TSP Edge User’s Manual
40-400-00065, Rev. E
89
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.
Framing
For
Framing
, both ends need to match otherwise synchronization will not be
achieved. D4 is considered a legacy format while ESF (extended superframe) has
more features available such as CRC-4 for detection of errors without interrupting the
signal.
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 exist (when equipment is off) which can lead to lost of synchronization on
the T1 due to too many successive zeros.
PCM Encoding
The Edge configuration software defaults to mu-law PCM Encoding which is the
North American standard for T1. PCM encoding refers to the process used to digitize
the analog signal. It is necessary to ensure this matches the equipment under test. E1
normally uses a-law PCM encoding.
Important:
On Dual T1/E1, both channels are configured for the same
clock, framing (for T1), signaling (for E1), and line coding. Ensure the
T1/E1 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.
