Specifications

Ethernet Connection Speed Reference Manual (MGCP/NCS Version)
Mediatrix 4100
59
2. If the DNS server cannot be contacted within two seconds, the Mediatrix 4100 sends a request to
the secondary DNS server.
3. If the secondary DNS server cannot be contacted, the Mediatrix 4100 uses the replacement value
from Table 45
for all variables that depend on the DNS.
Ethernet Connection Speed
You can set the speed of the Ethernet connection of the Mediatrix 4100.
You can also set these parameters via the web interface, as described in “Ethernet Connection Speed” on
page 58.
 To set the Ethernet connection speed:
1. In the sysConfigMIB, set the Ethernet connection speed of the:
• ETH1 connector in the sysConfigNetworkEthernetSpeed variable
• ETH2 connector in the sysConfigComputerEthernetSpeed variable.
The following values are available:
• Auto detect
• 10Mbs-HalfDuplex
• 100Mbs-HalfDuplex
• 10Mbs-FullDuplex
• 100Mbs-FullDuplex
A half-duplex connection refers to a transmission using two separate channels for transmission and
reception, while a full-duplex connection refers to a transmission using the same channel for both
transmission and reception.
If unknown, set the variable to Auto detect so that the Mediatrix 4100 can automatically detect the
network speed.
2. Restart the Mediatrix 4100 so that the changes may take effect.
Speed and Duplex Detection Issues
There are two protocols for detecting the Ethernet link speed:
 An older protocol called parallel detection.
 A more recent protocol called auto-negotiation (IEEE 802.3u).
The auto-negotiation protocol allows to detect the connection speed and duplex mode. It exchanges
capabilities and establishes the most efficient connection. When both endpoints support the auto-negotiation,
there are no problems. However, when only one endpoint supports auto-negotiation, the parallel detection
protocol is used. This protocol can only detect the connection speed; the duplex mode cannot be detected. In
this case, the connection may not be established.
The Mediatrix 4100 has the possibility to force the desired Ethernet link speed and duplex mode by disabling
the auto-negotiation and selecting the proper setting (sysConfigNetworkEthernetSpeed variable). When
forcing a link speed at one end, be sure that the other end (a hub, switch, etc.) has the same configuration. To
avoid any problem, the link speed and duplex mode of the other endpoint must be exactly the same.
Caution: Whenever you force a connection speed / duplex mode, be sure that the other device and all
other intermediary nodes used in the communication between the two devices have the same configuration.
See “Speed and Duplex Detection Issues” on page 59 for more details.