Interphase Tech iSPAN 5535 PRI - Manual (Page 79)

Chapter 5: Setting Up WAN Firmware and Hardware
iSPAN PRI PCI ISDN Users Guide 59
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The Edit DS1 Properties button is enabled only when an
American Switch Type is selected.
The DS1 Properties dialog appears:
Figure 5-3. DS1 Properties
Line framing, CRC, and Line code parameters describe
physical level parameters, which cannot be modified on a PRI
Line.