TSP Edge User’s Manual
40-400-00065, Rev. E
27
Note:
If using only one port on a Dual T1/E1 that is configured for External
Clock, port 2 must be used and will derive its clock from the equipment under
test. If using both ports, the device connected to Port 1 must use the same
clocking reference as the device connected to port 2.
Signaling
With
Signaling
, both ends need to match, otherwise synchronization will not be
achieved. CAS is considered a more common format for voice traffic while FAS is
used for data traffic. The CRC-4 option is used for error detection. The Edge does not
report CRC-4 information.
Line Coding
For
Line Coding
,
AMI
suffices if no DDS data exists on any of the E1 channels.
HDB3
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 lost of synchronization on
the E1 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 channels are configured for the same
clock, signaling, 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.
Unassigned Channels Idle State
The Unassigned Channels Idle State defines the signaling state for E1 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.
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