Fax Or Modem Transmission And Detection; Without Fmoip - Siemens HG 3500 V4 Service Manual

2.2 Fax or Modem Transmission and Detection

A31003-H3150-S104-2-7620, 03/2009
HiPath 4000 V5, IP Solutions - HG 3500 & HG 3575, Service Documentation
IP address
172
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 1 1 1 1 0 0 0 1 0 1 1 0 1
Netmask
255
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0
Subnet
Network address
172
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0
Table 2-1
Figure 1 Example: Class B IP address, netmask and network address

2.2.1 Without FMoIP

The transmission of fax signals (or audio signals from modems) over IP is
generally not without its problems.
• With fax/modem transmission,
• voice compression and
• voice activity detection
must be disabled.
• Fax/modem transmission is very sensitive to packet loss in the IP network.
The effective packet loss rate in the network must be considerably lower for
fax/modem transmission than for voice transmission.
• Fax machines and modems are very sensitive to runtime fluctuations on the
transmission path, which is why there must be no automatic adaptation of the
jitter buffer.
The IPDA components evaluate the pilot tones of the caller fax machine or
modem and then make sure that the connection is optimized for modem
transmission.
Fax or Modem Transmission and Detection
16 222
255 240
1 1 0 1
16 208
gateways_02_terms.fm
Terms
45
0
0
9