 
 <prompt> text: ```Integrated Services Digital Network (ISDN) na one set of communication standards wey dey allow make voice, video, data, and other network services dey transmit at the same time over di traditional circuits of di public switched telephone network. Dem first define am for 1988 for di CCITT red book. Before ISDN, people dey see telephone system as just for voice, with some special services for data. Di main thing wey ISDN get na say e fit join speech and data for di same lines, and add features wey no dey available for di classic telephone system. Di ISDN standards define different kinds of access interfaces like Basic Rate Interface (BRI), Primary Rate Interface (PRI), Narrowband ISDN (N-ISDN), and Broadband ISDN (B-ISDN).

ISDN na circuit-switched telephone network system, wey also allow access to packet switched networks, wey dem design make e fit allow digital transmission of voice and data over ordinary telephone copper wires, wey fit give better voice quality pass analog phone. E dey offer circuit-switched connections (for voice or data), and packet-switched connections (for data), for increments of 64 kilobit/s. For some countries, ISDN dey useful for Internet access, where e fit provide maximum of 128 kbit/s bandwidth for both upstream and downstream directions. Channel bonding fit make data rate higher; typically di ISDN B-channels of three or four BRIs (six to eight 64 kbit/s channels) dey bonded.

1. When ISDN first define?
2. Where?
3. Wetin e mean?
4. E support video?
5. Wetin else?
6. Wetin be di main feature?
7. E dey available before?
8. Wetin BRI mean?
9. Wetin kind of interface BRI be?
10. You fit name other kinds?
11. Wetin be di name of two others?
12. Wetin kind of switches ISDN dey use?
13. You fit use any others?
14. Which one?
15. Wetin e dey do?
16. Wetin kind of wire dem dey use?
17. E lead to better or worse quality?
18. How many kilobits dem dey use?
19. Wetin be di max bandwidth?
20. E dey for both directions?
21. Wetin fit make rate higher?
22. How many dem dey bond?``` <response>: ```1. 1988
2. for CCITT red book
3. Integrated Services Digital Network
4. yes
5. speech
6. e dey combine speech and data for di same lines
7. no
8. Basic Rate Interface
9. access interface
10. Yes
11. Narrowband ISDN (N-ISDN), and Broadband ISDN (B-ISDN)
12. circuit-switches
13. Yes
14. packet-switched
15. e dey carry data
16. copper
17. Better
18. 64 kilobit/s
19. 128 kbit/s
20. yes
21. Channel bonding
22. three or four``` 