2-5
Cisco VG30D Voice Gateway User Guide
OL-19276-01
Chapter 2 Installation
Back Panel Equipment
Port 1 & Port 2
Each port has three connectors. The two BNC connectors, which are 75-ohm unbalanced, are marked
Rx
and
Tx
. The RJ45 connector is 120-ohm balanced. Ensure the Impedance Switch is set to the correct
impedance. You can configure parameters for each port using the Gateway Management Interface on a
Web browser.
Craft Port
The Craft Port exists primarily to enable a serial connection to a dumb terminal or a terminal emulation
application on a computer that is running RS-232 at 9600 baud, 8 bit, 1 stop bit, and no parity.
Alarm Port
If required, you can connect the Cisco VG30D Voice Gateway
Alarm
Port to an alarm signal detector
before powering on the unit.
Switches
Power On/Off
The power On/Off switch (
I / O
) is adjacent to the mains connector.
Caution
Before connecting any cables or changing any switches, power off the Cisco VG30D Voice Gateway.
POST
You must set the Power On Self Test (
POST
) switch in the
POST
position before powering on the Cisco
VG30D Voice Gateway unit. Only Cisco Systems, Inc., engineers use the
Factory
position.
Impedance Switches
This allows the selection of either 75-ohm or 120-ohm impedance for the SCN ports. Use 75 ohms for
coaxial BNC connection (
BNC
position), and 120 ohms for UTP RJ45 connectivity (
RJ45
position).
Caution
Make this selection before power is applied to the unit.
Craft Switch
Use the Craft switch to switch between serial connection for initialising the Cisco VG30D Voice
Gateway and Factory Engineering management. By default, the switch should stay set to
Craft
.
Содержание VG30D
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Страница 112: ...E 2 Cisco VG30D Voice Gateway User Guide OL 19276 01 Appendix E Useful Information Maintenance Replacement ...
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