D-Link DI-1750 Reference Manual page 458

the key command that must be configureds are config-port and config-destination-pattern.
The command config-destination-pattern defines the telephone number associated with this
POTS dial peer. The command config-port associate this POTS dial peer with a specific voice port.
Generally this command connects D-Link IP telephone equipments with telephone or local PBX
telephone port.
♦
VoIP—Dial peer describing the characteristics of a packet network connection; in the case of
Voice over IP, this is an IP network. VoIP peers point to specific VoIP devices. To configure VoIP dial
peer, you must configure the key commands config-destination-pattern and set-session. The
command config-destination-pattern defines the destination telephone number associated with
this VoIP dial peer. The command set-session specify a destination IP address for this dial peer.
2. Voice Port
Use the voice port command of D-LinkIP telephone equipments to define the parameter about specified
voice port. D-LinkIP telephone equipments support three voice ports:
♦ FXO---Foreign Exchange Office interface. The FXO interface is an RJ-11 connector that allows a
connection to be directed at the PSTN's central office (or to a standard PBX interface, if the local
telecommunications authority permits). This interface is of value for off-premise extension
applications.
♦ FXS---The Foreign Exchange Station interface. This interface is an RJ-11 connector that allows
connection for basic telephone equipment, keysets, PBXs, and supplies ring, voltage, and dial tone.
♦ E&M---The "Ear and Mouth" interface (or "RecEive and TransMit") interface. This interface is an
RJ-48 connector that allows connection for PBX trunk lines (tie lines).
D-Link IP telephone connector currently provides only analog voice ports. The type of signaling
associated with these analog voice ports depend on the interface module installed into the device. For
example, V100 has two FXS ports, DI-1750 series routers support two-o\ports FXS, FXO and E&M
voice card. DI-3600 series router supports either a two-port or four-port voice network module (VNM) of
FXS, FXO and E&M.
12.1.2 Voice Primer
To understand D-LINK's voice implementations, it helps to have some understanding of analog and
digital transmission and signaling. This section provides some very basic, abbreviated voice telephony
information as background to help you configure Voice over IP, which includes the following topics:
♦ Numbering Scheme
♦ Analog versus Digital
♦ CODECs
♦ Delay
♦ Jitter
♦ Echo
♦ Signaling
1. Numbering Scheme
The standard PSTN is basically a large, circuit-switched network. It uses a specific numbering scheme,
which complies to the ITU-T E.164 recommendations. In D-Link's voice implementations, numbering
schemes are configured using the config-destination-pattern command. For numbering, D-Link
provides the
config-destination-pattern.
2. Analog versus Digital
Until recently, the telephone network was based on an analog infrastructure. Analog transmission is not
particularly robust or efficient at recovering from line noise. Because analog signals degrade over
distance, they need to be periodically amplified; this amplification boosts both the voice signal and
ambient line noise, resulting in degradation of the quality of the transmitted sound.
concrete suggestion,
Model Name
please refer to
- 456 -
the description of command