TSP Edge User’s Manual
40-400-00065, Rev. E
25
Framing
With Framing, both ends need to match, otherwise synchronization will not be
achieved. D4 is considered a more common format while ESF (extended superframe)
provides for overhead features such as a data link and CRC-6 for detection of errors
without interrupting the signal. The Edge does not report data link information for
CRC-6 errors.
Line Coding
For Line Coding, AMI suffices if no DDS data exists on any of the T1 channels.
B8ZS is used when DDS data channels are present to compensate for when an all
Zeros state exists (when equipment is off). This can lead to loss of synchronization on
the T1 data stream due to too many successive zeros.
PCM Encoding
For PCM Encoding, the choices are mu-law and a-law. For T1, mu-law is the default.
This is the PCM encoding and companding standard used in North America and
Japan. For E1, a-law is the default and is the PCM encoding and companding
standard used in Europe.
Important:
On Dual T1/E1 modules, both ports are configured for the same
clock, framing , and line coding. Ensure the parameters are consistent with the
configuration of the equipment under test. This information can be found in the
equipment manual or by contacting the vendor.
Line Build-out
The Line Build-out defaults to 0-133 ft (0 dB level) but can be changed for different
distances or dB loss expected on the line.
Unassigned Channels Idle State
The Unassigned Channels Idle State defines the signaling state for T1 channels that
have not been assigned to any control set, and therefore are not associated with any
template. You can select an idle signaling state associated with a particular protocol
or define the actual bit pattern directly.
To change the default idle state for unassigned channels, see “Unassigned Channels
Tab” on page 50. For information about the Channels tab, see “Channels Tab” on
page 29.
