Patton electronic 1088/K - Manual (Page 9)

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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.
Note 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 coding. The line coding must be the same line cod-
ing prescribed by the NAP (Network Access Provider). Most applications
will use HDB3
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 viola-
tions 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.
MDSL Modem
Clock Mode
MDSL Modem
Unit Designation
1088/K setting
required
External External CP
Internal Internal CP
Receive
Recover
Receive Recover CO
SW4 Line Framing & Coding
Off HDB3
On AMI