Hitachi HUS157336EL3800 manual
- Consulta online o descarga el manual de instrucciones
- 46 páginas
- 0.3 mb
Ir a la página of
manuales de instrucciones parecidos
-
Computer Drive
Hitachi HTS543216L9A300
177 páginas 2.98 mb -
Computer Drive
Hitachi TAGMASTORE MK-90RD011-25
388 páginas 2.19 mb -
Computer Drive
Hitachi 7K750
2 páginas 0.28 mb -
Computer Drive
Hitachi IC35L090AVV2070
2 páginas 0.53 mb -
Computer Drive
Hitachi MK-96RD621-08
188 páginas 1.47 mb -
Computer Drive
Hitachi Z7K320
2 páginas 0.5 mb -
Computer Drive
Hitachi 13G1583
2 páginas 0.27 mb -
Computer Drive
Hitachi HUS157373EL3800
46 páginas 0.3 mb
Buen manual de instrucciones
Las leyes obligan al vendedor a entregarle al comprador, junto con el producto, el manual de instrucciones Hitachi HUS157336EL3800. La falta del manual o facilitar información incorrecta al consumidor constituyen una base de reclamación por no estar de acuerdo el producto con el contrato. Según la ley, está permitido adjuntar un manual de otra forma que no sea en papel, lo cual últimamente es bastante común y los fabricantes nos facilitan un manual gráfico, su versión electrónica Hitachi HUS157336EL3800 o vídeos de instrucciones para usuarios. La condición es que tenga una forma legible y entendible.
¿Qué es un manual de instrucciones?
El nombre proviene de la palabra latina “instructio”, es decir, ordenar. Por lo tanto, en un manual Hitachi HUS157336EL3800 se puede encontrar la descripción de las etapas de actuación. El propósito de un manual es enseñar, facilitar el encendido o el uso de un dispositivo o la realización de acciones concretas. Un manual de instrucciones también es una fuente de información acerca de un objeto o un servicio, es una pista.
Desafortunadamente pocos usuarios destinan su tiempo a leer manuales Hitachi HUS157336EL3800, sin embargo, un buen manual nos permite, no solo conocer una cantidad de funcionalidades adicionales del dispositivo comprado, sino también evitar la mayoría de fallos.
Entonces, ¿qué debe contener el manual de instrucciones perfecto?
Sobre todo, un manual de instrucciones Hitachi HUS157336EL3800 debe contener:
- información acerca de las especificaciones técnicas del dispositivo Hitachi HUS157336EL3800
- nombre de fabricante y año de fabricación del dispositivo Hitachi HUS157336EL3800
- condiciones de uso, configuración y mantenimiento del dispositivo Hitachi HUS157336EL3800
- marcas de seguridad y certificados que confirmen su concordancia con determinadas normativas
¿Por qué no leemos los manuales de instrucciones?
Normalmente es por la falta de tiempo y seguridad acerca de las funcionalidades determinadas de los dispositivos comprados. Desafortunadamente la conexión y el encendido de Hitachi HUS157336EL3800 no es suficiente. El manual de instrucciones siempre contiene una serie de indicaciones acerca de determinadas funcionalidades, normas de seguridad, consejos de mantenimiento (incluso qué productos usar), fallos eventuales de Hitachi HUS157336EL3800 y maneras de solucionar los problemas que puedan ocurrir durante su uso. Al final, en un manual se pueden encontrar los detalles de servicio técnico Hitachi en caso de que las soluciones propuestas no hayan funcionado. Actualmente gozan de éxito manuales de instrucciones en forma de animaciones interesantes o vídeo manuales que llegan al usuario mucho mejor que en forma de un folleto. Este tipo de manual ayuda a que el usuario vea el vídeo entero sin saltarse las especificaciones y las descripciones técnicas complicadas de Hitachi HUS157336EL3800, como se suele hacer teniendo una versión en papel.
¿Por qué vale la pena leer los manuales de instrucciones?
Sobre todo es en ellos donde encontraremos las respuestas acerca de la construcción, las posibilidades del dispositivo Hitachi HUS157336EL3800, el uso de determinados accesorios y una serie de informaciones que permiten aprovechar completamente sus funciones y comodidades.
Tras una compra exitosa de un equipo o un dispositivo, vale la pena dedicar un momento para familiarizarse con cada parte del manual Hitachi HUS157336EL3800. Actualmente se preparan y traducen con dedicación, para que no solo sean comprensibles para los usuarios, sino que también cumplan su función básica de información y ayuda.
Índice de manuales de instrucciones
-
Página 1
Drawing No. Sheet No. Revision 5 K660 2906 1 /46 2003 / 6 / 12 OEM Manual Hard Disk Drive Specifications Ultrastar 15K73-73/36 (SCSI) Models HUS157373EL3600 : ( 73GB/68pin) Models HUS157336EL3600 : ( 36 GB/68pin) Models HUS157373EL3800 : ( 73GB/80pin) Models HUS157336EL3800 : ( 36 GB/80pin) Hitachi Global Storage Technologies © 2003 , Hitachi Glob[...]
-
Página 2
Drawing No. Sheet No. Revision 5 K660 2906 2 /46 2003 / 6 / 12 REVISION CONTROL Remarks AD: Addition , CH: Change ,CR: Correction ,DL: Deletion Rev. Date Signature Page Description Remarks 0 2002 / 11 / 5 DWN : O,Suzuki CHKD: - APPD: - All First Issuance 1 2003/1/17 DWN : O,Suzuki CHKD: - APPD: - 3-5 11 27 Safety cautions were moved before table of[...]
-
Página 3
Drawing No. Sheet No. Revision 5 K660 2906 3 /46 2003 / 6 / 12 Read and follow all instructions and cautions described in this chapter before using the drive. It is recommended that this manual is kept at a proper location for quick reference. The description related to safety in this chapter may be changed without notice. Influence for environment[...]
-
Página 4
Drawing No. Sheet No. Revision 5 K660 2906 4 /46 2003 / 6 / 12 Followings are the cautions and contents described in this manual. Items of indicating : - Safety cautions for this product Page 4 Items of indicating : - Safety cautions for this product Page 4-5 - Spindle Start and Stop Page 16 - Mounting of the drive Page 24 - Reliability temperature[...]
-
Página 5
Drawing No. Sheet No. Revision 5 K660 2906 5 /46 2003 / 6 / 12 0 .2.11 Protect the drive against shocks with the corrugated board and cushioning material provided by the manufacturer, or with Hitachi Approved containers. 0 .2.12 When mounting the drive, use the size of screws and the torque recommended in this manual. If non-recommended size of scr[...]
-
Página 6
Drawing No. Sheet No. Revision 5 K660 2906 6 /46 2003 / 6 / 12 TABLE OF CONTENTS Chapter Page To use this product safely. ................................................................................. 3 1 Features ............................................................................................................... 8 2 Standards and Rel[...]
-
Página 7
Drawing No. Sheet No. Revision 5 K660 2906 7 /46 2003 / 6 / 12 11 Pi n assignment .................................................................................................... 33 11 .1 SCSI Bus Connector C1 ...................................................................... 33 11 .2 Other connectors .......................................[...]
-
Página 8
Drawing No. Sheet No. Revision 5 K660 2906 8 /46 2003 / 6 / 12 1 Features The Ultrastar 15K73 series uses high performance sputtered disks, GMR heads, and a rotary type voice coil motor to drive the heads. These features provide high capacity, high speed positioning and high reliability. The Ultrastar 15K73 series uses a SCSI interface for data tra[...]
-
Página 9
Drawing No. Sheet No. Revision 5 K660 2906 9 /46 2003 / 6 / 12 2 Standards and Related Documents (a) Safety standards It is the user’s responsibility to assure the actual system in which the drive is installed meets the appropriate safety requirements. However, the drive was tested to be in compliance with the following standards: UL 1950 3rd Edi[...]
-
Página 10
Drawing No. Sheet No. Revision 5 K660 2906 10 /46 2003 / 6 / 12 3 Description 3 .1 Characteristics Table 3 .1 Characteristics Item Specifications Ultrastar 15K73-73 Ultrastar 15K73-36 unit Configuration Storage capacity 73.9 36.9 GB (formatted) (see Note 1,2,13) Bytes/sector (see Note 3) 512, 516, 520, 524, 528,1024 Bytes Number of disks 5 3 Number[...]
-
Página 11
Drawing No. Sheet No. Revision 5 K660 2906 11 /46 2003 / 6 / 12 3 .2 Environmental conditions and reliability Table 3 .2 Environmental conditions and reliability Item Ultrastar 15K73-73 Ultrastar 15K73-36 Environmental operating 5 to 55 °C conditions Temperature non-operating - 40 to 70 °C storage/shipping - 40 to 70 °C Temperature gradient 20 ?[...]
-
Página 12
Drawing No. Sheet No. Revision 5 K660 2906 12 /46 2003 / 6 / 12 Note 1. Storage capacity does not include spare sector and spare cylinder. Note 2. This is the value in the case that the drive is formatted to 512 Bytes/sector. (1 gigabyte shows 1x10 9 bytes on this document.) Note 3. Ultrastar 15K73 is formatted to 512 Bytes/sector as the default. I[...]
-
Página 13
Drawing No. Sheet No. Revision 5 K660 2906 13 /46 2003 / 6 / 12 Note 7. The disk drive orientation for shock test is shown in Figure 4.2. Figure 3 .2 Shock test direction Test conditions on shock test are as follows. (1) Operating 147m/s 2 (15G) (Shock mode: half sine wave 11 ms, Test cycle: 5 times) (2) Non-operating 735m/s 2 (75G) (Shock mode: ha[...]
-
Página 14
Drawing No. Sheet No. Revision 5 K660 2906 14 /46 2003 / 6 / 12 Note 9. Recoverable error is measured at the nominal condition with voltage, temperature and default error recovery parameters. Note 10. The drive should be mounted properly (see section 8). Note 11. MTBF represents a prediction of performance based upon a large statistical sample calc[...]
-
Página 15
Drawing No. Sheet No. Revision 5 K660 2906 15 /46 2003 / 6 / 12 4 DC power Interface 4 .1 DC Power Requirement The drives are operated on DC power (+5V, +12V) only. No power sequencing is required. The +5 and +12 Volts can be applied in any order. Table 4 .1 DC Power Requirement Power supply Voltage tolerance Allowed ripple and noise +5V DC 5.0V +/[...]
-
Página 16
Drawing No. Sheet No. Revision 5 K660 2906 16 /46 2003 / 6 / 12 4.2 Power supply current Fig 4.1 Current transition for +12V Note: A retry Spin-up operation may be attempted during the Start up process. 4.3 Sp indle Start and Stop 4.3.1 Start and Stop Time Table 4 .2 Start and Stop time Item Typical unit Start 25 Note 1 s Stop 25 Note 2 s Note 1. S[...]
-
Página 17
Drawing No. Sheet No. Revision 5 K660 2906 17 /46 2003 / 6 / 12 4 .3.2 Spindle Start Selection When multiple disk drives are connected to the same power supply and turned on simultaneously, a large current will be required at power up. In the above case, it is recommended to turn the motors on one by one at intervals in order to minimize 12V line c[...]
-
Página 18
Drawing No. Sheet No. Revision 5 K660 2906 18 /46 2003 / 6 / 12 5 Connecting Methods 5 .1 Interface Cable (Daisy Chain) Figure 5 .1 Cabling layout ( WIDE LVD drive) Note 1. The SCSI bus can accommodate a maximum of 16 units on a WIDE (16-bit) bus, including the host processor, Ultrastar 15K73 units, and other SCSI devices. Note 2. The WIDE LVD and [...]
-
Página 19
Drawing No. Sheet No. Revision 5 K660 2906 19 /46 2003 / 6 / 12 5 .2 Low voltage differential (LVD) mode The N W and N C drives have two different transceivers to allow customer to use it in traditional systems which may use single-ended drivers and receivers, or to use it in low voltage differential (LVD) systems which use LVD drivers and receiver[...]
-
Página 20
Drawing No. Sheet No. Revision 5 K660 2906 20 /46 2003 / 6 / 12 6 SCSI Interface 6 .1 Summary of SCSI Controller The Ultrastar 15K73 SCSI controller interfaces between the drive and the host computer with the Small Computer System Interface (SCSI). (1) ANSI standard The controller supports the SCSI interface that conforms to the ANSI specifications[...]
-
Página 21
Drawing No. Sheet No. Revision 5 K660 2906 21 /46 2003 / 6 / 12 (8) Tagged Command Queuing A maximum of 110 commands can be enqueued to this drive. The drive does not have to connect and disconnect to the host controller even if the SCSI command has been issued successively, so the overhead time of the SCSI bus can be reduced. (9) S.M.A.R.T. (Self [...]
-
Página 22
Drawing No. Sheet No. Revision 5 K660 2906 22 /46 2003 / 6 / 12 6 .2 Summary of SCSI Commands The SCSI controller supports the group 0,1, and 2 commands listed in Table 6 .1 Table 6 .1 SCSI Commands Supported Operation Code Group 0 Command Name 00h 01h 03h 04h 07h 08h 0Ah 0Bh 12h 15h 16h 17h 1Ah 1Bh 1Ch 1Dh TEST UNIT READY REZERO UNIT REQUEST SENSE[...]
-
Página 23
Drawing No. Sheet No. Revision 5 K660 2906 23 /46 2003 / 6 / 12 Table 6 .1 SCSI Commands Supported (Continued) Operation Code Group 2 Command Name 41h 4Ch 4Dh 55h 56h 57h 5Ah 5Eh 5Fh WRITE SAME LOG SELECT LOG SENSE MODE SELECT (10) RESERVE (10) RELEASE (10) MODE SENSE (10) PERSISTENT RESERVE IN PERSISTENT RESERVE OUT Operation Code Group 5 Command [...]
-
Página 24
Drawing No. Sheet No. Revision 5 K660 2906 24 /46 2003 / 6 / 12 7 .2 Mounting of the drive 1. Mount the drive with four 6-32 UNC screws. (Screw's torque : 0.588 to 0.784 N·m) 2. Mounting holes (A1,A2,B1,B2,B3) are available for mounting.(See figure 8.3) It is recommended that the 4 holes, (A1,A2 or B1,B3 on figure 8.3), be used for mounting t[...]
-
Página 25
Drawing No. Sheet No. Revision 5 K660 2906 25 /46 2003 / 6 / 12 7 .3 Mounting dimensions Dimension mm A 101.6 ± 0. 25 B 95. 25 ± 0. 25 C 3.1 8 ± 0. 25 D 4 1.28 ± 0. 5 E 44.45 ± 0. 25 F 14 7 max. G 101.6 ± 0. 25 H 28.5 ± 0. 5 J 41.6 ± 0. 25 K 26.1 max. L 6.35 ± 0. 25 Figure 7 .3 Layout of Mounting holes F G H J K L B A D E C[...]
-
Página 26
Drawing No. Sheet No. Revision 5 K660 2906 26 /46 2003 / 6 / 12 7 .4 Precautions on the off-line test or bench test When the off-line test or bench test is performed the drive should be tightly fixed and cooled. The set-up should be similar to the actual system configuration. 7 .5 Cooling of the drive Keep the drive (HDA and PCB) cool by using a FA[...]
-
Página 27
Drawing No. Sheet No. Revision 5 K660 2906 27 /46 2003 / 6 / 12 8 Precautions for handling The drive is sensitive to shock, vibration, over voltage, temperature, humidity, corrosive gas, magnetic force and electrostatic discharge. If these forces contact the electrical or mechanical components (magnetic heads, magnetic disks), the drive will break [...]
-
Página 28
Drawing No. Sheet No. Revision 5 K660 2906 28 /46 2003 / 6 / 12 8 .4 Other Precautions 8 .4.1 Do not loosen the screws or disassemble the drive. 8.4.2 Do not remove the PCB from the drive or swap the PCB with other drives. 8.4.3 Do not solder the wire or other parts on the PCB, or reconstruct the PCB. 8.4.4 Do not remove the sealing tape or label o[...]
-
Página 29
Drawing No. Sheet No. Revision 5 K660 2906 29 /46 2003 / 6 / 12 10 Physical interface 10 .1 Connector Specifications Use the mating connectors which are electrically and mechanically compatible. The following part numbers indicate the mating connectors. Table 1 0 .1 Interface connectors Interface Name Part number Manufacturer WIDE LVD SCSI interfac[...]
-
Página 30
Drawing No. Sheet No. Revision 5 K660 2906 30 /46 2003 / 6 / 12 (2) DC Power Supply Cable The DC power cable should be as short as possible to minimize voltage drop. Table 1 0 .2 Interface cable ( WIDE , Single-ended mode) Cable Type Maximum cable length Fast-5 Fast-10 Ultra (Fast 20) SCSI interface Flat Ribbon or Twisted Pair 6m (16 units max.) 3m[...]
-
Página 31
Drawing No. Sheet No. Revision 5 K660 2906 31 /46 2003 / 6 / 12 10 .3 Connector Layout WIDE LVD drive C1 SCSI Bus Connector C4 Auxiliary Connector C2 Power Connector Figure 1 0 .1 Connector Layout ( WIDE LVD drive) C1 4 3 2 1 68 1 34 2 12 1 11 C2-1 : 12V C2-2 : GND (12V Return) C2-3 : GND (5V Return) C2-4 : 5V 35 C4 C2 Figure 1 0 .2 Connector view [...]
-
Página 32
Drawing No. Sheet No. Revision 5 K660 2906 32 /46 2003 / 6 / 12 SCA-2 LVD drive N P D H M W L Dimension mm Dimension mm H 26.1 max. W 101.6 ± 0. 25 D 6.35 ± 0. 25 L (58) N (7) M 50.8 ± 0.5 P 4.6 ± 0.5 Figure 1 0 .3 Connector Layout ( SCA-2 LVD drive) 1 40 41 80 C1 PCB parts side Figure 1 0 .4 Connector view[...]
-
Página 33
Drawing No. Sheet No. Revision 5 K660 2906 33 /46 2003 / 6 / 12 11 Pin assignment 11 .1 SCSI Bus Connector C1 Table 1 1 .1 Pin assignment of SCSI Bus Connector C1 ( WIDE , Single-ended mode) Signal Name Connector contact No. Cable conductor No. Connector contact No. Signal Name GND 1 1 2 35 -DB(12) GND 2 3 4 36 -DB(13) GND 3 5 6 37 -DB(14) GND 4 7 [...]
-
Página 34
Drawing No. Sheet No. Revision 5 K660 2906 34 /46 2003 / 6 / 12 Table 11.2 Pin assignment of SCSI Bus Connector C1 ( WIDE , LVD mode) Signal Name Connector contact No. Cable conductor No. Connector contact No. Signal Name +DB(12) 1 1 2 35 -DB(12) +DB(13) 2 3 4 36 -DB(13) +DB(14) 3 5 6 37 -DB(14) +DB(15) 4 7 8 38 -DB(15) +DB(P1) 5 9 10 39 -DB(P1) +D[...]
-
Página 35
Drawing No. Sheet No. Revision 5 K660 2906 35 /46 2003 / 6 / 12 Table 1 1 .3 Pin assignment of SCSI Bus Connector C1 ( SCA-2 , Single-ended mode) Signal Name Connector contact No. Signal Name 12V 1 41 GND(12V Return) 12V 2 42 GND(12V Return) 12V 3 43 GND(12V Return) 12V 4 44 MATED1 (Note 2) Open 5 45 Open Open 6 46 DIFFSENS -DB(11) 7 47 GND -DB(10)[...]
-
Página 36
Drawing No. Sheet No. Revision 5 K660 2906 36 /46 2003 / 6 / 12 Table 1 1 .4 Pin assignment of SCSI Bus Connector C1 ( SCA-2 , LVD mode) Signal Name Connector contact No. Signal Name 12V 1 41 GND(12V Return) 12V 2 42 GND(12V Return) 12V 3 43 GND(12V Return) 12V 4 44 MATED1 (Note 2) Open 5 45 Open Open 6 46 DIFFSENS -DB(11) 7 47 +DB(11) -DB(10) 8 48[...]
-
Página 37
Drawing No. Sheet No. Revision 5 K660 2906 37 /46 2003 / 6 / 12 11.2 Other connectors Table 1 1 .5 Pin assignment of Auxiliary Connector C4 ( WIDE LVD drive) Pin No. Signal Name Pin No. Signal Name Note 1 -ID0 2 Reserved 3 -ID1 4 Reserved 5 -ID2 6 Reserved 7 -ID3 8 LED(with 150 ohm) See Figure 12.1 9 N.C. 10 GND 11 5V 12 -WRITE PROTECT Table 1 1 .6[...]
-
Página 38
Drawing No. Sheet No. Revision 5 K660 2906 38 /46 2003 / 6 / 12 Table 1 1 .7 Pin assignment of Option Jumper Connector C3 ( SCA-2 LVD drive) Pin No. Signal Name Pin No. Signal Name Note 1 -ID3 2 GND 3 -ID2 4 GND 5 -ID1 6 GND 7 -ID0 8 GND 9 -Disable Auto Start 10 GND 11 -Force Single-Ended mode 12 GND 13 -Enable Delayed Start 14 GND 15 -Write Protec[...]
-
Página 39
Drawing No. Sheet No. Revision 5 K660 2906 39 /46 2003 / 6 / 12 12 Jumper Socket setting 12.1 Jumper connector layout WIDE LVD drive Reserved (4) Reserved (6) Auxiliary Connector (C4) 2 1 ID0 (1) ID1 (3) ID2 (5) ID3 (7) GND (10) N.C. (9) 5V (11) Write Protect (12) LED (8) Reserved (2) 12 11 Option Jumper Connector (C3) 1 2 23 24 Force Single-Ended [...]
-
Página 40
Drawing No. Sheet No. Revision 5 K660 2906 40 /46 2003 / 6 / 12 SAC-2 LVD drive Option Jumper Connector (C3) 1 2 23 24 Force Single-Ended bus mode (11) Disable Auto Start (9) ID2 (3) ID1 (5) ID0 (7) ID3 (1) Enable Delayed Start (13) Write Protect (15) LED (with 0ohm) (21) Reserved (19) Reserved (23,24) Reserved (17) 5V(with 150ohm) (22) GND (2,4,6,[...]
-
Página 41
Drawing No. Sheet No. Revision 5 K660 2906 41 /46 2003 / 6 / 12 12 .2 Jumper socket setting The Jumper sockets should be set only when the power is off. 12 .2.1 SCSI ID WIDE LVD No. Option Jumper Connector (C3) SCSI ID # Remove all Jumper Sockets (Default) 0 1 2 3 4 5 6 7 0 Install the Jumper Socket for C3-1,2 8 Install the Jumper Sockets for C3-1,[...]
-
Página 42
Drawing No. Sheet No. Revision 5 K660 2906 42 /46 2003 / 6 / 12 12 .2.2 SCSI ID SCA-2 LVD No. Option Jumper Connector (C3) SCSI ID # Remove all Jumper Sockets (Default) 0 1 2 3 4 5 6 7 0 Install the Jumper Socket for C3-1,2 8 Install the Jumper Sockets for C3-1,2 & 3,4 & 5,6 14 Install the Jumper Sockets for C3-3,4 & 5,6 6 Install the J[...]
-
Página 43
Drawing No. Sheet No. Revision 5 K660 2906 43 /46 2003 / 6 / 12 12 .2.3 Disable Auto Start WIDE LVD No. Option Jumper Connector (C3) Meaning Remove the Jumper Socket for C3-9,10 (Default) 1 Install the Jumper Socket for C3-9,10 2 Spindle motor starts only by SCSI command Spindle motor automatically starts when the power is applied or in sequence vi[...]
-
Página 44
Drawing No. Sheet No. Revision 5 K660 2906 44 /46 2003 / 6 / 12 12 .2.4 Force Single-Ended bus mode WIDE LVD , SCA-2 LVD No. Option Jumper Connector (C3) Meaning Remove the Jumper Socket for C3-11,12 (Default) 1 Install the Jumper Socket for C3-11,12 2 The drive can be used as single-ended or low voltage differential mode. The drive is forced to op[...]
-
Página 45
Drawing No. Sheet No. Revision 5 K660 2906 45 /46 2003 / 6 / 12 12 .2.6 SCSI bus Terminator Power WIDE LVD No. Option Jumper Connector (C3) Meaning Remove the Jumper Socket for C3-23,24 (Default) 1 Install the Jumper Socket for C3-23,24 2 2 1 2 23 24 24 1 23 Terminator power supplied to SCSI TERMPWR line (To SCSI bus cable) Terminator power not sup[...]
-
Página 46
Drawing No. Sheet No. Revision 5 K660 2906 46 /46 2003 / 6 / 12 12 .3 Jumper socket part number Part numbers of jumper sockets are as follows: Table 1 2 .1 Jumper socket Part number Manufacturer Name MINITEK JUMPER FCI Japan K.K. 86730-001 Connector Option Jumper Connector (C3) 12 .4 Extension connector Part numbers of extension connectors for remo[...]