Chapter 1 Introducing the VOP1372G
VOP1372G-61 User’s Guide
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Alarm LED
An ALM (alarm) LED lights when the VOP is overheated, the voltage readings are outside the
tolerance levels, or there is a hardware failure.
System Error Logging
The system error log will record error logs locally to the management switch card memory.
Remote Firmware Upgrade
You can use FTP or SFTP to perform configuration backup/restore and firmware upgrade from a
remote location.
Voice Compression and Decompression
The VOP supports the following voice codecs.
• G.711 A-law
• G.711 µ-law
• G.723.1
• G.726 (40, 32, 24 and 16 kbps)
• G.729AB
Out-of-Band POTS Signaling
As well as transmitting and receiving voice band data, the VOP can communicate with the
subscriber’s phone using out-of-band signals.
Call Progress Tones
The VOP can provide the following tones to connected telephones:
Table 1 Out-of-Band POTS Signaling
SIGNAL DESCRIPTION
Off Hook The subscriber intends to start a call.
On Hook The subscriber terminates the call.
Flash Short on-hook “tap” for special call functions.
Pulse Dial Dialing method using an interrupted signal.
Ring AC power signal from FXS port indicating a phone call attempt from remote party.
Tip/Ring Reversal FXS port reverses the voltage between the tip and the ring
Metering Tone FXS port sends a 12 /16kHz out-of-band sine wave for payphone use.
Table 2 Supported Tones
TONE INDICATION
Dial tone A line is available for use.
Busy tone The dialed number is unreachable.
Congestion tone There are not enough resources to handle a call.
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