SP505AN Datasheet, PDF (24/30 Pages) Sipex Corporation – Multi-Protocol Serial Transceivers

More Compliancy....
In order for networking equipment to be
connected in the European network or even
offered in Europe, it must be thoroughly tested
to a set of specifications. Serial ports are no
exception to the rule and are tested to ensure
compliancy to their respective ITU specifications.
This is to ensure proper operation to the public
network as the equipment is connected. This is
a requirement in order to obtain the "CE" mark
for European compliance.
In January of 1998, CTR1/CTR2 compliancy
could officially be attained by using another test
option called TBR2. The Technical Basis for
Regulation specification was recently finalized
and approved for use as a test criteria for
certification. Similar to NET1/2, the testing
ensures that the serial port adheres to the ITU-T
V-Recommendations. It specifies the connector
type and the signals required between the DTE
and DCE. However, there are some minor
testing differences.
Paragraph 6.3.1 – V.10 Interface
6.3.1.1 Generator open circuit output voltage
The single-ended generator or driver's output
(point A), for either binary state, shall be less
than or equal to 12.0V when terminated with a
3.9kΩ resistor to ground (point C).
A
450Ω
V_t
C
Figure 40. V.10 Driver Terminated Voltage
6.3.1.3 Generator output rise/fall time
The driver output's transition from one binary
point to another shall be less than or equal to 0.3
of the nominal bit duration (t_b). This is measured
between 10% and 90% of its steady state value
and with a 450Ω resistor load to ground.
6.3.1.4 Generator polarities
The driver's single-ended output A shall be:
a) greater than point C (V_OUT > 0V) when the
signal condition 0 is transmitted for data
circuits, or ON for control circuits; and
b) less than point C (V_OUT < 0V) when the signal
condition 1 is transmitted for data circuits, or
OFF for control circuits.
A
3.9kΩ
V_OC
C
A
450Ω
Oscilloscope
C
Figure 39. V.10 Driver Open Circuit Voltage
6.3.1.2 Generator terminated output voltage
The driver output's magnitude, for either binary
state, shall be greater than or equal to 2.0V when
terminated with a 450Ω resistor to ground.
Figure 41. V.10 Driver Transition Time
SP505/6/7APN/03
SP505, SP506, SP507 Application Note
24
© Copyright 2000 Sipex Corporation