So regarding line bandwidth, which of the following statements are correct ?

The main link of a company’s MSR router is the synchronous asynchronous serial port, which is connected to the operator’s network through a V.35 cable; the router also uses an ISDN BRI interface as a backup link.

So regarding line bandwidth, which of the following statements are correct ? (Multiple Choice)
A .  The bandwidth of the backup line may be 64Kbps
B .  The bandwidth of the backup line may be 128Kbps
C .  The bandwidth of the backup line may be 144Kbps
D .  The bandwidth of the main link may be 1Mbps

View Answer

Answer: ABD

Explanation:

Two access methods of ISDN :

BRI interface → 2B + DB channel 64kbps D channel 16kbps maximum rate 144kbps

PRI interface → E1 30B + D maximum rate 2Mbps

T1 23B + D maximum rate 1.544Mbps

The B channel is used to transmit data, and the D channel is used to transmit control signaling, so the BRI provides a maximum bandwidth of 128 kbps (the amount of data that can be transmitted per unit time)

V . 24 Support same and asynchronous: asynchronous maximum rate 115kbps synchronous maximum rate 64kbps

V . 35 only supports synchronization: the highest rate is 2048000bps = 2Mbps