Patton electronic 2720/I Series User Manual download pdf (Page 6)

Switch S2-6 and S2-7: Clock Mode

Set Switch S2-6 and S2-7 to determine the 2720’s transmitter tim-

ing.

S2-6 S2-7 Clock Mode

Off Off

Network Clock

. Transmitter timing is

derived from the received line signal.

On Off

Internal Clock

. Transmitter clock is

derived from an internal oscillator.

NOTE 1: When using the Model 2720 as a high-speed short

range modem, one unit of the link must be configured in Internal

Clock mode, and the opposite end unit must be configured for

Network Clock mode.

If the ERR LED on the front of the unit is flashing (or on) it could

be an indication of a clocking problem. Double check your clock

mode settings and Tx Clock Invert S1-3 settings.

Switch S2-8 Reserved

Line Framing Options:

D4/Superframe

: The D4 framing format, as specified in AT&T

TR62411 is the standard in which twelve frames make up a

superframe. All signaling and synchronization are done in-

band.

Extended Superframe (ESF): Extended Superframe, as speci-

fied in AT&T TR 54016, consists of twenty-four (24) T1

frames. The framing bits are now used for framing, CRC and

the Facility Data Link (FDL). The FDL allows maintenance

messages and information to be passed between the 2720

and the Central Office.

Line Coding Options:

Alternate Mark Inversion (AMI)

: This mode does not inherently

account for ones density. To meet this requirement, each time

slot can be reduced to 56 kbps and the Least Significant Bit

(LSB) of each time slot set to one.

Bipolar 8 Zero Substitution (B8ZS): This mode assures proper

bit density in the data stream. In this mode any data pattern

can be transmitted without causing ones density errors. This

mode allows for 64 kbps clear channel timeslots.

Switch S2-5: DS0 Channel Rate

Use Switch S2-5 to set the DS0 rate.

SW2-5

Setting

Off 56 kbps

On 64 kbps

1 2 3 4 5 6 7 8 9 10 11 ... 22 23

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Patton electronic 2720/I Series User Manual Page 6

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