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M5317 BRI Terminal Page 347 of 544
Option 11C and 11C Mini Technical Reference Guide
Servicing
Except for the insertion or removal of the data and headset option circuit
board, as noted above, it is not necessary to open the telephone case for field
servicing purposes. The telephone line cord and the handset cord are both
equipped with TELADAPT connectors at both ends, permitting quick
replacement where required. A hatch is provided for access to the dip
switches to permit the selection of the appropriate power supply and of the
“designated” telephone status.
Telephone programming
Service Profile Management
In NI-1 mode, information related to the programmable keys may be loaded
into the M5317T memory from the Integrated Services Digital Line Card
(ISDC) at the switch. This feature loading process will be performed on
request. Currently, only DMS central offices support this service.
Accessibility of features depends on subscription at the switch, and softkeys
for features not subscribed are removed from the display. Not all features
need be provided in every case. Service change routines permit addition or
deletion of features. If no feature loading takes place, the telephone must be
configured manually. Do not confuse this feature loading with the overall
firmware downloading. The information is stored so that it is not lost when
the power is removed.
In MFT mode, there is no equivalent process required because the protocol is
much simpler. There is no such process for Meridian 1 mode because no
optional features are provided.
Downloading
Firmware in the M5317TDX can be replaced by downloading from a server.
This procedure is usually only required to customize the firmware, or to make
additional features available.
BootROM operation
If downloading fails, or if the user selects it, control from the Main firmware
is replaced by a simpler version called the Boot ROM firmware. This allows
basic voice call operation until successful downloading is achieved.