Telex MCE325 User Manual Page 31
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Separate shielded twisted pair cables: 50 feet (15.24 m). Balanced microphone input: up to 100
feet (30.48 m).
External Electret Microphone
An external electret microphone may be connected at the auxiliary connector and used in place of
a front-panel gooseneck microphone. Connect microphone high/bias to pin 15 and connect
microphone low to pin 2. When using an external microphone, do not connect a front-panel
gooseneck microphone.
Unswitched Microphone Output
The microphone audio is provided as an unswitched, balanced output at the auxiliary connector.
The in-phase signal is available at pin 1; the inverted-phase is available at pin 14.
External DC Power Source
The MCE325 may be powered from an external DC power supply in the 10 to 25 volt range (500
mA minimum).
If the external supply is in the 10 to 15 volt range, connect the positive lead to pin 13 of the
auxiliary connector and connect the minus lead to pin 10 or 11. A 0.5 Amp slo-blo fuse should be
connected in-line for 17 to 24 volt operation.
Remote Speaker Mute Control
When the MCE325 is used with an external speaker, the speaker may be muted from a remote
location. Applying a logic low signal to pin 25 of the auxiliary connector will cause muting.
Connect circuit common to pin 11.
Front Panel Headset Connections
Headset Requirements
Use headphones with an impedance of 25 ohms or greater. Low impedance 8 ohm headphones are
not recommended. Headphones with good acoustic isolation (20 to 40 dB) improve
communication in high ambient noise environments, and allow the user to use the headphones at a
less tiring, lower volume.
Headset Connections
Dynamic-microphone headset connector: XLR-6 type receptacle.
Table 2.8
Dynamic-microphone headset connector.
PIN # FUNCTION
1 Balanced mic low/unbalanced mic common
2 Balanced/unbalanced mic high
3 Headphone/mic switch common
4 Headphone left
5 Headphone right
6 Mic Switch high
- USER INSTRUCTIONS 1
- PROPRIETARY NOTICE 2
- COPYRIGHT NOTICE 2
- UNPACKING AND INSPECTION 2
- WARRANTY INFORMATION 2
- CUSTOMER SUPPORT 2
- RETURN SHIPPING INSTRUCTIONS 3
- TABLE OF CONTENTS 5
- Operation 3-1 6
- Maintenance 4-1 6
- Parts Lists 5-1 7
- Diagrams 6-1 7
- & S 9
- Front Panel Features 10
- Rear Panel Features 11
- Programming 12
- Mounting Configuration 12
- MCE325 Specifications 13
- MCS325 Specifications 14
- Figure 1.5 15
- Figure 1.3 15
- Figure 1.4 15
- Figure 1.6 16
- Figure 1.7 16
- Figure 1.8 17
- Figure 1.9 17
- Figure 1.10 18
- Figure 1.11 19
- 1-12 MCE325 User Instructions 20
- NSTALLATION 21
- Top cover removal 22
- Table 2.2 23
- Figure 2.2 24
- ISO (DS5) 25
- Remote Talk-off (DS7) 25
- VOX (DS8) 25
- Mechanical Installation 26
- Figure 2.3 27
- Electrical Installation 28
- Program Inputs, J14 and J15 29
- External Speaker, J27 29
- Auxiliary Connector, J22 29
- Remote Microphone Switch 30
- ISO Connection 30
- External Headset 30
- PIN # FUNCTION 31
- Table 2.9 32
- PERATION 33
- Microphone On/Off 34
- Speaker On/Off 34
- Volume Adjustment 34
- Front Panel Programming 35
- 3-4 CSI-200 User Instructions 36
- Instant Mic 37
- 3-6 CSI-200 User Instructions 38
- AINTENANCE 39
- Cleaning 40
- Test Equipment 40
- Power Supply Test 40
- Initial Configuration 41
- Keying Output Test 41
- Four-Channel, Two-Wire Mode 42
- Two-Channel, Four-Wire Mode 43
- True Sidetone Adjust 44
- Headphone 44
- Program A to Left Headphone 45
- IFB Test 46
- Panel Mic to Channel Test 48
- Carbon Mic to Channel Test 48
- VOX Test 48
- Mic Kill Receive Test 48
- Mic Kill Transmit Test 49
- Call Transmit Test 49
- Call Receive Test 49
- ISO Test 50
- Remote Mic Switch Test 50
- Program Lockout Test 50
- Noise Checks 50
- CSI-200 User Instructions 52
- Table 5.1 53
- Table 5.2 53
- Table 5.3 54
- Table 5.4 55
- Table 5.5 55
- Table 5.6 55
- Table 5.7 65
- S ECTION 67
- 6-2 CSI-200 User Instructions 68
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- TELETELEXX 82
- 9027624501 83
- Title: D:\TEMP\SD6246_01A.cal 85
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