215 Huron network switch upgrade

We will be testing a replacement network switch for VoIP for 215 Huron on Wednesday June 5 from 3:30pm-4:00pm.  Users in 215 Huron may experience short wired network outages during that time.  If all goes well then on Thursday June 6 from 3-4:30pm we plan to move everyone to the new switch.

The UofT wireless network will not be affected by our switch upgrade.

Departmental VoIP Information Page

The Departmental VoIP Information Page is now available.

PGB network switch upgrades on Monday, June 3, 2019 from 11am to 1pm

In order to be ready for VoIP, we will be upgrading the network switches in PGB on Monday, June 3, 2019 from 11am to 1pm.  Network connections will be temporarily unavailable while we do the upgrades.  If all goes smoothly we expect to have just two 10-15 minute outages to complete the transition.

Network switch upgrades on Wednesday, May 1 from 11am to 3pm

We will be upgrading the last four network edge switches for our main math network in Bahen on Wednesday, May 1st from 11am to 3pm.  The following offices will be affected:

BA6120 BA6191 BA6193 BA6200 BA6202 BA6204 BA6206 BA6208 BA6209
BA6211 BA6212 BA6214 BA6216 BA6218 BA6224 BA6226 BA6228 BA6230
BA6232 BA6234 BA6236 BA6242 BA6244 BA6246 BA6248 BA6250 BA6252
BA6256 BA6258 BA6260 BA6262 BA6264 BA6266 BA6268 BA6270 BA6283
BA6290 BA6290A BA6290A BA6290C BA6290G BA6290G BA6290J BA6291

The lw2 and lw3 printers will be affected by these outages, so they will be unavailable while their network connections are being upgraded.

The Computer Room (BA6200), as listed above, will also be affected.

Power outage at Bahen

At approximately 19:30 on Thursday April 4th there was an extensive power outage across campus which also affected the Bahen building. Power to Bahen returned at approximately 20:15, and efforts to restart the computer systems at the Mathematics Department commenced at 20:30. All systems were back online by 22:15.

Default resolution for Ricoh scanning is now 400dpi

Since the scanning done on the Ricoh photocopiers in BA6290A and PG104A is primarily for Crowdmark and the photocopiers had different resolution defaults we decided to make them the same.  It was suggested that 400 dpi would be good, so we have done that.  If you think that 300 dpi would be a better default please let us know.

There seems to be no way to change the default contrast setting and whether one wishes to have the scanning set to one- or two-sided on these photocopiers.

Short network outage for some rooms on Wednesday 2019mar20 from 4:15-5:00pm

On Wednesday March 20 during the server upgrade time from 4:15-5:00pm we will be testing one of the new switches that we will be installing for VoIP.  People in the following rooms will be affected:

BA6102  BA6103  BA6104  BA6106  BA6107  BA6108  BA6110  BA6112  BA6114  BA6116  BA6118

This will be a short test and we expect that computers in those offices will not be without network connections for more than 15 minutes.

Networking Hardware Update for VoIP

We will be updating our networking hardware in the near future so that our department can more easily join the new VoIP telecommunications system that UofT has selected. We have to change many network switches and there will be two-hour windows when network connections for some people will stop working. Occassionally there will be short (less than 10 minutes) network outages for whole networks.

Information about the schedule for these outages will be posted on this blog.

For more information about the UofT VoIP project please see:


New (simplified) AV system in BA6183

[There is a summary of how to use our new AV setup at the bottom of this post.]

As many people noticed the matrix switcher for the AV system in BA6183 was failing at the end of last year so just before the break we replaced it and simplified the configuration in that room.  Now there are only two choices for inputs, the built-in computer or a laptop connected on the white panel above the touchscreen.  By default the computer will be displayed, but if a laptop is connected then that will take precedence and the system will automatically switch to displaying that (assuming that the laptop is set to display to its video port).  The laptop can be connected via HDMI (the recommended connection) or VGA (for very old systems).  After disconnecting a laptop the system will automatically switch to displaying the computer again.

We have adapters to change to HDMI from USB-C (untested) or Mini DisplayPort or DVI-D, and an HDMI and a DVI-D cable and a Wireless Presenter with Laser Pointer if needed in the green basket available from the front desk.  As always we strongly recommend that you test that things work as expected at least 24 hours in advance of using the equipment in BA6183.  Changing hardware and software sometimes causes incompatibilities between a laptop and our system.  Using the computer with a USB flash drive usually works with fewer issues.  A VGA cable should be available on the podium.

The USB connectors to the computer (in case you bring just a USB flash drive) are now loose and are labelled and have green tape on them.

You still need to use the touchscreen to activate the screens and projectors.


  1. It is no longer possible to use an extended desktop on the projected screens; whenever two screens are displayed they will be duplicates.
  2. The audio system was not reconnected.  We are looking into getting that functionality back.
  3. Only the computer and laptop inputs work now since the new switcher is much simpler and smaller.
  4. The image aspect ratio is only 4:3 (since our projectors are quite old and that is the aspect ratio of our screens) and the resolution is fixed to prevent interoperability issues with video renegotiation.
  5. HDCP had to be disabled since our hardware is too old which means that HDCP-enabled digital content (much high definition content is protected this way) cannot be displayed.


  1. Log in on the touchscreen to activate the system (the code is available from the front desk).
  2. Choose Computer or Laptop (it does not matter which since a laptop will always have priority over the computer).  If you need the account/password information for the computer please ask at the front desk.
  3. Select whether you wish to display on either the Left or Right (as viewed from the audience) or Both screens.
  4. If you do not connect a laptop the computer desktop will be displayed.  You can use the loose USB ports that have green tape on them if using the computer.
  5. If you connect a laptop its display will take precedence and the laptop screen may adjust its resolution and aspect ratio to that of the projectors.

Bell Centrex system to be replaced by VoIP – Update about 5-digit dialing

As was mentioned in an earlier post the University is moving away from the Bell Canada Centrex system to a BroadConnect Telecom VoIP system.  Many departments have already moved over and our department will be piloting this system very soon in preparation to moving everyone over in the new year.

One consequence of the presence of two different systems on campus is that those of us still on the Centrex system have to use 9 plus the full 10 digit telephone number to call anyone who has already moved to the VoIP system (for example, people in Engineering or Computer Science).  The usual 5-digit dialing still works between two Centrex users (or between two VoIP system users).

The main University website for this changeover is VoIP at U of T.