Instructions

Hardware installation
104275_en_c00 PHOENIX CONTACT 2-7
4-wire connection (line redundancy or speed increase)
Figure 2-5 4-wire connection
• For 4-wire connection, connect DSL port A (a and b) of the first modem to DSL port B
(a and b) of the second modem. Connect a and b as desired.
• Connect DSL port A (a and b) of the second modem to DSL port B of the first modem
(a and b).
Figure 2-6 Star-quad twisted cables
Both "LINK" LEDs indicate which stage of connection establishment the modem is in. If the
"LINK" LED is permanently on, the connection has been established.
The two "STAT" LEDs indicate the link quality. The longer the LED lights up, the better the
link quality (see page 2-4).
The 4-wire connection can be used for line-redundant operation or to increase the speed.
In the case of star-quad twisted cables, use the individual wires on the opposite side
(1a/1b or 2a/2b) to avoid crosstalk.
When crosstalk is intensive, the data rate can drop sharply. At worst, no SHDSL connec-
tion is established between the two devices.
In the case of extremely long lines that are susceptible to interference, automatic detec-
tion of the data rate may not be possible.
In this case, specify a fixed data rate via the PSI-CONF configuration software.
Short flashing of the green "LINK" LEDs indicates that the DSL port is not disabled.
PSI-MODEM-SHDSL/SERIAL
Ord.-No. 23 13 669
VCC
DG
RD
TD
ERR
LINK
STAT
LINK
STAT
DSL A
DSL B
SERIAL
TERM
RS232
PSI-MODEM-SHDSL/SERIAL
Ord.-No. 23 13 669
VCC
DG
RD
TD
ERR
LINK
STAT
LINK
STAT
DSL A
DSL B
SERIAL
TERM
RS232
11 2
1a
2a
1b
2b