ZyXEL Communications VOP1372G-61 User Manual page 10

Chapter 1 Introducing the VOP1372G
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.
Table 1 Out-of-Band POTS Signaling
SIGNAL
Off Hook
On Hook
Flash
Pulse Dial
Ring
Tip/Ring Reversal
Metering Tone
Call Progress Tones
The VOP can provide the following tones to connected telephones:
Table 2 Supported Tones
TONE
Dial tone
Busy tone
Congestion tone
10
DESCRIPTION
The subscriber intends to start a call.
The subscriber terminates the call.
Short on-hook "tap" for special call functions.
Dialing method using an interrupted signal.
AC power signal from FXS port indicating a phone call attempt from remote party.
FXS port reverses the voltage between the tip and the ring
FXS port sends a 12 /16kHz out-of-band sine wave for payphone use.
INDICATION
A line is available for use.
The dialed number is unreachable.
There are not enough resources to handle a call.
VOP1372G-61 User's Guide