Compatible Systems 5.4 - Manual (Page 229)

Chapter 14 - General 223
Contiguous Channels or Alternate Channels
This set of radio buttons determine whether the T1 fraction will occupy every
channel starting with the requested channel, or every other channel. If more
than 12 channels will be used, the Contiguous Channels radio button must be
selected.
• If Contiguous is selected, the T1 fraction will occupy every channel
beginning at the Start Channel. This is the default setting.
• If Alternate is selected, the T1 fraction will occupy every other channel
beginning at the Start Channel.
> Channel Data Rate
These two radio buttons determine whether the internal CSU/DSU will use
64Kbps channels or 56Kbps channels. The default is 64Kbps.
Invert Data
This checkbox instructs the CSU/DSU to invert the data it transmits and to
expect to receive inverted data on the line. This is sometimes done to insure
ones density on the line. The default setting is unchecked.
PRM Transmit
This checkbox enables sending and receiving of Performance Report
Messages (PRM) on the Facility Data Link (FDL). This is only possible when
ESF framing has been selected. The default is enabled.
Line Build Out
This pulldown sets the expected signal range for the CSU/DSU’s receiver.
0db is the default and will be satisfactory in virtually all telco applications.
Other settings may be necessary for dry line applications.
Receive V.54 Inband Loopup
This checkbox instructs the CSU/DSU to respond to V.54 style loopup
commands received over the line. The default setting is on.
Receive ATT Inband Line Loopup
This checkbox instructs the CSU/DSU to respond to ATT 64211 style loopup
commands received over the line. The default setting is on.