Patton electronic 2710 - Manual (Page 12)

12
Line Framing Options:
• D4/Superframe: The D4 framing format, as speciÞed in AT&T
TR62411 is the standard in which twelve frames make up a super-
frame. All signaling and synchronization are done in-band.
• Extended Superframe: Extended Superframe, as speciÞed 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 2710 and the Central OfÞce.
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 SigniÞcant 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 trans-
mitted without causing ones density errors. This mode allows for 64
kbps clear channel timeslots.
Switch SW5: DS0 Channel Rate
Use Switch SW5 to set the DS0 rate.
Switch SW6: Clock Mode
Set Switch SW6 to determine the 2710’s transmitter timing.
Note When using the Model 2710 as a high-speed short range
modem, one unit of the link must be conÞgured in Internal Clock
mode, and the opposite end unit must be conÞgured for Network
Clock mode.
SW5 Setting
OFF 56 kbps
ON 64 kbps
SW6 Clock Mode
OFF Network Clock. Transmitter timing is derived from the
received line signal.
ON Internal Clock. Transmitter clock is derived from an internal
oscillator.