Tieline Merlin PLUS User Manual page 306

306 Merlin PLUS WNET Manual v2.0
If you dial the studio using a cell-phone data network at the remote site you will not normally
experience any firewall or port blocking issues at the remote end of the link using default Tieline
ports.
Troubleshooting: How to Determine Where Firewall Port Blocking is
Occurring
If you find you are unable to either send or receive audio between the studio and remote codecs you
can use Tieline's Link Quality reading to diagnose where ports are being blocked. LQ can be
displayed on the front LCD SCREEN of Tieline's Bridge-IT, Merlin and Genie codecs by selecting
Cxns, then select the connection you want to view and press the OK button. LQ readings are also
displayed on the home screen of all Commander and i-Mix G3 codecs.
Link Quality (LQ) Readings
Send and Return LQ numbers help you to determine if a problem is occurring at either end of a
connection. For example, on an IP connection the Return LQ reading represents the audio being
downloaded from the network locally (i.e. audio data is being sent by the remote codec).
Conversely, the Send LQ reading represents the audio data being sent by the local codec (i.e.
being downloaded by the remote codec). To ensure a stable connection, try to maintain a
reliable reading of 80 or higher for both the Send and Return LQ reading.
Important Note:
·
The Return link quality reading is the same as the Local (L) setting displayed on a
G3 codec.
·
The Send link quality reading is the same as the Remote (R) setting displayed on a
G3 codec.
Diagnosing Port Blocking via the Studio Codec LQ
If the studio codec Return LQ reading is 01 then incoming audio from the remote codec is being
blocked by a firewall at either point A or B in the following diagram. If the studio codec Send LQ
reading is 01 then outgoing audio from the studio is being blocked by a firewall at either point C
or D in the following diagram.
Diagnosing Port Blocking via the Remote Codec LQ
If you attach your Tieline codec at the remote site to a LAN with access to the internet you can
often dial and connect to the studio without any problem. It is less likely that a firewall will block
outgoing TCP and UDP ports. However, if there is a firewall at the remote site it may block
incoming data packets from the studio.
The principle is the same at the remote codec for diagnosing blocked ports. If the remote codec
Return LQ reading is 01 then incoming audio from the studio codec is being blocked by a
firewall at either point C or D in the preceding diagram. If the remote codec Send LQ reading is
01 then the outgoing audio from the remote codec is being blocked by a firewall at either point A
or B in the preceding diagram.
Troubleshooting TCP Port Blocking
Error messages on the codec screen can help to diagnose TCP port blocking.
© Tieline Pty. Ltd. 2017