Note: The service processor, management module, or systems-management function must monitor the alarm reset inputs to maintain the fault condition that you set for the unit. The alarm reset inputs can be voltages in excess of standard logic levels, so you must electrically or optically isolate them from the monitoring logic.

Table 4. Alarms connector pinout

Pin #

Description

I/O

Pin #

Description

I/O

 

 

 

 

 

 

1

Minor alarm reset +

I

9

Minor alarm normally

O

 

 

 

 

closed

 

 

 

 

 

 

 

2

Minor alarm reset -

I

10

Minor alarm common

O

 

 

 

 

 

 

3

Major alarm reset +

I

11

Major alarm normally open

O

 

 

 

 

 

 

4

Major alarm reset -

I

12

Major alarm normally

O

 

 

 

 

closed

 

 

 

 

 

 

 

5

Critical alarm normally

O

13

Major alarm common

O

 

open

 

 

 

 

 

 

 

 

 

 

6

Critical alarm normally

O

14

Reserved

O

 

closed

 

 

 

 

 

 

 

 

 

 

7

Critical alarm common

O

15

Reserved

O

 

 

 

 

 

 

8

Minor alarm normally open

O

 

 

 

 

 

 

 

 

 

The electrical specifications for the alarms connector are as follows:

–Outputs

-Voltage range: 0 V dc to -100 V dc (maximum current 0.3 A at 100 V dc)

-Current range: 0 A to 1 A (maximum voltage 30 V dc at 1 A)

-Worst-case VA: 1 A at -30 V dc (30 VA maximum) indefinitely

–Inputs

-Voltage range: 0 V dc to -100 V dc (including transients)

-Differential input voltage: 3 V dc to 72 V dc

–Reset input activation

Pulse width: 200 ms (minimum) to 300 ms

I/O modules

You can install a maximum of four I/O modules at the rear of the system (a maximum of four Gbit Ethernet switches, or a maximum of two Gbit Ethernet switches and two Fibre Channel switches). The minimum system configuration requires one Gbit Ethernet switch or pass-thru module. The I/O switch modules provide high-performance connectivity between the blade servers.

See the documentation that comes with each I/O module for a description of the LEDs and connectors on the I/O module.

BladeCenter T unit power, controls, and indicators

This section describes the controls and light-emitting diodes (LEDs) and how to start and shut down the BladeCenter T unit.

Starting the BladeCenter T unit

Complete the following steps to start the BladeCenter T unit:

1. Read the information in “System reliability considerations” on page 39.

Chapter 1. General information 19

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IBM Type 8720, Type 8730 manual BladeCenter T unit power, controls, and indicators, Starting the BladeCenter T unit, Modules
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Type 8730, Type 8720 specifications

The IBM Type 8720 and Type 8730, part of IBM's extensive line of printers, stand out as reliable and technologically advanced devices designed for both small and large-scale industries. These printers, which were introduced in the early 1990s, catered to the evolving needs of businesses by delivering high-quality output combined with versatility and efficiency.

One of the main features of the IBM Type 8720 is its innovative line printer technology. Unlike traditional printers that utilized a single print head, the 8720 employs a unique printing mechanism that utilizes multiple print wires, ensuring faster print speeds and more precise character formations. This multi-wire technology enables the printer to achieve a print speed of up to 1,500 lines per minute, making it ideal for high-volume printing environments.

The IBM Type 8730, on the other hand, builds upon the foundation set by the 8720 by introducing more advanced features aimed at enhancing user experience. Among its key characteristics is its advanced processing capability, which allows for more complex document handling and high-quality graphics outputs. The 8730's capability to support a range of media types, including labels, envelopes, and fanfold paper, further enhances its versatility, enabling businesses to print various documents without needing multiple machines.

Both printers are designed with user-friendly interfaces that simplify operations and maintenance. Their modular design allows for easy upgrades, ensuring that companies can keep pace with changing printing demands and technological advancements. Additionally, their robust build quality guarantees long-lasting performance even in demanding environments.

In terms of connectivity, the IBM Type 8720 and 8730 support a variety of communication protocols, including parallel and serial interfaces, which facilitate easy integration into existing network environments. This connectivity ensures that businesses can seamlessly connect the printers to their mainframes or personal computers, streamlining the printing process.

Overall, the IBM Type 8720 and Type 8730 are exemplary allies for businesses seeking efficient, high-speed printing solutions. With their advanced technologies, extensive features, and reliable performance, these printers have maintained a loyal following and continue to be relevant in the realms of business printing, showcasing IBM's commitment to innovation and quality in the field of printing technology.
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