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DCP Operation
3-353910-A2-GN32-30 November 1996
Service Line/Disconnect Service Line
The Service Line function allows you to switch a specific Model 391
1 installed in a COMSPHERE
3000 Series Carrier from normal leased or dial operation to service-line operation. This switch
only places the modem on the service line. For a connection to be established, you must still use
the normal dialing methods as described earlier in this chapter in the
Call Setup Branch
section.
A service line is an extra dial line connected to a COMSPHERE 3000 Series Carrier
. This line is
normally shared by up to eight Model 3911 modems installed in either Slots 1–8 or Slots 9–16.
However, by daisy chaining the service-line connector of one Network Interface Module (NIM) to
the service line of another NIM installed in the same carrier, you can permit all 16 modems to
share one service line. The service line can also be extended to other carriers in a cabinet. For more
information regarding daisy chaining of modems to the service line, refer to the COMSPHERE
3000 Series Carrier
, Installation Manual.
A service line is ideal for a dial backup of Model 391
1 modems operating on leased lines.
Remember that a service line can back up only one failed leased line at a time.
To enable Service Line from the Control branch, make the following selections:
F1
Control:
Service_Line
F2
F3
Press the
key until Service_Line appears. Select Service_Line to switch the modem from its
normal dial line to the service line. Now
, when the modem places a call, instead of using the dial
line, the call is placed on the service line.
To disconnect the modem from the service line and resume normal operation, press the
key
once and the
key until DiscServiceLine appears.
Select DiscServiceLine. The call and service line disconnect and the message
Command
Complete
appears on the LCD.
Download Software
The Download Software function sets parameters within the modem when transferring firmware to
one or more modems or when receiving firmware upgrades from a locally attached PC-based
controller. The latter is only performed by customer service personnel.
There are two selections under Download Software: Clone Remote and To Local via DTE. Clone
Remote is used to transfer an exact copy of the firmware currently stored in a 391x Series modem
to either one or more remote 391x Series modems or one or more DC-attached 391x Series
modems. Remote modems must be connected to the local modem via a leased-line network or an
established dial-line network. If these prerequisites do not exist, Clone Remote will not appear on
the LCD.
The second selection appearing on the LCD is T
o Local via DTE. This function permits firmware
upgrades to be transferred to a 391x Series modem. This type of download requires a locally
attached PC controller to be connected to the modem’
s DTE port as well as special download
software. Any downloads using this selection are intended to be performed by customer
service personnel only
.