📡 T1 PDH Quiz
Plesiochronous Digital Hierarchy - Communication Engineering
12 Questions
Undergraduate Level
Post-Test Review
1
What is the line rate of a T1 (DS1) carrier in the PDH hierarchy?
2.048 Mbps
1.544 Mbps
6.312 Mbps
44.736 Mbps
2
How many DS0 channels (64 kbps voice channels) does a T1 line carry?
30 channels
24 channels
32 channels
16 channels
3
What is the total frame size of a T1 frame including the framing bit?
192 bits
256 bits
193 bits
125 bits
4
How many frames are grouped together in a Superframe (SF/D4) format?
24 frames
12 frames
16 frames
8 frames
5
Which line coding scheme for T1 replaces 8 consecutive zeros with the pattern 000VB0VB to maintain ones density?
HDB3
AMI with ZCS
B8ZS (Bipolar 8-Zero Substitution)
Manchester coding
6
In Extended Superframe (ESF) format, how many frames make up one extended superframe?
12 frames
24 frames
16 frames
32 frames
7
What is the frame repetition rate (frames per second) in T1 transmission?
8000 frames/second
4000 frames/second
16000 frames/second
2000 frames/second
8
In ESF framing, what are the three functions of the 193rd bit position?
Frame synchronization, Error detection (CRC-6), and Facility Data Link (FDL)
Terminal framing, Signaling framing, and Error correction
Bit stuffing, Justification, and Synchronization
A-bit, B-bit, and C-bit signaling only
9
What technique is used in T1 Superframe format to transmit signaling information without using a separate channel?
Common Channel Signaling
Robbed-bit signaling (using LSB of frames 6 and 12)
Time Slot 16 signaling
Datalink signaling via FDL
10
What is the payload data rate of a T1 line (excluding overhead)?
1.544 Mbps
1.536 Mbps
1.600 Mbps
1.344 Mbps
11
What is the maximum number of consecutive zeros allowed in a T1 AMI line code to maintain clock synchronization?
15 consecutive zeros
8 consecutive zeros
4 consecutive zeros
No limit with AMI
12
In the T-carrier hierarchy, what is the bit rate of the T3 (DS3) level that multiplexes 7 T2 signals?
44.736 Mbps
6.312 Mbps
274.176 Mbps
34.368 Mbps
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