Configuration DIP Switch Set “S2”
The only setting for S2 is for Clocking Mode between the Compact
mDSL Modems. All other switches are reserved for factory usage and
must remain in the default configuration. Default settings are shown in
the table below.
Switch S2-1, S2-2, S2-3, S2-4, S2-5 and S2-8:
Switches S2-1, S2-2, S2-3, S2-4, S2-5 and S2-8 are reserved for fac-
tory use and must remain in the factory default settings as shown in
the table above.
Switches S2-6 and S2-7: Clock Mode
Use Switches S2-6 and S2-7 to configure internal, or receive
recover (clocking derived from the remote Compact mDSL Modem
across the DSL span) settings. One Compact mDSL Modem (typically
the CO, or “Central Office” unit) will be set for Internal Clock. The
remote Compact mDSL Modem (typically the CP, or Customer
Premises unit) will be set for Receive Recover clocking. See table
below.
9
Compact mDSL Modem
10
Compact mDSL Modem
Configuration DIP Switch Set “S3”
Use the DIP Switches in Switch S3 to set the DTE Rate (for LAN
Bandwidth Allocation), the transmit data sampling point and to reset
the unit to its software default settings. The following table summa-
rizes default positions of DIP Switch S3. Detailed descriptions of each
switch follow the table.
Switch S3-1 through S3-6: DTE Rate
Use Switch S3-1 through S3-6 to provision bandwidth to the LAN
in 64kbps increments up to 2.304Mbps. Peak bandwidth utilization on
the local domain on an Ethernet LAN runs typically between 15% to
20% (1.5Mbps to 2Mbps) of the maximum bit rate of 10Mbps. Traffic
between LANs typically runs even lower -- between 2% to 7%
(200kbps to 700kbps) of the maximum bit rate depending upon appli-
cation and environmental conditions. This is the amount of traffic that
will run across the DSL span.
Set Switches 3-1 through S3-6 to allocate bandwidth based upon
expected LAN to LAN traffic rates. As an example, set applications
with low LAN to LAN bandwidth content between 64kbps and 576kbps.
Applications with high bandwidth LAN to LAN content should be set
between 576kbps and 2.304Mbps as required.
S3-1
S3-2
S3-3
S3-4 S3-5 S3-6
DTE Rate (kbps)
Off
Off
On
On
On
On
64
On
On
Off
On
On
On
128
Off
On
Off
On
On
On
192
On
Off
Off
On
On
On
256
Off
Off
Off
On
On
On
320
On
On
On
Off
On
On
384
Off
On
On
Off
On
On
448
On
Off
On
Off
On
On
512
CO/CP
Unit
S2-6
S2-7
Clock Mode
Description
Compact mDSL Modem
generates internal,
CO
On
On
Internal
crystal controlled timing.
Compact mDSL Modem
CP
On
Off
Receive Recover
receives its timing
from the CO unit
over the DSL span.
Position
Function
S2-1
Reserved
S2-2
Reserved
S2-3
Reserved
S2-4
Reserved
S2-5
Reserved
S2-6
Clock Mode
On
S2-7
Clock Mode
Off
S2-8
Reserved
Off
Off
Off
S2 SUMMARY TABLE
Factory Default
Off
Off
Off
Receive
Recover
S3 SUMMARY TABLE
Position
Function
Factory Default
S3-1
DTE Rate
On
S3-2
DTE Rate
Off
S3-3
DTE Rate
Off
S3-4
DTE Rate
Off
S3-5
DTE Rate
On
S3-6
DTE Rate
On
S3-7
Reset Software Defaults
On
Normal Operation
S3-8
Reserved
On
}
768 kbps
