Yealink VCM38 Administrator's Guide

| Configuring Network Settings | 81
Parameter DHCP Options Description
Subnet Mask 1 Specify the subnet mask of the
client.
Time Offset 2 Specify the offset between the
client subnet and the Coordinated
Universal Time (UTC).
Router 3 Specify a list of IP addresses for
routers on the client’s subnet.
Time Server 4 Specify a list of time servers
available to the client.
Domain Name Server 6 Specify a list of domain name
servers available to the client.
Host Name 12 Specify the name of the client.
Domain Server 15 Specify the domain name that
client should use when resolving
hostnames via DNS.
Network Time Protocol Servers 42 Specify the list of NTP server
address available to the client.
Vendor-Specific Information 43
Identify the vendor-specific
information.
Vendor Class Identifier 60
Identify the vendor type.
TFTP Server Name 66 Identify a TFTP server when the
'sname' field in the DHCP header
has been used for DHCP options.
DHCP Option 42, Option 2
Your system can obtain the NTP server address via DHCP.
DHCP option 42 is used to obtain the available NTP server list.
DHCP option 2 is used to specify the offset (seconds) between the system’s subnet and Coordinated
Universal Time (UTC).
Related tasks
Configuring NTP Server
DHCP Option 12
You can specify a hostname for the system. When the system sends the request of DHCP DISCOVER, it
will report the configured host name to the DHCP server via DHCP option 12. See RFC 1035 for character
restrictions.
• Configuring the Host Name

Yealink VCM38 Specifications

General

Type	Conference microphone
Noise reduction	Yes
Microphone frequency	100 - 16000 Hz
Microphone sensitivity	-45 dB
Microphone pick-up range	6 m
Number of microphone arrays	8
Maximum sound pressure level (1kHz)	100 dB
Device interface	RJ-45
Connectivity technology	Wired
Maximum operating distance	40 m
Mounting type	Ceiling
Product color	Silver
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 90 %
Number of products included	1 pc(s)
Harmonized System (HS) code	85181000
Power source	DC/PoE
Sustainability certificates	CE, Federal Communications Commission (FCC), REACH, RoHS

Weight and Dimensions

Width	127.3 mm
Height	66.3 mm