Parameter 38 - Bay Networks 5399 Release Note

CT: V25 Calling Tone - V25 calling tone. This tone is used in some
international modems to identify a data call from a voice call.
0: Disable
1: Enable

Parameter 38

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3
Value 0 0 0 0 0 0 0 0 0 0 0 0 0
Descr. Unused
Default config_bytes Setting:
Decimal base: 2
Octal base: 02
Hexadecimal base: 0x2
NE: Near End Echo Canceller - Echoes on the modem's phone line are
due to transitions from digital or four-wire connections to two-wire
analog service as found in domestic telephone connections. In most
situations where the modem has a direct digital connection to the
PSTN (T1, E1, or PRI ISDN), the signal is converted to two-wire
analog only once, just before being routed to the subscriber's phone
jack (client modem). In this case, only one echo is generated from the
far end. This far end echo is expected and is compensated for by the
modem's normal far end echo canceller.
In a very few situations, the telco converts the digital connection to
two-wire analog and then back to digital before it is routed to the
distant telco where the expected two-wire conversion is then
performed. This additional conversion results in an unexpected near-
end echo which may be compensated for by enabling this parameter.
Remote Access Software Version 5.3 Release Notes
Reserved
300115-B Rev. A
2 1 0
0 1 0
FP FE NE
27