I have everything V.92 enabled. However, I've found that with some modems (Lucent/Agere specifically), if you enable PCMupstream on the client modem (which isn't enabled by default), that you get WAY slow downstream speed. One particular case was getting 49333 down/26400 up. Enabled PCMupstream and got 28800 down/33333 up. Waste of time, at least with those modems. -----Original Message----- From: Seth Jacobs [mailto:sjacobs@onramp113.com] Sent: Tuesday, January 28, 2003 4:37 PM To: usr-tc@mailman.xmission.com Subject: [USR-TC] Which v.92 Features are best? We're about to enable v.92 support in our TC1000. We're mostly interested in the MOH and the Quick Connect features. I've heard that if the PCM feature is enabled, it tends to negate the effectiveness of the Quick Connect feature, so we're thinking about not activating that feature. Anyone with field experience care to comment? Seth ----- Original Message ----- From: <BSmith@solunet.com> To: <usr-tc@mailman.xmission.com> Sent: Tuesday, January 28, 2003 1:15 PM Subject: RE: [USR-TC] Switching from First Available to Round Robin
-----Original Message----- From: Seth Jacobs [mailto:sjacobs@onramp113.com] Sent: Tuesday, January 28, 2003 3:52 PM To: usr-tc@mailman.xmission.com Subject: Re: [USR-TC] Switching from First Available to Round Robin
We would do RR if we could (phone company says it's not possible).
The only downside I see is that if a modem does go stupid it might take longer to notice.
Seth
----- Original Message -----
Seth,
You can do Round Robin on the Total Control, your Telco does NOT need to configure anything. RR on the TC Hub just cycles through your MODEMS, it doesn't do anything with the actual channels.
Typically the HiperDSP is configured so that Ch 1 = Modem 1, all the way through. So, what you can do is the following:
First Available.
Lets say 10 people are connected, and modems 1-10 are in use. Then 2 people disconnect (modem 2 & 4), with First Available the next call that comes in will get modem #2 ... and the one after that gets modem #4.
Now, with Round Robin.
If 10 people are on, 10 modems in use. Channel 2 & 3 become available (user disconnect), next person that dials gets modem 11, and then modem 12 .. Once it cycles to modem 24 (or 23), it goes back to modem 1.
And of course, you have your one to one mapping.
10 people connect, modem 2,6,8 disconnect. If Channel 8 gets a call, it uses modem 8, and so on.
Therefore, none of these are configured by your Telco. It is all setup on the total control.
The Round Robin you are thinking of is controlled by the Telco, where it cycles through ALL available channels, 1-23 -> next span 1-23, etc ...
So, then what would be the practicality of it? Well, with some vendors, the modems take a few seconds to reset. Now, if you have a heavy load on your box, that is a problem. Why? Well, if you have 23 lines, and 30 people trying to connect, 7 people will get busy. If that the redialer going, and 1 person disconnects, it is possible that they will get connected while the modem is in a state of flux. Meaning that it has not finished resetting, and therefore can not take a call. Joe user is like ekkk, and complains to you the ISP. You tell him, everything is fine, and he connects then.
Now imagine it with a DS3 worth of callers (672) lines, and even more then that trying to connect. You can see where doing a Round Robin, or First Available can be better for you the ISP. It allows the modems proper time to reset, and therefore stop the half ass connections.
I have seen this a LOT with Ascend (Sorry Ascend people), not really with TC-Hubs as much. But, I am sure that it can happen.
Well, I hope that helps out some.
Enjoy,
Brian Smith CCNA, NCSA Network Support Engineer SOLUSERVE www.solunet.com 1571 Robert J. Conlan Blvd., Suite 110 Palm Bay, FL 32905 (888)449-5766 fax: (321)-676-1287
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