PANASONIC AVIONICS CORPORATION
Enhanced Cell Modem
ASC-AA8190-01
PROPRIETARY AND CONFIDENTIAL
PAGE 17 OF 22
5.4 Discrete Inputs and Outputs Characteristics
5.4.1 5V Discrete Input
The eCM provides one maintenance Enable discrete input to allow the unit entering test mode.
The discrete input has the following requirements:
Ground
=
Logic Low
– Enable maintenance mode
=
< 100
or < 1.5V with sink current 1mA maximum
Open
=
Logic High
– Disable maintenance mode
=
> 100 K
or > 2V
5.4.2 28V Discrete Input
The eCM provides five 28V aircraft discrete inputs and three spares. The 28V discrete input conforms to
Boeing D6-36440, paragraph 3.6.2 and Airbus ABD100.1.9, paragraph 3.2.
1) The eCM provides one Modem Enable 1 discrete input and the logic state conforms to ARINC 628,
Part 1, paragraph 17.2:
Ground =
Turn on the cell modem and Wi-Fi cards power.
=
< 100
or < 3.5V with sink current between 2mA minimum and 5.36mA maximum.
Open
=
Turn off the cell modem and Wi-Fi cards power.
=
> 100 K
or within 14.5V to 36V
2) The eCM provides two Modem Enable 2a (Active Low ) and Modem Enable 2b (Active High) discrete
inputs. Depending on manufacturers Boeing/Airbus or aircraft types B787, B777, etc.; only one Modem
Enable discrete is connected to the eCM. The discrete inputs have the following requirements:
Modem Enable 2a (Active Low):
Ground =
Aircraft is on the ground. Turn on the cell modem and Wi-Fi cards power.
=
< 100
or < 3.5V with sink current between 2mA minimum and 5.36mA maximum.
Open
=
Aircraft is on the air. Turn off the cell modem and Wi-Fi cards power.
=
> 100 K
or within 14.5V to 36V.
The Modem Enable 2a (Active Low) discrete input is connected to ground when not used or not
connected to aircraft discrete signal.
Modem Enable 2b (Active High):
Ground =
Aircraft is in the air. Turn off the cell modem and Wi-Fi cards power
=
< 100
or < 3.5V with sink current between 2mA minimum and 5.36mA maximum.
Open
=
Aircraft is on the ground. Turn on the cell modem and Wi-Fi cards power.
=
> 100 K
or within 14.5V to 36V.
The Modem Enable 2b (Active High) discrete input is left open when not used or not connected to
aircraft discrete signal.
3)
The eCM provides three spare 28V discrete inputs and have the following requirements:
Ground =
Active.
=
< 100
or < 3.5V with sink current between 2mA minimum and 5.36mA maximum.
Open
=
Inactive.
=
> 100 K
or within 14.5V to 36V.
