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Covid-19 & Returns: Due to Covid-19, certain manufacturers we carry are no longer accepting returns on their products until further notice and they are only offering replacements if an item is not working. Please feel free to contact us via phone or email to confirm the return policy on any item you might be interested in before purchasing on our website.
- Provides 2 BRI S/T (4-wire) interfaces for network or station side ISDN connections
- BRI S/T network connections require an external NT-1 device for each BRI line connected to the TBSU
- Mounts on DK40i main ksu only
- Only one of the following can be mounted in the base KSU: TCOU, TDDU, TBSU, TBUU
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