Briefly explain the difference between ADSL and ISDN.

ADSL (Asymmetric Digital Subscriber Line) is a type of broadband internet connection that uses existing telephone lines to transmit data at high speeds. It allows for faster download speeds than upload speeds.

ISDN (Integrated Services Digital Network) is a digital communication technology that allows for the transmission of voice, video, and data over traditional telephone lines. It provides faster and more reliable connections than traditional analog phone lines.

ADSL (Asymmetric Digital Subscriber Line):

- Asymmetric bandwidth (higher downstream, lower upstream)
- Uses existing copper telephone lines
- Relatively low speed (typically up to 24 Mbps downstream)
- Lower cost and widespread availability

ISDN (Integrated Services Digital Network):

- Symmetric bandwidth (equal downstream and upstream)
- Uses separate digital telephone lines
- Higher speed (typically up to 128 kbps per channel)
- Lower latency (delay)
- More reliable and secure than ADSL
- Higher cost and less availability than ADSL