AOpen OpenBook 1556, Service Manual

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20 OpenBook 1556
LAN Interface
Item Specification
Chipset BCM 4401/5705M
Supports LAN protocol 10/100 Mbps or Giga LAN
LAN connector type RJ45
LAN connector location Rear side
Modem Interface
Item Specification
Chipset Ambit MDC module with Lucent modem controller
Fax modem data baud rate (bps) 14.4K
Data modem data baud rate (bps) 56K
Supports modem protocol V.90 MDC
Modem connector type RJ11
Modem connector location Rear side
Hard Disk Drive Interface
Item Specification
Vendor & Model Name Hitachi
DK23EA-20 Hitachi
DK23EA-30 Hitachi
DK23EA-40
Capacity (MB) 20G 30G 40G
Bytes per sector 512 512 512
Data heads 2 2 3
Recording zone 16 16 16
Drive Format
Disks 1 1 2
Spindle speed (RPM) 4200 RPM 4200 RPM 4200 RPM
Performance Specifications
Buffer size 2048KB 2048KB 2048KB
Interface ATA-5 (IDE) ATA-5 (IDE) ATA-5 (IDE)
Max. media transfer rate (disk-buffer,
Mbytes/s) 19.4 ~ 37.1 19.4 ~ 37.1 19.4 ~ 37.1
Data transfer rate (host~buffer,
Mbytes/s) 16.6 MB/Sec.
(PIO Mode 4/Multiword
DMA Mode 2)
100 MB/Sec.
(Ultra DMA Mode 5) 16.6 MB/Sec.
(PIO Mode 4/Multiword
DMA Mode 2)
100 MB/Sec.
(Ultra DMA Mode 5) 16.6 MB/Sec.
(PIO Mode 4/Multiword
DMA Mode 2)
100 MB/Sec.
(Ultra DMA Mode 5)
DC Power Requirements
Voltage tolerance 5V(DC) +/- 5% 5V(DC) +/- 5% 5V(DC) +/- 5%