Common questions

Can a Cisco gateway change the ECM setting?

Can a Cisco gateway change the ECM setting?

Cisco gateways that use passthrough as their fax transport method cannot alter the ECM setting as it is negotiated between the fax endpoints in the DISC/DCS negotiation. This is because with passthrough the gateways do not demodulate the T.30 messages, rather they are passed through transparently in a G.711 codec across the IP network.

How to disable the ECM on a fax call?

If you need for ECM to be disabled for a fax call (regardless of the ECM setting decided by the fax endpoints) on Cisco IOS voice gateways, you can use the Cisco IOS fax-relay ecm disable configuration command under the VoIP dial peer or, in the case of MGCP, use the no mgcp fax t38 ecm command.

What are the advantages and disadvantages of ECM?

The main advantage of ECM is that it guarantees error-free faxes. The principal disadvantage for ECM is that its persistent error correcting behavior can cause faxes to fail or take a long time to successfully deliver a fax when line quality is poor or conditions where there are lots of errors.

When is a PPS-EOP message sent in ECM?

A PPS-EOP is sent when the last block of the last page is transmitted to indicate there is no more page data to be sent. The reception of all three PPS messages above are acknowledged by a Message Confirmation (MCF). Since the whole point of ECM is to detect and correct any page errors, it has a T.30 message to signal this.

What happens if your ECM is not working?

A faulty ECM disallows your engine from knowing how much fuel to burn in the combustion process. Typically, the vehicle consumes more fuel than it should in this situation. You’ll end up paying more for gas than you would with a functioning ECM. The ECM plays a vital role in engine performance.

Can a bad ECM cause a car to stall?

Engine Stalling or Misfiring Erratic engine behavior may also indicate a bad or failing ECM. A faulty computer may cause the vehicle to intermittently stall or misfire. The symptoms might come and go and not appear to have any sort of pattern to their frequency or severity. 3. Engine Performance Issues

How does the engine control module ( ECM ) work?

The ECM takes the information from the engine’s various sensors, and uses that information to calculate and tune engine spark and fuel for maximum power and efficiency. The ECM plays a crucial role in newer vehicles, where many (if not all) of the essential functions of the car are controlled by the ECM.

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Ruth Doyle