Alcatel MainStreet 2902, Manual

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17 — DNIC and 2B1Q modules
2902 MainStreet Technical Practices 17-7
May 2002 90-2906-01
For 56 kb/s transparent channels, when RTS is set for end-to-end operation, the value
of RTS is forced into bit position 8. The far-end DTU maps RTS to its own DCD lead
going to DTE devices. With both DTUs operating in end-to-end signaling, incoming
RTS in bit position 8 is mapped to DCD.
For the 2602, 2702 and 2752 MainStreet DTUs, which support X.21 devices, the
control signal (C) is represented on the display by RTS (if DTE) or DCD (if DCE)
and the indicator signal (I) is represented on the display by DCD (if DTE) or RTS (if
DCE). The other control signals are not used.
Procedure 17-6 To set DNIC or 2B1Q control signals
Selecting ON or OFF for inputs configures them as ASSUMED_ON or ASSUMED_OFF.
Selecting ON or OFF for outputs configures them as FORCED_ON or FORCED_OFF.
where pp is 1 or 9, and c is A or B
17.8 Data structure (asynchronous only)
The data structure of asynchronous transmission has three configurable
characteristics:
•
character length
•
number of stop bits
•
type of parity
OUTPUTS
DTR RI DSR DCD CTS RDL ALB RTS
INPUTS
END_TO_END ON OFF
CONFIG — CIRCUIT — < pp-c >
↵
— FUNCTION — CTRL_LEADS
SK000498
Note —
A character must be 8, 9, 10 or 11 bits. The number of bits
in a character is the sum of the start bit (always 1), character length (5,
6, 7 or 8), stop bits (1 or 2) and parity bit (0 for no parity or 1 for odd,
even, mark or space). For example, if the character length is set to
5 bits and the number of stop bits is set to 1, the parity cannot be set
to no parity. If this rule is broken, the relevant softkeys are not
displayed.