NEC SV8500, Руководство пользователя

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VOL.2-758
MG-BRI
[3]
Emergency Telephone Switching Test
The general description of the “Emergency Telephone” is explained below.
Note:
Telephone terminal to be connected to EMA TEL will be ISDN terminal or Terminal A Analog Tele-
phone. The line connected directly to the ISDN line using this feature will be LINE 0 only.
Connect the ISDN line on the LINE 0 side and ISDN telephone (or TA + Analog Telephone) on the
EMA TEL side. About the cable length, locate the ISDN terminal (or TA) below 1000 meters (3280
feet) from the DSU.
• Test of MG-BRI before completing the initialization
STEP 1
Turn OFF the power of MG-BRI by pulling out the AC code of AC Adapter.
STEP 2
See if the ISDN terminal (or TA + Analog Telephone) can be connected directly and originate/termi-
nate a call to/from ISDN network.
• Test of case when WAN is faulty
STEP 1
Turn ON the power of MG-BRI by plugging in the AC code of AC Adapter, then confirm the status is
in “ON LINE” after initialization.
STEP 2
Pull out the connector from the LAN and wait until MG-BRI detects the WAN fault. (About 4 minutes)
STEP 3
See if the ISDN terminal (or TA + Analog Telephone) can be connected directly and originate/termi-
nate a call to/from ISDN network.
Note:
“Emergency Telephone” will be effective until the MG-BRI status changes to “ON LINE” when turning
ON the power of MG-BRI and while in initializing status.
Line I/F Unit
Call Path Control Unit
LAN I/F Unit
LAN
LINE0
LINE1
EMA TEL
TA
DSU
DSU
ISDN LINE
ISDN LINE
Analog Telephone
TA: Terminal Adapter
DSU: Digital Service Unit