1. What is the e1 crc configuration on E1 controllers?
Ans : CRC 32
2. How many time slot in T1 and E1?
Ans: 24 on T1 -32 on E1
3. What is the Delta or D channel 16 kbps digital line used for in an ISDN connection?
Ans. Delta (D Channel) Channel is 16kbps
D (Delta) channel: 16 kbps
D-channel takes care of call set-up, call control (call forwarding, call waiting, etc.), and maintenance
Control and maintenance can be done in real-time in D-channel while B-channel is still transmitting data.
4. Define Basic Rate Interface (BRI)?
Standard ISDN line comprised of 2 B-channels and 1 D-channel.
5. Calculation for E2/ E3/ E4 and T2/ T3/ T4?
As I understand, the E1/ T1 calculation is as follow:-
E1 = Numbers of Bit X Total Numbers of Timeslot X Sampling Rate
= 8 Bits X 32 Timeslots X 8KHz
= 256 Bits X 8 KHz
= 2048Kbit/s
T1 = Numbers of Bit X Total Numbers if Timeslot + 1 Bit X Sampling Rate
= 8 Bits X 24 Timeslots + 1 Bit X 8KHz
= 192 Bits +1 Bit X 8KHz
= 193 Bits X 8KHz
= 1544Kbit/s
E2 = 8448Kbit/s
E3 = 34368Kbit/s
E4 = 139264Kbit/s
T2 = 6312Kbit/s
T3 = 44736Kbit/s
T4 = ?
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