Multitech RF500S Spécifications télécharger pdf (Page 34)

30

Rather then terminating building cables at a patch panel they were directly terminated with CAT5 plugs.

Terminating plugs is somewhat harder then receptacles but it eliminated the need and cost of a patch panel

and patch cables. Building wire is plugged directly into the central hub.

PCs run Microsoft Windows 98SE or Millennium operating system. The only communication protocol

used is TCP/IP. Using the same protocol for local access and Internet simplifies configuration. Most

machines are assigned a dynamic IP address. This minimizes problems adding and removing computers

from the network. Servers need static address so the can be referenced by IP address. The router has a

provision to bind the IP address to Ethernet MAC address. This is convenient because the router always

assigns the same address even though the device is configured for dynamic addressing.

One PC is dedicated for use as a server. It runs file sharing, web server, and a timeserver. It has Browse

Master enabled so it is always the Network Neighborhood Browse Master. This insures Network

Neighborhood is always visible. A dedicated print server is used for network printing.

8 Broadband Router – One Address So Many Computers

This section describes how to connect a LAN to a single Internet

account.

When the LAN was first set up we used Wingate proxy software

running on a laptop. This allowed multiple computers to share a

single dialup ISP account. At the time Wingate was the only

connection sharing software that included a DHCP server. This was

a convenient cost effective solution. However over time

shortcomings of this approach became apparent.

Software Proxy Limitations:

Each application must be configured to use the proxy. This

makes moving a laptop between LANs difficult. We wanted to replace the Proxy with NAT.

Wingate had a NAT version of the software but we had trouble getting an early version to work

with our hardware.

Streaming services such as Windows Media Player and Real Audio player do not work well

behind a proxy.

Even though connection sharing software does a good job protecting PCs on the LAN the machine

connected to the Internet is still vulnerable. If that machine is compromised the attacker has access

to everything on the LAN. To protect the directly connected PC I ran a software firewall. This

tended to be fragile. Often installing the latest Microsoft patch broke the firewall.

When one factors in the total cost for the software solution, second NIC card, sharing software and

firewall very little difference exists between software and hardware solutions.

Our router requirements:

Ethernet port for DSL

RS232 Serial port for dialup modem

Automatic fallback to analog modem if broadband fails

NAT using single public IP address

4 port 10/100 Ethernet Switch

DHCP server for LAN addresses

Dynamic and static IP address assignment on LAN

IPsec pass through for VPN

Port mapping to run servers

Good tech support

Figure 24 Broadband Router

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 56 57

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Carrier 59SC2A Manuel d'instructions (84 pages)

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Table des matières

Condensing Gas Furnace

1

Series 100

1

IMPORTANT

2

SAFETY CONSIDERATIONS

3

INTRODUCTION

4

CODES AND STANDARDS

4

ELECTROSTATIC DISCHARGE (ESD)

4

PRECAUTIONS PROCEDURE

4

ACCESSORIES

5

Fig. 1 -- Dimensional Drawing

6

80 / 27˚C

7

LOCATION

8

AIR FOR COMBUSTION AND

9

VENTILATION

9

Standard Method

10

NP = Not Permitted

11

Outdoors

12

CONDENSATE TRAP

13

Downflow Trap Configuration

14

(Appearance may vary)

15

CONDENSATE DRAIN CONNECTION

17

L12F019B

18

Formed end of

19

INSTALLATION

20

Horizontal Installation

21

Filter and Return Duct Sizing

22

(FIELD SUPPLIED)

24

UPFLOW DOWNFLOW HORIZONTAL

26

HORIZONTAL TOP

27

RETURN NOT

27

PERMITTED FOR

27

ANY MODEL

27

COMBUSTION - AIR PIPE

28

(SEE VENTING SECTION)

28

AIR DUCTS

29

GAS PIPING

31

ELECTRICAL CONNECTIONS

32

J--Box Installation

33

24--V Wiring

33

Alternate Power Supplies

33

Materials

38

Venting Systems

38

Locating the Vent Termination

39

Direct Vent / 2-Pipe System

40

Ventilated Combustion Air

40

Guidelines

41

Configure the Furnace

42

Roof Terminations

43

Example 1

48

Example 2

48

Vent Coupling and Adapter

50

Downflow Vertical

52

HORIZONTAL LEFT

53

RIGHT VENT CONFIGURATION*

53

VENT PIPE FLUSH WITH ADAPTER

55

Roof Termination (Preferred)

58

COMBUSTION-AIR

59

(ELBOW PARALLEL TO WALL)

59

Polypropylene Venting Systems

61

Purge Gas Lines

62

Adjustments

62

Adjust Temperature Rise

64

Adjust Cooling Airflow

64

338309-201 Rev. E

66

SINGLE-STAGE FURNACE

68

SERVICE AND MAINTENANCE

70

PROCEDURES

70

Component Self-Test

71

Checklist

71

Care and Maintenance

71

Servicing Hot Surface Igniter

74

Cleaning Heat Exchangers

75

Burner Flame

76

Manifold

76

Fig. 62 -- Blower Assembly

77

Fig. 63 -- Burner Assembly

78

SEQUENCE OF OPERATION

79

Troubleshooting Guide

80

Troubleshooting Guide (Cont)

81

Fig. 65 -- Wiring Diagram

82

Replaces: 59SC2A---01SI

84

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