公开(公告)号：EP0166461A3

公开(公告)日：1987-05-20

申请号：EP85108976

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B20/10 ,  G11B05/09 ,  G11B05/596 ,  G11B21/10

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: A method for writing a clock track on a magnetic storage medium of a disc system comprising a fixed read/write head, at least one moving read/write head, and means for translating the magnetic storage medium relative to the fixed and the moving heads, whereby information may be written on the medium in the form of magnetic transitions and the magnetic transitions may be read with the fixed and the moving heads, includes the steps of writing a single pair of transitions with the fixed heads, selecting a predetermined number N of transition pairs for a clock track, reading the single pair of transitions to create a single initial electrical pulse, phase-lock looping the initial electrical pulse to a number of electrical pulse to a number of electrical pulses approximately equal to the square root of N, writing an intermediate clock track with the moving head, the intermediate clock track having a number of transition pairs equal to the square root of N, reading the intermediate clock track to create a number of intermediate clock electrical pulses equal to the square root of N, phase-lock looping the intermediate clock electrical pulses to a number of electrical pulses equal to N and writing a clock track with the fixed head having N transition pairs.

公开(公告)号：EP0166461A2

公开(公告)日：1986-01-02

申请号：EP85108976.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B20/10 ,  G11B5/09

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: A method for writing a clock track on a magnetic storage medium of a disc system comprising a fixed read/write head, at least one moving read/write head, and means for translating the magnetic storage medium relative to the fixed and the moving heads, whereby information may be written on the medium in the form of magnetic transitions and the magnetic transitions may be read with the fixed and the moving heads, includes the steps of writing a single pair of transitions with the fixed heads, selecting a predetermined number N of transition pairs for a clock track, reading the single pair of transitions to create a single initial electrical pulse, phase-lock looping the initial electrical pulse to a number of electrical pulse to a number of electrical pulses approximately equal to the square root of N, writing an intermediate clock track with the moving head, the intermediate clock track having a number of transition pairs equal to the square root of N, reading the intermediate clock track to create a number of intermediate clock electrical pulses equal to the square root of N, phase-lock looping the intermediate clock electrical pulses to a number of electrical pulses equal to N and writing a clock track with the fixed head having N transition pairs.

Abstract translation: 一种用于在包括固定读/写磁头，至少一个移动读/写磁头以及用于相对于固定磁头和移动磁头转换磁存储介质的装置的盘系统的磁存储介质上写入时钟轨迹的方法， 由此信息可以以磁转换的形式写在介质上，并且可以用固定磁头和移动磁头读取磁转变，包括以下步骤：将固定磁头写入一对转换，选择预定数量的N 用于时钟轨道的转换对，读取单个转换对以创建单个初始电脉冲，将初始电脉冲循环到多个电脉冲到大致等于N的平方根的多个电脉冲的数量， 用移动头写入中间时钟轨道，中间时钟轨道具有等于N的平方根的多个转换对，读取中间时钟 ck创建等于N的平方根的多个中间时钟电脉冲，将中间时钟电脉冲循环到等于N的多个电脉冲，并用具有N个转换对的固定头写入时钟轨道。

公开(公告)号：EP0095248A2

公开(公告)日：1983-11-30

申请号：EP83302307.0

申请日：1983-04-22

Applicant: NORTHERN TELECOM INC.

Inventor： Sims, Dewey M., Jr.

IPC: G11B15/06 ,  G11B15/16 ,  G11B15/08

CPC classification number: G11B15/16 ,  G11B15/06 ,  G11B15/08

Abstract: A switch assembly is provided for a tape drive adapted to receive a tape cartridge. The assembly comprises a housing, first and second switches fixedly mounted on the housing, and first and second plungers mounted for reciprocal movement on the housing to actuate the first and second switches, respectively. The housing includes three orthogonal reference surfaces, all of which engage the tape drive to locate the assembly in proper relationship to the tape drive. The plungers are responsive to the tape cartridge to actuate the first switch when the tape cartridge is properly mounted on the drive and to actuate the second switch when the tape cartridge is not write-protected. The assembly may include a light source and a tight-responsive switch which, together with a reflector in the tape cartridge, cooperate to detect position-indicating tape apertures.

公开(公告)号：EP0979583A2

公开(公告)日：2000-02-16

申请号：EP98920923.4

申请日：1998-04-27

Applicant: Northern Telecom, Inc.

Inventor： CHANG, Churui

IPC: H04Q7/36

CPC classification number: H04W16/12 ,  H04J13/0022 ,  H04J13/0074 ,  H04J13/16 ,  H04W16/02

Abstract: A method for configuring a spread spectrum cellular network for small-cell inclusion, by providing a finite series of PN-offsets, each PN-offset is separated by a constant value that is allotted to the spread spectrum cellular network (8). The finite series is portioned into a first and a second set. The second set subsequent to the first set and having sufficient PN-offset elements for a PN-offset reuse pattern having a plurality of cells (20), each cell having similar transmission characteristics. The second set is assigned to the PN-offset reuse pattern, deploying the cellular reuse pattern for a cellular network. Small cells (10) are insertable into the spread spectrum cellular network by assigning the first set to a PN-offset reuse pattern having a plurality of small cells (10) arranged in a small-cell reuse pattern, and deploying the small-cell reuse pattern. In another aspect, the method for configuring the spread spectrum cellular network involves sectoring each cell of the plurality of cells into a plurality of sectors. The sectored cells are assigned PN-offsets adjacent in the finite series together in each sector of the sectored cell while maintaining sufficient distance between cells that reuse an assigned PN-offset.

公开(公告)号：EP0084709B1

公开(公告)日：1987-02-11

申请号：EP82306357.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B5/58 ,  G11B21/10 ,  G11B5/012

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

公开(公告)号：EP0084709A1

公开(公告)日：1983-08-03

申请号：EP82306357.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B5/58 ,  G11B21/10 ,  G11B5/012

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: The system includes positioning means energizable for moving the read/write head to preselected recording positions relative to the disc and drive means for creating relative movement between the disc and the read/write head thereby enabling the transfer of data between the storage medium and the head. A plurality of servo tracks are embedded or recorded in servo data sectors on the disc for identifying preselected radial positions or informational data tracks on the disc. The servo data tracks are provided with a nonuniform radial track density. The track density of the servo tracks varies from more dense at the periphery of the disc to less dense at the interior of the disc. The radial track density of the servo data tracks is established with a method of writing embedded servo data that allows the unique performance characteristics of the moving read/ write head to determine the actual spacing of the tracks. A clock track is written by writing a single pulse on a fixed clock track head, phase-lock looping to an intermediate clock track, which is written on a moving read/write head, and then phase-lock looping up to the final clock track which is written on the fixed clock track head. Radial track density is then determined by moving one of the read/write heads to a limit stop and writing a reference track.

Abstract translation: 该系统包括能够将读/写头移动到相对于盘的预选记录位置的定位装置和用于在盘和读/写头之间产生相对移动的驱动装置，从而使得能够在存储介质和头之间传送数据 。 多个伺服磁道被嵌入或记录在盘上的伺服数据扇区中，用于识别盘上预选的径向位置或信息数据轨道。 伺服数据轨道具有不均匀的径向轨道密度。 伺服轨道的轨道密度从盘的周边处的密度更高，在盘的内部变为较不致密。 使用写入嵌入式伺服数据的方法来建立伺服数据磁道的径向磁道密度，这允许移动读/写磁头的独特性能特性确定磁道的实际间距。 通过在固定时钟轨道头上写入单个脉冲，将相位锁定循环到写入移动读/写头的中间时钟轨道，然后锁相环到最终时钟轨迹来写入时钟轨道 它写在固定时钟轨道头上。 然后通过将读/写头中的一个移动到限位停止并写入参考轨道来确定径向轨道密度。

公开(公告)号：EP0034938A3

公开(公告)日：1981-12-16

申请号：EP81300740

申请日：1981-02-23

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore Arthur

IPC: G11B05/58 ,  G11B21/10 ,  G11B05/55

CPC classification number: G11B5/5965

Abstract: An embodded servo track following system and method for positioning a transducer (10) relative to a storage medium (13) to read and write data on the medium such as a magnetic disc. The system includes positioning means (15) energizable for moving the transducer to preselected recording positions relative to the storage medium. A plurality of side-by-side closely spaced alternately arranged odd and even servo tracks are embedded or recorded on the medium such that a pair of the odd and even servo tracks identifies a preselected position or informational data track on the medium therebetween. Each of the odd and even tracks generates a waveform having a net DC component. The DC component of the odd and even tracks are equal in magnitude but opposite in polarity such that the DC components of the odd and even tracks cancel each other when the transducer is disposed therebetween. Servo control circuit means is provided for sensing the output of the transducer and selectively energizing the positioning means to null the output of the transducer and thereby centre the transducer between a preselected odd and even track pair (e.g. on line 36).

Abstract translation: 一种用于相对于存储介质（13）定位换能器（10）以在诸如磁盘的介质上读取和写入数据的体现的伺服轨道跟随系统和方法。 该系统包括可激励的定位装置（15），用于将换能器相对于存储介质移动到预选的记录位置。 多个并排紧密间隔的交替布置的奇数和偶数伺服磁道被嵌入或记录在介质上，使得一对奇数和偶数伺服磁道识别其间的介质上的预选位置或信息数据轨道。 奇数和偶数轨道中的每一个产生具有净DC分量的波形。 奇数和偶数轨道的直流分量的幅度相等，但极性相反，使得当换能器置于其间时，奇数和偶数轨道的直流分量相互抵消。 提供伺服控制电路装置，用于感测换能器的输出并选择性地激励定位装置以使换能器的输出为零，从而将换能器定位在预选的奇数和偶数轨道对之间（例如在线36上）。

公开(公告)号：EP0034938A2

公开(公告)日：1981-09-02

申请号：EP81300740.8

申请日：1981-02-23

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore Arthur

IPC: G11B5/58 ,  G11B21/10

CPC classification number: G11B5/5965

Abstract: An embodded servo track following system and method for positioning a transducer (10) relative to a storage medium (13) to read and write data on the medium such as a magnetic disc. The system includes positioning means (15) energizable for moving the transducer to preselected recording positions relative to the storage medium. A plurality of side-by-side closely spaced alternately arranged odd and even servo tracks are embedded or recorded on the medium such that a pair of the odd and even servo tracks identifies a preselected position or informational data track on the medium therebetween. Each of the odd and even tracks generates a waveform having a net DC component. The DC component of the odd and even tracks are equal in magnitude but opposite in polarity such that the DC components of the odd and even tracks cancel each other when the transducer is disposed therebetween. Servo control circuit means is provided for sensing the output of the transducer and selectively energizing the positioning means to null the output of the transducer and thereby centre the transducer between a preselected odd and even track pair (e.g. on line 36).

Abstract translation: 相对于embodded伺服磁道以下系统和方法，用于换能器（10）定位到一个存储介质（13），以在该介质上读取和写入数据：诸如磁光盘。 该系统包括定位装置（15）激励换能器移动到相对于所述存储介质预选记录的位置。 侧由端的多个紧密间隔的交替排列的奇数和偶数的伺服磁道被嵌入或之间记录在介质求做了一对奇数和偶数的伺服磁道的识别介质上的预先选定的位置或信息数据轨迹存在。 每个奇数的和偶数磁道基因率具有净直流分量的波形。 奇数和偶数轨道的DC分量在幅度上相等但极性相反检查做了奇和偶轨道的DC分量取消海誓山盟当换能器被布置在其间。 伺服控制电路装置被提供用于感测换能器的输出和选择地激励所述定位装置为零换能器的输出，并由此定心预选奇数和偶数之间的换能器跟踪对（例如在线路36上）。

公开(公告)号：EP0906705A2

公开(公告)日：1999-04-07

申请号：EP97931171.0

申请日：1997-06-13

Applicant: Northern Telecom Inc.

Inventor： RAM, Geetha, R. ,  SMITH, Kent, W. ,  LANDAU, Keith, W. ,  THOMPSON, Roger, L.

IPC: H04M3 ,  H04Q3

CPC classification number: H04M3/4228 ,  H04Q3/0029 ,  H04Q3/0037 ,  H04Q2213/1305 ,  H04Q2213/13103 ,  H04Q2213/13204 ,  H04Q2213/13336 ,  H04Q2213/13345 ,  H04Q2213/13349

Abstract: An apparatus and method for providing a telephone operating company with the ability to rapidly deploy advanced services into a public switched telephone network includes a programmable switch matrix, a service control unit (SCU), and a media resource unit (MRU). The call processing of a call (associated with one or more ports) on the programmable switch matrix is controlled externally by the service control unit (SCU) when particular triggering criteria is met (i.e., the call requires or desires control by the SCU). Call control processing is achieved through a high-speed communications link between the programmable switch matrix and the SCU using a communications protocol defining a comprehensive set of primitives (instructions) for call manipulation and control at the programmable switch matrix. The SCU executes different service application software programs that operate within the SCU for different types of service calls that are under the control of the SCU. The MRU interconnects between the SCU and the programmable switch matrix to provide voice processing and message capabilities for connection to a service call via the programmable switch matrix.

公开(公告)号：EP0095248B1

公开(公告)日：1989-12-13

申请号：EP83302307.0

申请日：1983-04-22

Applicant: NORTHERN TELECOM INC.

Inventor： Sims, Dewey M., Jr.

IPC: G11B15/06 ,  G11B15/16 ,  G11B15/08

CPC classification number: G11B15/16 ,  G11B15/06 ,  G11B15/08