A new business in Great Britain needs to have a PSTN connection that will handle a maximum of 30 inbound and outbound calls at any given time. The customer only has one slot available on the designated PSTN router. Which digital line type will you recommend?
A.
ISDN T1 PRI
B.
QSIG
C.
ISDN E1 PRI
D.
ISDN BRI
Explanation:
The ISDN E1 PRI has 32 timeslots (channels). Each timeslot is 8 bits and has a data rate of 64,000 bits/second. Timeslot 0 is used for frame synchronization and alarms. Timeslot 16 is used for signaling so we can use 30 timeslots to carry calls.ISDN T1 PRI only has 24 timeslots and can not support 30 simultaneous calls.
QSIG is just an ISDN based signaling protocol for signaling.