7
CO/CP and Using the 1088/K with other Patton mDSL modems
Other Patton mDSL modems allow the option of specifying the
clock mode, but not the CO/CP designation. This is already done inter-
nally within the unit. When connecting a 1088/K to an mDSL modem
(e.g. Model 1088/C, 1088/D or 1095) other then a Model 1088/K,
determine the source of the system clock and then determine the
Model 1088/Ks CO/CP designation based upon the following chart.
*Reminder: In each DSL modem pairing, one unit must act as the CO unit, the other must
act as the CP unit.
Switch S1-2: Line Coding
Use Switch S1-2 to configure the G.703/G.704 network line cod-
ing. The line coding must be the same line coding prescribed by the
NAP (Network Access Provider). Most applications will use HDB3
SW4
Line Framing & Coding
Off
HDB3
On
AMI
Line Coding Options:
High Density Bipolar 3 (HDB3): In HDB3 coding, the transmitter
deliberately inserts a bipolar violation when excessive zeros in the
data stream are detected. The receiver recognizes these special
violations and decodes them as zeros. This method enables the
network to meet minimum pulse density requirements. Use HDB3
unless AMI is required in your application .
Alternate Mark Inversion (AMI): AMI coding does not inherently
account for ones density. To meet this requirement, you should
ensure that the data inherently meets pulse density requirements.
Switch S1-3: CRC-4 Multiframe
CRC-4 Multiframe uses Time Slot zero to carry CRC-4 informa-
tion. When CRC-4 is enabled (ON), the unit synchronizes to the CRC-
4 multi-frame protocol.
S1-3
Option
Off
Disabled
On
Enabled
NOTE: When the DTE rate is set to 2048 Kbps, Model 1088/K
transmits user data on all 32 timeslots, ignoring framing informa-
tion. In this case, Switch S1-3 will need to be in the disabled (Off)
position.
Switches S1-4, S1-5, S1-6, S1-7 and S1-8: Reserved
Switches S1-4, S1-5, S1-6, S1-7, S1-8 are reserved for factory
usage and must remain in the default configuration,
except when using
the Netlink Plug-and-Play feature.
S1-4
S1-5
S1-6
S1-7
S1-8
Default Setting
Off
On
Off
On
Off
Only Valid Setting
8
MDSL Modem Clock
Mode
MDSL Modem Unit
Designation
1088/K setting required
External
CO
CP
Internal
CO
CP
Receive Recover
CP
CO
109X
109X
