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D. DIRECT CALL.
This parameter defines if the call set-up must be performed via a hot line relation
(leased line) or via the entry of dial information by the user.
• If this option is set to YES, the hot line relation is used. The data port sends a call set-
up request towards the ISPBX as soon as the X.21 data terminal becomes active or
the terminal user presses the key on the LAM 309 (depending on the `V.24'-
parameter Auto Clear).
In the ISPBX a hot line must be defined between the originating DNR (LAM 309 data
port) and the destination DNR. When the ISPBX receives the call set-up message the
hot line facility is activated and the connection is established.
To release the hot line connection the data port sends a clear message. This message
will be sent when the X.21 data terminal switches inactive or when the terminal user
presses the key on the LAM 309 (depending on the `V.24'-parameter Auto Clear).
• If this option is set to NO, the data port waits for further dial information before it
sends a call set-up request. The ISPBX uses the dial information for determining the
call establishment between an originating DNR and a destination DNR. The
destination number may be stored in the LAM 309 (see chapter Internal Data
Communication).
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E. BYTE ORIENTED PROTOCOL.
This parameter defines if the transfer of information between the data terminal and
the data port is byte or bit oriented.
• If this parameter is set to 0, the protocol is bit oriented. In this case the value for
parameter 6 (wordlength) is not important. The subsequent bits do not represent a
byte. The bits are just placed one after the other and this way the digital information
is transferred to the destination party.
• If this parameter is set to 1, the protocol is byte oriented. The number of bits in a
byte is determined in the next parameter (wordlength).
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F. WORD LENGTH (5, 6, 7 or 8 bits).
This parameter defines the length of the actual data word.
Set this parameter to 7.
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G. PARITY (no, even or odd parity).
This parameter defines if a parity bit is sent after the data word.
Set this parameter to 2, (odd parity)
• Guard 1 + Guard 2
This parameter consists of exactly 6 digits, MMMSSS, and can be divided into two parts:
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MMM for GUARD 1, the dataguarding time in minutes, (000...255).
If there is no activity on both the receive and transmit lines for a certain time period,
the call is cleared autonomously by the data port of the LAM 309. The applicable time
period is defined here.
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