During Use - Hitachi EM-G21 User Manual

7.2 During Use

For troubles during use, try actions according to the table below. If the error persists,
check if the latest firmware version is applied and, if not, perform firmware upgrade
according to Chapter 6.
Symptom
Wired LAN connection encounters
slowdown of link speed or
communication failure.
Wireless LAN connection encounters
communication failure.
LAN terminals cannot communicate
with one another.
Firmware upgrade fails.
The ALARM lamp in the front access
area of the Gateway is lit in red.
Suspected Cause and Action To Be Taken
When the user prepares a LAN cable, procure a
LAN cable of category 5e or higher if 1 Gbps
(1000 Mbps) link speed for 1000BASE-T is
desired. Otherwise, slowdown of link speed or
communication failure may result.
 Open the "EMS Gateway" setup page, select
Wireless Configuration from Wireless menu,
and check if a proper channel of the wireless
LAN terminal (user PC) is specified. When the
autoselect channel setting fails to establish a
wireless connection, change the setting to a
specific channel verified on the user PC.
 Check if encryption method parameters and
Security Encryption Key values match between
the Gateway and the user PC. In particular
when WEP is in use, ensure that the values of
WEP Key Index and WEP Keys #1 to #4 match
between the Gateway and the user PC.
 When MAC address filtering is in use, ensure
that the MAC address of the user PC is
registered to the Gateway according to the
procedure of Section 5.2.
 Wireless LAN connection may fail when the
encryption setting of an IEEE 802.11n-based
user PC is "WPA-PSK (TKIP)" or "WPA2-PSK
(TKIP)." To ensure communications with an
IEEE 802.11n-based user PC, change the
encryption setting to "WPA-PSK (AES)" or
"WPA2-PSK (AES)," where the latter is
recommended. As an alternative, if
applicable, change the operation mode of the
user PC to IEEE 802.11g or IEEE 802.11b.
LAN terminals may not support communications
based on domain names. Try not to use domain
names.
Operation of manual firmware upgrade is not
available during upgrading of the firmware, during
task scheduling for automatic firmware upgrade,
during restarting of the Gateway, or during any
setting/maintenance operation.
The Gateway is in error. Restart the Gateway by
unplugging and plugging the power cord with an
interval of 10 seconds or longer between
unplugging and plugging.
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