Studio Technologies M380, Руководство пользователя

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Model 380 User Guide Issue 1, September 2016
Studio Technologies, Inc. Page 17
be sent to only the left headphone output
channel.
The level of sidetone audio being sent to
either the left and right headphone output
channels or only the left headphone out-
put channel is adjusted using the rotary
level control (“pot”) that is located on the
top of the Model 380’s enclosure. Typically
providing a precise sidetone level is not
important and most users will not be con-
cerned about setting it to a specific value.
But setting the sidetone level to something
reasonable is important. Setting the level
too low will encourage a user to speak
too loudly; setting it too high and the user
will be tempted to speak hesitantly. Audio
does not pass directly through the sidetone
pot. The pot’s position is monitored by the
Model 380’s processor which then controls
the level within the digital audio domain.
Technical Notes
IP Address Assignment
By default the Model 380’s Ethernet inter-
face will attempt to automatically obtain an
IP address and associated settings using
DHCP (Dynamic Host Configuration Proto-
col). If a DHCP server is not detected an IP
address will automatically be assigned us-
ing the link-local protocol. This protocol is
known in the Microsoft® world as Automat-
ic Private IP Addressing (APIPA). It is also
sometimes referred to as auto-IP (PIPPA).
Link-local will randomly assign a unique
IP address in the IPv4 range of 169.254.0.1
to 169.254.255.254. In this way multiple
Dante-enabled devices can be connected
together and automatically function, wheth-
er or not a DHCP server is active on the
LAN. Even two Dante-enabled devices that
are directly inter-connected using an RJ45
patch cord will, in most cases, correctly
acquire IP addresses and be able to com-
municate with each other.
An exception does arise when trying to
directly interconnect two Dante-enabled
devices that use Ultimo integrated circuits
to implement Dante. The Model 380 uses
the Ultimo “chip” and, as such, a direct
one-to-one interconnection to another
Ultimo-based product is not supported.
An Ethernet switch linking the two units is
required to successfully interconnect two
Ultimo-based devices. The technical rea-
son that a switch is required relates to the
need for a slight latency (delay) in the data
flow; an Ethernet switch will provide this.
Using the Dante Controller software ap-
plication the Model 380’s IP address and
related network parameters can be set for
a fixed (static) configuration. While this is a
more involved process than simply letting
DHCP or link-local “do their thing,” if fixed
addressing is necessary then this capabil-
ity is available. But in this case it’s highly
recommended that every unit be physically
marked, e.g., directly using a permanent
marker or “console tape,” with its specific
static IP address. If knowledge of a Model
380’s IP address has been misplaced there
is no reset button or other method to easily
restore the unit to a default IP setting.
In the unfortunate event that a device’s IP
address is “lost,” the Address Resolution
Protocol (ARP) networking command can
be used to “probe” devices on a network
for this information. For example, in Win-
dows OS the arp –a command can be
used to display a list of LAN information
that includes MAC addresses and cor-
responding IP addresses. The simplest
means of identifying an unknown IP ad-
dress is to create a “mini” LAN with a small