Zephyrs and XStreams:
L2mono128 sessions (both versions): if the far end studio complains of underwatery garbled audio, or no lock indication whatsoever, change your codec mode to anything else, say Layer 3, and then back to L2. This forces a reload of the MPEG code and often clears the transmission path. Unfortunately, a reboot of a zephyr does NOT reload the MPEG code and will not clear this issue.
Layer 3 sessions (both versions): If your LOCK light (black units) or 1 & 2 lights over the receive meters (silver units) are flashing upon connection of the second call, double check the sample rate on both ends is matched. EDnet recommend Layer 3 discrete stereo (not joint) and a sample rate of 32kHz for time-code lock to picture work. Similarly, if you hear pitch-shifted audio, yet have a solid lock light, this is also indicative of a sample rate mismatch. Confirm both ISDN boxes are set to the same sample rate.
Unit losing settings (black unit) if your zephyr boots up with a transmit of L3 dual, receive of L3 mono and a rate of 56/32 and will not initialize to your ISDN line, chances are the unit has reverted to its factory settings. This can happen if unit resets itself or the user “cold boots” the unit (Help, then *, then #), in which case you’ll need to put in all your initial settings again (Switch type, local numbers and SPIDs).
The same symptoms will occur if the internal backup battery has died. Telos sell replacement batteries at a nominal cost. These are solder-in batteries, so if you’re not comfortable with soldering, this would require sending the unit back to Telos. EDnet sometimes can provide a loaner or rental unit in the interim.
ISDN Modem screen (silver unit) if your XStream shows “ISDN MODEM” at the top of the LCD screen, chances are good you’ve received a telemarketer call on the XStream since you last used it. To get back to ISDN mode, change the Interface parameter in the TEL menu to “ISDN”. If this is a recurring issue for you, you can set the XStream to answer only ISDN calls. This parameter is also located in the TEL menu, and is called “auto ans”. If you use the XStream as a POTS coupler for plain old telephone calls, you’ll need to manually answer POTS calls.
Failure to lock (both versions), when all codec settings match. Both versions of the zephyr have a known issue where if the far end user is set to transmit audio from the AES/EBU input, but is not presenting signal to the AES/EBU input, the near end will not lock.
Do not set receive to AUTO (silver unit): The AUTO receive setting for the XStream can take up to 45 seconds to lock. Due to this EDnet recommend not using this setting.