Chapter 14 - General | 223 |
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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.
