System Unit Rear Panel Connectors. HP (Hewlett-Packard) N/A

product information

System Unit Rear Panel Connectors

System Unit Rear Panel Connectors

This section describes the following connectors on the system unit’s rear panel:

• Two serial ports (RS-232)

• Two Universal Serial Bus ports (USB)

• LAN connector, 10 BaseT/100 BaseT

• HP parallel IEEE 1284 (printer) connector

• Audio connectors (PCI based, line in, line out, headset, and microphone in)

• Ultra2 Wide LVD (Low Voltage Differential) SCSI

• Ultra Narrow Single-Ended (NSE) SCSI

• TOC (transfer of control) button

• AC power cord connector

• Security loop

NOTE To maintain FCC/EMI compliance, verify that all cables are fully seated and properly fastened.

Figure 1-5. System Unit Rear Panel Connectors

Security Loop

Serial Ports (2)

USB Ports (2)

TOC Button

LAN Port

Parallel Port

Audio Connectors:

Line In

Line Out

Microphone

Headphones

Ultra2 Wide LVD SCSI

Chapter 1

AC Power Cord

Connector

Ultra Narrow Single-Ended (NSE) SCSI

25

product information

System Unit Rear Panel Connectors

audio connectors

The HP workstation c-class has audio-input and -output capabilities through external input and output connectors on the rear panel and through an internal speaker. The sound is 16-bit, 44 kHz (CD-quality).

The rear panel contains the Audio IN (Stereo line-in) and Microphone (Mic-in), and Audio

OUT (Stereo line-out) and Headphones (headphone-out) connectors. This workstation also has a mono internal speaker.

The audio connectors are standard stereo audio mini-jacks (see Figure 1-6).

NOTE Hewlett-Packard recommends using gold-plated plugs available through audio retailers for best quality recording and playback through the external connectors.

Figure 1-6. Audio Connectors

Audio IN

Audio OUT

Microphone IN

Headset

Table 1-3. summarizes the audio electrical specifications for the c-class workstations.

26 Chapter 1

product information

System Unit Rear Panel Connectors

Table 1-3. Audio Electrical Specifications

25 to 20KHz Frequency Response

Input Sensitivity/Impedance

Line in

Microphone in

Max Output Level/Impedance

Line Out

Headphone

Speaker (internal)

Output Impedance

Line Out

Headphone

2.0V pk/47kohm

22mVpk/1kohm

2.8Vpp/47kohm

2.75Vpp/50ohm

5.88Vpp/48ohm

619ohm

118ohm

USB connectors

The USB connectors located on the rear panel of the workstation provide an interface for the keyboard and mouse to the system. These USB connectors support only the HP keyboard, scroll mouse and hub. The keyboard and mouse may be plugged into the rear of the workstation or plugged into the USB hub. No other USB configuration is currently supported. Consult the documentation that accompanies each input device for specific information concerning its use.

For more information on the Universal Serial Bus, refer to the following URL: http://www.usb.org

CAUTION Usage of devices other than USB specification may result in unpredictable functionality and inferior performance of the HP workstation c-class.

NOTE The USB clip on the rear of the chassis provides strain relief for the USB cables.

hp parallel i/o connector

The 25-pin HP Parallel I/O interface uses IEEE 1284 I/O interface protocols to support peripheral devices such as printers and plotters. Consult the documentation that accompanies each peripheral device for specific information concerning its use.

802.3 network connectors

The HP workstation c-class has a built-in Twisted Pair (TP) connector for the 802.3

(ETHERNET) or 10BaseT/100BaseT network. Connections to ThinLAN networks require

Chapter 1 27

product information

System Unit Rear Panel Connectors an external transceiver. The workstation automatically selects the correct network setting.

Pin No.

7

8

5

6

9

3

4

1

2

RS-232 serial input/output connectors

There are a variety of peripheral devices that can attach to the RS-232 Serial

Input/Output (SIO) ports on this workstation. Refer to the label on the rear of the workstation to locate serial port 1 and serial port 2. Peripheral devices include printers, plotters, modems, and scanners. Consult the documentation that accompanies each peripheral device for specific information concerning its use.

The SIO ports are programmable, allowing functions such as bit rate, character length, parity, and stop bits to be set using the System Administration Manager (SAM) or by selecting a system special device file with the functions already programmed. The SIO

Ports are used as interfaces for serial asynchronous devices to the CPU.

Table 1-4. shows the SIO connector pin listings. The serial connectors are 9-pin D-sub

connectors. Signal names are those specified in the EIA RS-232 standard.

Table 1-4. Serial I/O Pins

Signal

DCD

RXD

TXD

DTR

GND

DSR

RTS

CTS

RI

Description

Data Carrier Detect

Receive Data

Transmit Data

Data Terminal Ready

Ground

Data Set Ready

Request To Send

Clear To Send

Ring Indicator

SCSI connectors

The c-class workstation has built in SCSI connectors for Ultra2 Wide Low-Voltage

Differential (LVD) SCSI and Ultra Narrow Single-Ended (NSE) SCSI. Use the SCSI connectors to connect external SCSI devices such as DDS-format tape drives and CD-ROM drives. Consult the documentation that accompanies each SCSI device for specific information concerning its use. Refer to Appendix B, SCSI Connections, for information about connecting SCSI devices to your workstation.

NOTE There must ALWAYS be a terminator at both ends of a SCSI bus. This means one internal terminator and one external terminator.

28 Chapter 1

product information

System Unit Rear Panel Connectors

TOC button

The TOC (transfer of control) button interrupts the system and transfers control from the default device to an auxiliary device. A transfer of control saves the state of the processor in Processor Internal Memory (PIM) and begins execution of recovery software at a nonzero location specified by a special location in Page Zero called MEM_TOC. The TOC code is protected by a checksum.

power cord connector

Plug the workstation’s power cord into the power cord connector to provide AC power to the system.

security loop

The security loop provides a means of locking the left side panel with a padlock or other locking device to prevent unauthorized access. To operate the security loop:

1. Inspect left side panel for proper seating in the mainframe chassis.

2. Push in the retractable pin on the spring loaded square fastener.

3. Insert the locking device through the top and bottom holes of the square fastener.

4. Inspect after locking device is in place to assure that the retractable pin is captured in the side panel insert hole.

The internal components of the workstation is now secured. See Figure 1-7. on page 30.

NOTE A locking device is not supplied with the workstation; the customer must supply a lock to use with the security loop.

Chapter 1 29

product information

System Unit Rear Panel Connectors

Figure 1-7. Security Loop Operation

Security Loop Pin Pushed

In Place By The Padlock

Security Loop Pin and Spring

Security Loop Pin

Hole

30 Chapter 1