Methods and apparatus relating to transmission on physical channels, such as in networks on chips (NoCs) or between chiplets, are provided. One example apparatus generally includes a higher bandwidth client; a lower bandwidth client; a first destination; a second destination; and multiple physical channels coupled between the higher bandwidth client, the lower bandwidth client, the first destination, and the second destination, wherein the higher bandwidth client is configured to send first traffic, aggregated across the multiple physical channels, to the first destination and wherein the lower bandwidth client is configured to send second traffic, concurrently with sending the first traffic, from the lower bandwidth client, dispersed over two or more of the multiple physical channels, to the second destination.