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MIO–CCE–4K/3G
SMPTE ST 2110/4K/3G/HD/SD Closed Caption Encoder with Media–to–IP Streaming
7.1.8.
How Can I Block Upstream Captions?
Depending on the user's specific needs, there are many ways to accomplish this. If all upstream captions
are to be blocked, the recommended approach is to issue the serial port commands ^A6 F1 and ^A6 F2 to
place both Field 1 and Field 2 into NULL STATE. See section 6.3.13.
If only a particular data channel is to be blocked, such as Text Channel 2, execute the serial command ^A6
T2 to place this particular channel in NULL STATE. To block all upstream XDS material, issuing ^A6 TX
will put only the XDS stream into NULL STATE. Presently there is no way to block specific XDS packet
types, unless these are being replaced with updated packets of the same type by the caption encoder. If
an entire field is to be blocked, use ^A6 F2 to place all of Field 2 in NULL STATE.
7.1.9.
How Can I Pass Upstream Captions?
If upstream captions are being blocked, the user's captioning software might have failed to relinquish control
of the encoder so upstream captions may pass.
If captioning software is leaving the unit in DIRECT STATE or REAL TIME STATE or NULL STATE when
it is sitting idle, this issue must be resolved in the caption software itself.
7.1.10.
My Modem Connection Hangs-Up Unexpectedly
The following can cause unexplained hang-ups on a modem connection:
RAIN - If there has been any significant rainfall during this time, moisture can get into the lines and cause
power hums and other sorts of phenomenon. This can cause the DC level of the phone line to vary, which
modems can interpret as loss of carrier.
DISTANCE - If the captioner is a long distance from the CO (Central Office) where they are near the limit
of transmission, dropouts can occur if there is not a line booster in place. If there is a line booster, this can
also be a problem if there are grounding issues, etc.
CAPTIONERS MODEM - If the initialization string is setup incorrectly, this can cause the modem to not
function correctly. The user may want to check the modem manufacturer for the recommended set-up for
their particular modem so it is capable of operating in the 1200 to 2400 baud range. Some people that use
US Robotics 57.6k modems have reported difficulties connecting at lower baud rates due to these setup
strings.
OTHER SOFTWARE - If there is any other software on the system that uses the modem, it may have
changed the initialization string or be interfering with the modem. On computers that use a COM-port
mouse, the mouse may also interfere with the modem operation if it is configured incorrectly.
READ THE MANUAL - Be sure the captioners know their system inside and out. They should, at minimum,
be able to supply what their system configuration is.
CALL WAITING - If this service is installed on the captioner's phone line, it MUST be disabled before using
the modem. If an outside caller tries to call the phone line that the modem is connected to, the tone that is
generated will disrupt modem communications, resulting in loss of carrier.
ONLY CONNECT TO POTS (Plain Old Telephone System) - For a reliable telephone connection to the
caption encoder a direct telephone line must be used. This line must not pass through a PBX or similar key
device.
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Revision 1.0
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