TUSB212: Cable length

Hi,

Thank you for your reply.

I understand that the 3m pre-channel(host) and 5m post-channel(device) could work depending on cable quality.

by the way, what is the max cable length for pre-channel and post-channel with high quality cable?

Do you have any result such as TI Design or documentation ?

Best Regards,

ttd

Hi ttd,

Max distance would also depend on USB data source drive strength and signal quality. In most cases the 5m/3m case is the max distance with TUSB212. TUSB216 is our latest USB 2 redriver with the most redriving capability and could possibly work in the 5m/5m cases. What is your application?

Hi,

Thank you for your reply.

I understand that  "TUSB212  could work  both "Pre 5m/Post 3m" and   "Pre 3m/Post 5m" for max distance" and  "TUSB216  could work  both "Pre 5m/Post 5m" and   "Pre 5m/Post 5m" for max distance".

I would like to confirm just in case.

According to TUSB216 datasheet, max distance for post-channel is 4m.

Can post-channel work for 5m when USB data source drive strength and signal quality are high? 

My application is industrial PC.

Best Regards,

ttd

Hi ttd,

Sorry there was a typo in my last message it should read "5m/4m". 

Hi,

Thank you for your reply.

I'd like to design USB board based on datasheet specification. It means the "5m/4m"of TUSB216 isn't satisfied with my target to avoid risk. 

Is it possible to use USB HUB instead of TUSB212/6 for 5m/5m?

Target USB HUB is 1 port HUB or 2 port HUB.

http://www.ti.com/interface/usb/hubs-controllers/products.html#p404=USB2&p365=480;10000&p1694=Hub

Best Regards,

ttd

Hi ttd,

It is possible to use a USB Hub to meet the 5m/5m condition, TUSB4020BI is suitable for this. However I would also like to mention that more than on USB 2 redriver can be used in the link to help achieve longer implementations. What is your expected pre and post channel for this industrial PC design? 

Hi,

Thank you for introducing TUSB4020BI. 

I think TUSB21x is simple solution to extend the cable length than USB HUB.

Industrial PC (Host)⇔TUSB212 or TUSB216(my board) ⇔ Keyboard(Device).

Best Regards,

ttd

Hi,

Is there any additional information for TUSB21x and TUSB4020BI for extending cable length 5m / 5m such as documantaion or the measurement result with EVM?

I send my email address through message.

Best Regards,

ttd 

Hi,

> I would also like to mention that more than on USB 2 redriver can be used in the link to help achieve longer >implementations.

Is it possible to extend two TUSB216 on the same board for 5m / 5m?

Datasheet show that "Supports up to 10-m cable length with two TUSB216 devices". Which configuration mean two TUSB216 on the same board or separate board?

In my case, I'd like to use same board for 10-m.

Separate board for 5m/3m/2m is just example. If you have configuration for separate board for 10m, could you share it?

I already check this e2e. 

https://e2e.ti.com/support/interface/f/138/t/873193  

Best Regards,

ttd

Hi,

I revised previous post. Could you see it?

Thank you for your cooperation.

Best Regards,

ttd

Hi ttd,

In this application both TUSB216 are configured for BOOST3 using a high quality cable. you could buy a TUSB216EVM to experiment with this application. 

Signal source --> TUSB216--> 10m cable --> TUSB216.

Hi,

Thank you for your reply.

>In this application both TUSB216 are configured for BOOST3 using a high quality cable

Does your comment include two TUSB216 the same board  with high quality cable? 

>Signal source --> TUSB216--> 10m cable --> TUSB216.

→Does this mean as follow with EVM?

https://e2e.ti.com/support/interface/f/138/p/873193/3231449?tisearch=e2e-sitesearch&keymatch=tusb216%2010m#3231449

I confirm the spec for cable length(4m(min) between Host and TUSB216) with application.

I will try to  implement "Pre 4m / Post 5m" with TUSB216 when swapping D1 and D2 based on your comment of TUSB212 on previous post one way to implement application.

>When using TUSB212 D1 ad d2 can bw swapped but DP must connect DP and DM must connect to DM. The 3m pre-channel and 5m post-channel could work however >performance would vary depending on quality of the cable.  

Best Regards,

ttd,

Hi 

>No i do not recommend the above application with Boost 3 as it could have boost noise or oscillations in the signal >both TUSB216 may need to be set to lower setting depending on eye diagram.

→OK, I avoid to implement two TUSB216 on the same board.

I will try to  implement "Pre 4m / Post 5m" with TUSB216 when swapping D1 and D2 based on your comment of TUSB212 on previous post one way to implement application.

■About 10m cable

I will check EVM for long cable distance with EVM.

When you test before for 10m cable , how long did you use cable for "①cable" and "②cable"?

USB Hub or Host --> ①cable-->  TUSB216 --> 10m Cable --> TUSB216 -->②cable  --> Device

Unfortunately, I can't place TUSB216 on HOST board(PC) and Device board(Keyboard).

I will buy both PC and Keyboard are ready‐made goods(I don't design).

Best Regards,

ttd

Hi,

Is it possible for you to test 4m / 5m with TUSB216EVM easily?

It takes a time to get TUSB216EVM, however I need to decide either TUSB216 or USB HUB soon.

If you share the test result and configuration, it is helpful for me. 

Maybe I guess you faces lab access limitation because of corona virus situation...

Best Regards,

ttd

Hi ttd,

Sorry for the late reply. Unfortunately there any some limitations with the COVID situation. I will try to collect some data next week and share mid next week. Is this okay?

Hi,

Thank you for your reply.

Please keep your safety during the COVID situation. It's ok at your convenience after lifting out restrictions.

Best Regards,

ttd

Hi,

Thank you for your reply.

I understand your situation. Could you close this E2E?

If I have other question , I will post again.

Be careful of coronavirus!

Best Regards,

ttd