HPE FlexNetwork MSR Series User Manual

198
Item Description
Local Training
Threshold in
Percentage
When rate training is carried on between fax terminals, the transmitting terminal
transmits "zero-filled" TCF data (the filling time per packet is 1.5±10% seconds) to the
receiving fax terminal, and the receiving fax terminal decides whether the current rate is
acceptable according to the received TCF data.
When the percentage of all-ones or all-zeros TCF data to the total number of TCP data
is less than the local training threshold, the current rate training succeeds. Otherwise,
the current rate training fails and you must drop the rate for a local training operation
again.
By default, the threshold is 10.
IMPORTANT:
When the local training mode is adopted, use this option to configure the threshold in
percentage. When the point-to-point training mode is adopted, the gateway does not
participate in rate training and the threshold of local training is not applicable.
Signal
Transmission
Mode of Fax
Faculty
In common fax applications, the participating fax terminals negotiate with the standard
faculty (such as V.17 and V.29 rate) by default. It means that they do not send each
other non-standard facilities (NSF) message frames. In some cases such as encrypted
fax, both fax terminals adopt a nonstandard faculty (NSF) to negotiate.
At the start of negotiation, both terminals first exchange NSF message frames, and then
negotiate the subsequent fax faculty for communication. NSF messages are standard
T.30 messages and carry private information.
To use a nonstandard faculty for negotiation, the following conditions must be met:
6. Fax terminals must support nonstandard transmission mode.
7. The transmission mode must be set to a nonstandard mode in the POTS and VoIP
entities for both fax terminals.
By default, a standard faculty mode is adopted for fax faculty transmission.
Transmit Energy
Level of a
Gateway Carrier
Usually, the default transmit energy level of the gateway carrier is acceptable. If the fax
cannot be set up yet on the premise that other configurations are correct, you can try to
adjust the transmit energy level of the gateway carrier (that is, transmit energy level
attenuation). A greater level indicates greater energy. A smaller level indicates greater
attenuation.
By default, the transmit energy level of the gateway carrier is –15 dBm.
ECM Fax
As defined in ITU-T, the ECM is required for a half duplex and fax message
transmission using the half-duplex and half-modulation system of ITU-T V.34 protocol.
Besides, the G3 fax terminals working in full duplex mode are required to support
half-duplex mode, that is, ECM.
The fax machines using ECM can correct errors, provide the automatic repeat request
(ARQ) function, and transmit fax packets in the format of HDLC frames. On the contrary,
the fax machines using non-ECM cannot correct errors and they transmit fax packets in
the format of binary strings.
• Enable—Enable ECM for fax.
• Disable—Disable ECM for fax.
By default, ECM is disabled.
ECM can be adopted only if fax machines on both sides support ECM and the gateways
are configured with ECM.
You must enable ECM mode for the local numbers and call routes corresponding to the
fax sender and receiver in the ECM mode.

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English