Voiceband Data Performance - Avaya Communication Server 1000 Series Reference

Voiceband data performance

Voiceband data modems can transmit data between private network switches. General
guidelines on the expected performance of various modem types for different ESN connections
are provided in
page 45 and
These guidelines are based on the documented transmission performance of Bell System
private lines and the actual measurement of the system and several metropolitan area private
lines. The expected performance is stated in statistical terms only to reflect the wide
performance range of actual circuits.
The probability of success in completing a data call is based on an overall average of all Bell
System private lines. A particular line or group of lines may be better or worse than the average.
The expected performance stated here should be understood only as a probability.
Table 10: Performance of modems with automatic adaptive equalizers
to modems with automatic adaptive equalizers; no significant improvement is expected with
C2- or C1-conditioned lines compared with basic-quality private lines. Using D1-conditioned
lines (guaranteed lower noise) can improve performance as shown in
of modems with automatic adaptive equalizers
Table 10: Performance of modems with automatic adaptive equalizers
11: Performance of modems with fixed equalizers
performance for ESN connections with one, two, and three trunks in tandem. The percentage
of successful calls is presented according to modem bit-rate.
For modems without automatic (fixed) equalizers, significant improvement over basic line
performance can result from using C1 or C2 conditioning, as shown in
of modems with fixed equalizers
Table 10: Performance of modems with automatic adaptive equalizers
Number of trunks
connected in tandem
Electronic Switched Network Reference — Signaling and Transmission
b. 9.1 dB for calls originating at main stations
Table 10: Performance of modems with automatic adaptive equalizers
Table 11: Performance of modems with fixed equalizers
on page 46.
Modem bit rate (probability of success)
Basic C1, C2 conditioning
1 2400 b/s (80%)
2 2400 b/s (50%)
3 Not recommended
Voiceband data performance
on page 45.
on page 46 specify the expected
D1 conditioning (4-wire
facility)
4800 b/s (<80%)
4800 b/s (50%)
2400 b/s (50%)
on
on page 46.
on page 45 applies
Table 10: Performance
on page 45 and Table
Table 11: Performance
August 2011 45