7996 SHDSL NTU User’s Guide
4.3.7 E1
Interface Configuration
When you select
Main Menu>Configuration>E1 Interface Configuration
,
one of the two
different E1 Interface Configuration screens is displayed. In the SHDSL Interface Configuration,
if the field
E1 Transparency
is enabled, then the time slots of the E1 interface will be
unconfigurable. The screen is shown in Figure 4-9. It allows the user to set the field
Line Drive
to
75 ohm
or
120 ohm
, and to enable the field
Local Loopback Send All 1
, but the field Line
Code is not selectable. (It is fixed as HDB3.) A practical SHDSL line rate is shown at the bottom
of the screen.
Figure 4-9 E1 Interface Configuration Screen I
Figure 4-10 shows another E1 interface configuration screen, when
E1 Transparency
is
disabled from the SHDSL interface menu. The time slot becomes configurable. The
Line Drive
and
Local Loopback Send All 1
settings are explained in the previous section. The user can also
select
Line Type
: E1 / E1-CRC and configure the
Time Slot Map
.
In the E1 time slot map, there are 31 user-selectable time slots. The user can enter
1
to enable, or
0
to disable the time slot. After completing the configuration, use the
Up/Down
arrow keys to
highlight the
Confirm
field, and press
Enter
to confirm the settings.
Figure 4-10 E1 Interface Configuration Screen II
7996-A2-GB21-00 September
2004 21