Specifications

Excalibur Multirate DAP Installation and Operation
5-18
Table 5-4. Worst Case RTS-CTS Delay Related to Out of Band
RTS-DCD Simulation
DDS Channel
Rate
Worst Case
RTS-CTS Delay
64 Kbps 10 ms
56 Kbps 17 ms
19.2 Kbps 10 ms
9.6 Kbps 10 ms
Notes: The RTS-CTS delay added by RTS-DCD Simulation is in addition to the RTS-
CTS delay selected by the Port CTS Delay parameter described on page 5-13.
Out of band RTS-DCD Simulation can be used when the port is configured for
synchronous or asynchronous operation.
Protocol
The Protocol parameter specifies whether the port operates in synchronous or
asynchronous mode. The correct setting depends on the type of DTE connected to the
port. When asynchronous mode is selected, the submenu parameters are:
• Asynchronous Data Bits (AsDaB) - This parameter specifies the asynchronous
character length used. The character length, which includes one start bit and one
stop bit, can range from 8 to 11. The correct setting depends on the DTE
connected to the DAP.
• Asynchronous Mode (AsMod) - This parameter specifies the asynchronous mode
of operation. When Normal mode is selected, the Excalibur Multirate DAP can
compensate for a DSU/DTE rate differential of +1%, -2.5%. In Extended mode,
the maximum rate differential allowed is +2.3%, -2.5%. Normal mode, which
provides lower distortion, is recommended for most applications.
Interface
This parameter specifies whether the RS-232-E or V.35 interface is used. When the V.35
interface is used, the corresponding adapter must be connected to the DTE connector
located on the rear panel. For models equipped with the 15P09AA or Model D
Aggregate card, the 12-position shunt jumper must be installed on the p.c. board in
location X5 for RS-232-E or X4 for V.35.