Low-Speed Input Characteristics; Input Signaling Characteristics (Pin 3); Low-Speed Output Characteristics; Output Drive Characteristics (Pin 2) - DirecTV DTV-MD0-0058 Information For The Installer

DIRECTV Set-top box information for the installer

3.7 Low-Speed Input Characteristics

3.7.1 Input Signaling Characteristics (Pin 3)

The low-speed data port will comply with the input signaling characteristics shown in Table 5.
Space voltage
Mark voltage
Terminating impedance
Resistance
Capacitance

3.8 Low-Speed Output Characteristics

3.8.1 Output Drive Characteristics (Pin 2)

The STB output drive characteristics are as shown in Table 6.
Space voltage
Mark voltage
Terminating impedance
Resistance
Capacitance

3.8.2 Passive Outputs (Pins 1, 6, 8, and 9) (Optional)

If the data port optional pins one (1), six (6), eight (8) and nine (9) are provided, the passive
outputs will be as shown in Table 7.
DIRECTV Proprietary
Version 1.1.a

Table 5: Input Drive Characteristics

Parameter
+3.0 volts min, +25 volts max
-25 volts min, -3.0 volts max
6K < R < 7K resistive to ground
C < 150 pf

Table 6: Output Drive Characteristics

Parameter
+5.3 volts max at Ioh = 0 mA, +3.0
volts min
-6.0 volts min at Iol = 0 mA, -3.0 volts
max,
3k < R < 7k resistive to ground
C < 2500 pF
Page 11 of 49
Specification
Specification
November 17, 2005
DTV-MD-0058