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2-64 TAS Series II Operations Manual
IN
PAL
LINKS
EPAL
LINKS
OUT
/EP,P0/
OR
IN
EPAL
LINKS
PAL
LINKS
OUT
/EP,P1/
Figure 2-26. Digital Channel Configuration
EPAL Module Applications
The EPAL module can be used to characterize the performance of modems, fax
machines or other types of data communications equipment or voice equipment
against the types of impairments that are unique to digital transmission facilities.
This type of characterization is very important because digital facilities are
encountered on a very large percentage of Public Switched Telephone Network
(PSTN) and private network connections. Examples of these facilities include T1
trunks or digital subscriber loop carrier systems.
The EPAL module provides the capability to test error rate, throughput and other
types of performance against the following transmission characteristics:
•
Mu-law (domestic) and A-law (international) PCM quantization noise
•
ADPCM (international) bit compression distortion
•
Frame Slip errors
PARAMETER
ECI Link 1 PCM Coding
OKI Link 2 PCM Coding
ECI Link 1 PCM Rate
OKI Link 2 PCM Rate
Frame Slip Errored Link
Frame Slip Interarrival Time
Digital Channel Position
PAL Relative to EPAL
DEFAULT VALUE
None
None
64 kbps
64 kbps
ECI Link 1
60 sec
After Analog Channel
After EPAL Links
RANGE OF VALUES
None, A-law or Mu-law
None, A-law or Mu-law
32 or 64 kbps
24, 32 or 64 kbps
Link 1 or 2
1/10 to 32767/10 sec
Before or After Analog
Before or After EPAL Links
Table 2-21. EXTENDED PCM/ADPCM Parameter Summary