Question about Datacom CMS 6424 (cms6424cs-dual) Modem

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DSU 6424 connection

I have 2 DSU 6426 connected thru a dedicated phone line. had a storm and now my computers are not working across this connection. i'm not that familiar with setting up DSU and Omni Mux it connects to. can anyone tell me what to look for on the DSU on each location that would tell me the DSU are connected. the DSU's have display windows on them or maybe how can i test them.

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Re: DSU 6424 connection

Unfortunately if the problem started after a lightning storm the modem is almost certainly fried. I used to work at the UK's largest IT support call centre, we used to check the weather reports every morning because if there had been a lightning storm anywhere in the country we'd get a slew of calls from that region from people who could no longer connect to the web. Phone-lines collect a large static charge during a storm and are unprotected. I'd strongly suggest you contact the supplier regarding replacement.

Posted on Sep 03, 2007

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Can a VeriFone vx510 be wired into a dedicated phone line,process say a sale than let the line become active again so you can use said phone?

the terminal requires a dedicated analog phone line. it will allow you to use the phone while you are not using the terminal. if you are in the process of running a transaction and the phone rings or someone picks up the line you can get communication errors and will have to try to reconnect the communication so the sale can be processed.
it does work though but it causes some issues at times

Feb 14, 2015 | VeriFone M25100033NAB Vx 510 Countertop...


Troubleshooting for modem.

User's modem does not dial or does not connect.
Prove that computer is connected with phone line and check that phone line contains dial tone.Therefor check that connection is connect or not.
  • Connection may not be less than six feet (1.8 meter).
  • Check dial tone by plug in the phone in phone jack.
  • If user has many more services (such as call waiting,call messaging OR voice mail) then check that these all are cleared or not and check call waiting is disabled while using modem.
  • Disconnect any answering machine,fax machine or printer which are on line with modem.
  • Check that are you not using digital,rollover or PBX line?These type of lines not works with modem.
  • Try with another phone line. (For this, you have another phone number or another phone line).If user connected with another line then you need to complain in phone company.
  • Try to connect modem with low connection speed.

on Apr 13, 2010 | Modems

1 Answer

I have a problem with a Mitel sx2000 PBX which seams to be causing our line supplier problems. They say it is showing slips on the line and we need to have the clock set to theres and not the internal...

Your DSU/CUS can set clocking/timing from the local central office (CO) or internal.
There are MANY external DSU/CSU in the market.
Example: Adtran and Lucent

Please reply with what type of T1 DSU/CSU is connected to your unit.
==== If your setup does not use an external DSU/CSU then look for setting for your internal T1 card.

Are all cards on the same rack?

Jan 05, 2011 | Mitel SX200 480 Port T1 Adaptor...

1 Answer

Can't set up dial-up connection

Restart the computer.
Enter BIOS setup.
Click to "disable" both the COM1 and COM2 (or Serial1 and Serial 2) ports.
Save-and-exit from BIOS setup.
Restart Windows.
The modem should now be assigned as 'COM1', and should work.

Apr 17, 2010 | Arris SM56 (SM-56-PCI) Modem

1 Answer

My computer and phone are connected to the extension of the main plug in another room ,I have a filter on the line , my broad band will only work when I use the phone, when phone is back on reciever bb...

Be sure the filter is only on the line going to the phone. The computer won't work through the filter.

Best of luck, I hope this helped!

Mar 06, 2010 | Modems

1 Answer

Cannot receive phone calls on a dsl setup

There must be DSL Spliter inbetween telephone line & Wi-fi modem. Please check whether you have connected telephone instrument line with that Spliter or not. According to me, Telephone instrument should connect to telephone line option on DSL Splitter to use same telephone line as internet as well Telephone.

Mar 03, 2010 | Modems

1 Answer

I have Linksys modem no AM300.I try and send a fax and it will not go through Error report "NO Answer" BUT I know fax machine on other end is ok.Internet is ok.Can you help John

Even though you have internet, have you connected a phone line? Most fax machines/software rely on the phone line. I don't know how you are sending a fax. If you are sending a fax directly from an all-in-one, you'll need to connect the phone line to the back of that device. If you're sending a fax using a program on the computer, you'll need to connect the phone to the back of the computer.

You can temporarily disconnect your land-line phone and connect it to the all-in-one or computer. Just remember to reconnect it when you are done so you can receive phone calls.

I hope this helps!

Sep 07, 2009 | Linksys Modems

1 Answer


I would contact my ISP, the problem could be in the line somewhere. If there was a storm that went through lightning could of hit a phone line, or circuit, between you and the co.

Aug 10, 2009 | Multitech Systems Multi-Tech MultiMobile...

1 Answer

No Dial Tone...

first check your phone lines, if they're good call the phone company, you should have a dial tone. netzero only offers dialup so the internet you are using is your neihbors....they didn't lock their router. good luck

Aug 11, 2008 | Modems

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