MAYAH FLASHMAN II, Operating Manual

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Front panel user Interface > Menu structure
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© 2012 MAYAH Communications
Operating Manual for FLASHMAN II
3.5.4.4.6 User Interface
Here can be set if FLASHMAN II runs in either
· Expert Mode (default)
· User Mode (few menus are disabled)
3.5.4.4.7 Factory Default
This menu item allows to reset the FLASHMAN II to its factory defaults using
front panel user interface. Please consult the chapter
Useful Hints/How to reset
FLASHMAN II before using this function!
3.5.4.4.8 Timeouts
Here the following timeouts can be set:
·
Disconnect:
This timeout defines the period (in seconds) after which a connection is
dropped if no valid framing is achieved. Ideally, it should be set higher than
the Stat. framing timeout value.
Its default value is 45 seconds.
·
Stat. framing (usually just important at ISDN transmissions, not applicable to
FLASHMAN II)
This timeout defines the period (in seconds) after which MAYAH codec
switches automatically to G.722 SRT coding at non-IP-transmissions.
Generally, there are two methods to synchronize G.722 data streams.
G.722 with H.221 (in-band signalling)
H.221 uses a small amount of the data capacity (i.e.1.6 kbps of 64 kbps) to
transmit the synchronization information in-band. Although G.722/H.221 is a
recommended EBU standard, it’s not very widespread.
G.722 SRT (Statistical Recovery Timing)
Synchronization requires finding the start bit of every G.722 octet, and is
reached by evaluating the data pattern of the signals statistically. We DON’T
recommend that you use a pure sine wave signal whilst trying to achieve
synchronization, using G.722 coding! Mayah codecs can auto-detect a G.722/
H.221 data-stream since they evaluate the H.221 in-band signalling
information. However, as G.722 SRT signals do not have such signalling, only
switches to the G.722 SRT setting when the ‘G.722 timer’ expires and framing
has yet to be achieved. This G.722 timer starts once the first ISDN line is
connected.
It is recommended that the G.722 SRT timeout be set to ~30 Seconds. This
value is high enough not to interrupt any auto-detection process, but should
still be acceptable for framing up.
·
Remote ctrl
This timeout defines the period (in seconds) after which an idle IP remote
control session is closed automatically. The default value is 100 seconds.
Note:
This timeout can be helpful if a remote session was interrupted by the network
(e.g. faulty switch) and new remote control attempts are blocked by
FLASHMAN II since it is 'convinced' it is still remote controlled (but it isn't).