Appendix D
Memory Tables Answer Key
Chapter 2
Table 2-2 Speed of Sound Through Four Common Mediums
Medium |
Speed (Meters per Second) |
Speed (Feet per Second) |
Speed Factor |
|---|---|---|---|
Air |
344 |
1130 |
1 |
Water |
1480 |
4854 |
4.3 |
Concrete |
3400 |
11,152 |
9.8 |
Gypsum Board |
6600 |
22,305 |
19.6 |
Table 2-3 Audio Codecs Commonly Used by Cisco
Codec and Bit Rate (Kbps) |
Codec Sample Size (Bytes) |
Codec Sample Interval (ms) |
Mean Opinion Score (MOS) |
Voice Payload Size (Bytes) |
Bandwidth MP or FRF.12 (Kbps) |
Bandwidth Ethernet (Kbps) |
|---|---|---|---|---|---|---|
G.711 (64 Kbps) |
80 |
10 |
4.1 |
160 |
82.8 |
87.2 |
G.729 (8 Kbps) |
10 |
10 |
3.92 |
20 |
26.8 |
31.2 |
G.723.1 (6.3 Kbps) |
24 |
30 |
3.9 |
24 |
18.9 |
21.9 |
G.723.1 (5.3 Kbps) |
20 |
30 |
3.8 |
20 |
17.9 |
20.8 |
G.726 (32 Kbps) |
20 |
5 |
3.85 |
80 |
50.8 |
55.2 |
G.726 (24 Kbps) ... |
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