Unfortunately that Components and Cables document is very much out of date. The latest version 5.0 (which is due for a refresh) can be found here using a partner login: Cisco TelePresence SX Series - Technical References - Cisco
Here are the specs on the SX20 microphone, which is also used for MX200/300 Gen 1 and G2, as well as C20:
CISCO Performance Mic 20 Specifications
Description
- Intuitive mute function directly on microphone with status indicator
- Omni-directional, boundary microphone.
- Excellent RF resistance and low self noise.
- 3.5 mm four-pin mini-jack connector and 7.5 meter cable.
- Robust and well suited for long-term meeting room use.
Technical specification
- Directivity: Omni-directional (uniform in hemisphere above boundary)
- Frequency response: 80-15 kHz | 80-3 kHz ± 3dB | 80-15 kHz ± 6dB
- Sensitivity: -35dB ±3dB rel. 1V/Pa.
- Max SPL: 110dB (3% THD @ 1kHz)
- Self-noise: < 29 dBA , > 65 dB SNR (Signal to Noise Ratio)
- Mic. output: Differential
- Phantom power: 12 V
- Output connector: 4 pin 3,5 mm mini-Jack (Shield: GND / ring 2: mute detect / ring1: signal - / Tip: signal +)