure 2. Basic Functional Flow of the DJA Block
For additional information, contact your Microelectronics Group Account Manager or the following: http://www.lucent.com/micro, or for FPGA information, http://www.lucent.com/orca INTERNET: docmaster@micro.lucent.com E-MAIL: N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P. R. China Tel. (86) 21 6440 0468, ext. 325, FAX (86) 21 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot), FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 3507670 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
Copyright (c) 2000 Lucent Technologies Inc. All Rights Reserved
September 2000 PB00-106NCIP

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