Voice Switching Daughtercard — Euro BRI ISDN
Page 2-17
Network or Line Terminator (NT/LT) / Terminal Equipment (TE)
The NT/LT and TE jumpers (
J29
and
J30
) are used to set the type of terminator on the VSB
daughtercards. When the shunts are removed from these jumpers, NT (LT) is set as the termi-
nator type; this is the default setting for both jumpers. When these jumpers and switches are
set to either NT/LT or TE, the
voice port isdn protocol
command must also be set to the same,
corresponding setting. For details on using this command, see Chapter 5, “VoIP Commands.”
♦
Note
♦
J29
and
J30
must match settings on
NT (LT)/TE
(Cross-Over toggle switches. The default setting for the
toggle and corresponding jumpers is
NT
(see illustra-
tion for
VSB Jumpers
on page 2-16.)
Default (
J29
):
NT (LT)
on port 1;
no shunts
on
pins 1_2
.
Default (
J29
):
NT (LT)
on port 2;
no shunts
on
pins 3_4
.
Default (
J30
):
NT (LT)
on port 3;
no shunts
on
pins 1_2
.
Default (
J30
):
NT (LT)
on port 4;
no shunts
on
pins 3_4
.
TE
(J29): TE on port 1;
requires shunts
on pins 1_2.
TE
(J29): TE on port 2;
requires shunts
on pins 3_4.
TE
(J30): TE on port 3;
requires shunts
on pins 1_2.
TE
(J30): TE on port 4;
requires shunts
on pins 3_4.
For VSB jumpers
J29
and
J30
, only the following five NT (LT)/TE port configurations are
allowed:
• All four ports can be configured as TE (ports are TE, TE, TE, TE).
• All four ports can be configured as NT (Ports are NT, NT, NT, NT).
• Ports 1, 2, and 3 configured as TE and port 4 configured as NT (ports are TE, TE, TE, NT).
• Ports 1 and 3 configured as TE, and port 2 and 4 configured as NT (ports are TE, NT, TE,
NT).
• Port 1 configured as TE, and port 2, 3, and 4 configured as NT (ports are TE, NT, NT, NT).
Impedance
The impedance jumpers (
J16
,
J18
,
J20
,
and
J22
) are used to set the resistance to the alternat-
ing current on the VSB daughtercards. When the shunts are removed from these jumpers, the
standard impedance of 100 Ohms
will not
be fed to the designated port; this is the default
setting for all four jumpers.
Default (
J16
):
no impedance
on port 1; no shunts on
pins 1_2
and
pins 3_4
.
Default (
J18
):
no impedance
on port 2; no shunts on
pins 1_2
and
pins 3_4
.
Default (
J20
):
no impedance
on port 3; no shunts on
pins 1_2
and
pins 3_4
.
Default (
J22
):
no impedance
on port 4; no shunts on
pins 1_2
and
pins 3_4
.
(J16):
add impedance
on port 1;
requires shunts
on
pins 1_2
and
pins 3_4
.
(J18):
add impedance
on port 2;
requires shunts
on
pins 1_2
and
pins 3_4
.
(J20):
add impedance
on port 3;
requires shunts
on
pins 1_2
and
pins 3_4
.
(J22):
add impedance
on port 4;
requires shunts
on
pins 1_2
and
pins 3_4
.
Summary of Contents for 060170-10
Page 1: ...Part No 060170 10 Rev C April 2004 VoIP User Manual Release 4 5...
Page 4: ...page iv...
Page 14: ...Table of Contents page xiv...
Page 34: ...VoIP and VLANs Page 1 20...
Page 64: ...VoIP Daughtercard Port Numbering Schemes Page 2 30...
Page 424: ...VoIP Commands Page 5 282...
Page 430: ...Page I 6 Index...