D15329.08 SX20 Administrator Guide CE9.2, NOVEMBER 2017.   www.cisco.com — Copyright © 2017 Cisco Systems, Inc. All rights reserved. 
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Cisco TelePresence SX20 Quick Set  Administrator Guide
Audio connectors (mini-jack)
Microphone Line-in Line-out
Connector pin out Tip = Hot 
Ring 1 = Cold 
Ring 2 = Mic. control 
Shield = GND
Tip = Left channel 
Ring = Right channel
Shield = GND
Tip = Left channel 
Ring = Right channel
Shield = GND
Signal type Balanced Unbalanced Unbalanced
Connector (codec) Mini-jack  3.5 mm, 
4-conductor
Mini-jack  3.5 mm,   
3-conductor
Mini-jack  3.5 mm, 
3-conductor
Input impedance 1.5 k Ohm/ leg 18 k Ohm N/A
Output impedance N/A N/A 100 Ohm
Maximum input level -18.3 dBu  ±2 dB 9.0 dBu  ±2 dB N/A
Maximum output level N/A N/A 8.2 dBu  ±2 dB
Phantom power 11 V  ±1 V N/A N/A
Phantom power resistor pin ”tip” 1.7 kOhm N/A N/A
Phantom power resistor pin ”ring 1” 1.7 kOhm N/A N/A
Frequency response 20 Hz-20 kHz  ±1 dB 20 Hz-20 kHz  ±1 dB 20 Hz-20 kHz  ±1 dB
Signal to Noise Ratio -85 dB -95 dB -95 dB
3.5 mm mini-jack, 4-pin 
(microphone)
Audio – Hot
Microphone control
Audio – Cold
Ground
Camera connector pin-out
External view of socket
Pin: 2    4               16  18           22  23  24
Pin: 1    3                 17   19          20       21
HDMI pin-out
External view of socket
Pin: 2    4               16  18
Pin: 1    3                 17   19
3.5 mm mini-jack, 3-pin 
(line-in/line-out)
Left channel
Right channel
Ground
Camera connector and 
HDMI pin-out *
Pin Assignment
1 TMDS Data 2+
2 TMDS Data 2 Shield
3 TMDS  Data  2  –
4 TMDS Data 1+
5 TMDS Data 1 Shield
6 TMDS  Data  1  –
7 TMDS Data 0+
8 TMDS Data 0 Shield
9 TMDS Data 0–
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock-
13 CEC
14 Reserved (N.C. on device)
15 SCL
16 SDA
17 DDC / CEC Ground 
18 +5 V Power (max 50 mA)
19 Hot Plug Detect 
20 +12 V Power (max2 A)
21 Ground
22 RS232 Level (output)
23 Ground
24 RS232 Level (input)
Shell Ground
DVI-I socket pin-out
External view of socket
DVI-I socket pin-out 
Pin Assignment
1 TMDS data 2-
2 TMDS data 2+
3 TMDS data 2  /4 shield
4 TMDS data 4-
5 TMDS data 4+
6 DDC clock
7 DDC data
8 Analog vertical sync
9 TMDS data 1–
10 TMDS data 1+
11 TMDS data 1  /3 shield
12 TMDS data 3-
13 TMDS data 3+
14 +5 V
15 Ground
16 Hot plug detected
17 TMDS data 0-
18 TMDS data 0+
19 TMDS data  0/5 shield
20 TMDS data 5-
21 TMDS data 5+ 
22 TMDS clock  shield
23 TMDS clock+
24 TMDS clock-
C1 Analog red
C2 Analog green
C3 Analog blue
C4 Analog horizontal sync
C5 Analog ground
* 
HDMI has only pins 1 - 19; the 
camera connector has pins 1 - 24.
This page shows the pin-out schemes for the SX20 audio, video and camera connectors.
Connector pin-out schemes