Excalibur 366 Specifiche Pagina 27

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Introduction
1-11
The extended range feature can be enabled from the front panel for all DTE rates
when the service is set for LADC or LDM. For all other services, it can be
enabled when the DTE rate is 19.2 Kbps or greater. Extended range operation is
automatic for units equipped with the Model D or 15P09AA-1 Aggregate card.
Options
The Excalibur Multirate DAP provides several options to meet your specific network
requirements. The options are described in the following sections.
Dual Interface
The dual interface option provides a V.35 interface connection in addition to the standard
RS-232-E connection. Simply select the V.35 option from the front panel, change a
jumper setting on the printed circuit card, and connect to the V.35 adapter instead of the
RS-232-E connector.
Integral Dial Backup
You can select from the following Integral Dial Backup (IDBU) options:
2-wire Analog IDBU
4-wire Switched 56 Kbps IDBU
2-wire Integrated Services Digital Network (ISDN) IDBU
An IDBU option allows you to decrease your network's down time with dial backup in
the event the network or digital lines go down. (See Figure 1-4.) The dial backup
telephone line connection can be established automatically, manually, or in response to
CMS network management system commands. When set for automatic operation, the
DAP automatically initiates dial backup calls in response to user-selectable criteria (such
as loss of signal on the digital line). With manual operation, dial backup calls can be
initiated by pressing the proper buttons on the DAP's front panel. In networks equipped
with a CMS network management system, dial backup calls can be initiated from the
CMS console.
Analog IDBU can operate in either Programmable or Permissive Mode. In
Programmable Mode, a limiting resistor in the telephone company's data jack programs
the DAP so that the signal level received at the central office does not exceed -12 dBm.
In Permissive Mode, the DAP's transmit level is fixed internally at -9 dBm. Both modes
support tone and pulse dialing.
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