FAQ

Questions and Answers:

1. How does it fit so many modems?

The bar is adjustable for most modems. Larger modems that won't fit the standard X-16 can fit the deeper Courier-style rack.

Movable support bar

2. How do I make my PC into a PPP/SLIP server?

Use a multi-port card and server software. There are lots of models available. Use Linux , Windows Server, for dial-in or dial-out lines, for up to 1024 modem connections. For windows, use RAS.

3. I want to put a large bank of modems in a another calling area and tie them into my one incoming phone line to cut costs. What's an easy way?

Use ISDN, a cable modem, or any other connection to the internet at that location.

Set Multi-Home Routing On (packet forwarding) in the control panel for TCP/IP.

4. My system sometimes rings, but doesn't answer. All of the dial in users get sent to the modem that isn't answering. How can I stop this?

The ring/no-trip problem caused by a stuck or dead modem is made worse by your using a 'rotary'. Anytime someone calls your number, the central office routes it to the next unavailable line. That's invariably the dead one, as no one can get it to answer. Call the phone company and have them switch you to "least used" routing.

5. Some of my modems seem to goof up, but only on weekends when I'm not there. What's wrong?

Try turning on the air conditioner! You can also easily add a fan module at the bottom of the rack.

You do not usually need a fan module. A lot of our customers use the modem module 'as is'. If you are running a 8-modem system with a gap between every other modem, or the rack is in a computer-class environmentally controlled area, then you are probably safe in not using one.

However, there are many times when you should consider a FM-3 fan module. If you are using a low-grade modem, for example. If you need more reliability in your application. Or if you pack 16 modems (and transformers) into a rack along with other hot equipment and let them all cook.

The modems use a lot of power. But you need to remember that transformer can also generate half of the total heat, and if this is directed or gets into the electronics, then the temperature rise can be quite high.

So you should consider ways to avoid temperature changes, avoid temperature extremes, and lower system temperatures as low as practical. A fan module is a simple and low cost addition that accomplishes most of these goals in a single 1.75" rack space.

The modems everyone uses in the X-16 are designed as a desktop grade, 'shirtsleeve' environment modem. Think 'people compatible'. When the skins are removed, and they are mounted vertically, then they self cool through convection cooling, as the heat rises. But, if the A/C is turned off on weekends, then things can go downhill pretty quickly. We offer a $40 off savings on a rack/fan combo because on a few occasions people call us up on Monday to order just the fan after their system failed to make it over the weekend. We've rather make less money and save them the trouble.

6. What about 56K support?

No analog modem can work over 33.6 K when it answers a phone. Even a 56K to digital connection is only 33.6 K in one direction, and less than 56K in the other.

To get 56K dialup, you must have a digital modem pool at the receiving end. Two 56K dialup modems will connect to each other at a max rate of 33.6K.

Last Update 01/24/06