There are two types of integrated DS1. Prior to recent technological advancement, which resulted in the availability of dynamic integrated DS1, the only available form of integrated DS1 was channelized integrated. Channelized T1 is comprised of 24 (64 kbps each) autonomous channels. Each of these independent channels can support different applications simultaneously. Once channelized T1 is configured, the channels are fixed. With channelized T1, for example, if 12 of your 24 channels are allocated to local phone service, and the other 12 channels (768 k) are allocated to internet data, then 12 channels will not be available on the data side, regardless of whether one or twelve of the phone lines are in use. With this example, your data speed can never exceed 768 k, regardless of how many phones are, or are not, in use. Some now consider this a waste of bandwidth. With dynamic integrated, all bandwidth is initially assigned to the data side, and then used for phones only when needed.
Other advantages of channelized DS1 can include; one provider, one easy to read bill and one point of contact for all of the above mentioned services, flexibility in keeping your same phone numbers, much lower costs than if the above applications are purchased individually on separate T1 lines, and the flexibility to evolve as your business grows. Channelized DS1 is commonly confused with dynamic integrated T1, and occasionally confused with fractional t1. In actuality, one channelized DS1 circuit can include the functionality of multiple fractional T1 services, for far less money.