Sifos Technologies PhyView PVA-3000 User Manual

PVA-3000 Reference Manual
December 2, 2019 Sifos Technologies
Page 9
improve on attenuation (insertion loss), return loss, and crosstalk specifications. In addition, more crosstalk
measurements were defined owing to added sensitivity of 1000BaseT to crosstalk.
10GbaseT was introduced more recently and is largely utilized as a backbone technology at this time. This manual
will focus on 10/100/1000BaseT, the predominant Ethernet edge access technologies that are addressed by the
PhyView Analyzer.
1.2.1. Ethernet Twisted Pair PHY Specification Summary
The following table briefly summarizes a few of the more important specifications related to the 10BaseT, 100BaseTx,
and 1000BaseT physical layers.
Characteristic
10BaseT
IEEE 802.3 Clause 14
100BaseTx
IEEE 802.3 Clause 25
1000BaseT
IEEE 802.3 Clause 40
Transmission Pairs
1 (unidirectional)
1 (unidirectional)
4 (bi-directional)
Signal Coding
Manchester
MLT-3 (tri-level)
PAM-5 (5-level)
Signal Amplitude
2.5 Vpp
2 Vpp
2 Vpp
Amplitude Band
+ 0.3 Vpp
+ 0.1 Vpp
+ 10.7%
Symbol Rate (Baud)
10 MHz + .01%
125 MHz + .005%
125 MHz + .01%
Symbol Density
1 Bit
1 Bit
8 Bits
Edge Rate Strategy
Manchester, 1 edge / bit
Randomizer
Randomizers
Edge Slew Rate
Mask Fit
(typical 5 nsec)
4 + 1 nsec
Mask Fit
(typical 3.6 nsec)
PHY Layer Error
Detection
None
4b/5b Code
Trellis
Forward Error Correction
None
None
Trellis
Differential Impedance
100 +~20
100 +~16 < 30MHz
100 +64,-40 @
60MHz
100 +~17 < 40MHz
100 +97,-50 @
100MHz
Interface Return Loss
< ~ -20 dB
<~ -21.5 dB < 30MHz
<~ -12 dB > 60MHz
<~ -21.5 dB < 40MHz
<~ -9.5 dB @ 100MHz
Loss Tolerance
-11.5 dB @ 10MHz
-24 dB @ 100 MHz
-24 dB @ 100 MHz
Mismatch Tolerance
+15 @ < -15 dB R.L.
-15 dB R.L. to 20MHz
-8 dB R.L @ 100MHz
-15 dB R.L. to 20MHz
-8 dB R.L @ 100MHz
NEXT Crosstalk
Tolerance
-26 dB @ 10MHz
-27.1 dB @ 100MHz
-27.1 dB @ 100MHz
Noise Tolerance
264 mVpk
(below 15MHz)
40mVpp
(below 100MHz)
40mVpp
(below 100MHz)
Jitter Tolerance
7 nsec Pk-Pk
1.4 nsec Pk-Pk
1.4 nsec Pk-Pk, total
0.3 nsec Pk-Pk > 5KHz
Pair Delay Skew
Not Applicable
Not Applicable
50 nsec (to 100MHz)
Bit Error Target
10
-8
10
-8
10
-10
1.2.2. Ethernet Symptom Masking
Ethernet links are universally designed to recognize packet transmission problems both in the Physical and in the MAC
layer, and when encountering a problem, to drop or discard the erred packet or packet segment. At the physical layer,
packet errors appear as defective preambles (or carrier markers) meaning packets that don’t properly start or complete.
In 100BaseT, coding violations are used as an indication of a flawed transmission. In 1000BaseT, sophisticated digital
signal processing can both recognize transmission errors and attempt to correct them before packet data reaches the
MAC layer.
In the MAC layer, CRC checking determines if there is a probable data corruption in the packet (or the CRC code). If
corruption is discovered, the packet is dropped.
Many Ethernet ports have intelligence to monitor link performance and make decisions to drop link and re-link, and in
certain cases, to force a fall-back into a lower rate in order to get better immunity from link impairments. For
example, a link that starts out at 1000BaseT may eventually drop down to 100BaseT to overcome those impairments.

Sifos Technologies PhyView PVA-3000 Specifications

General

Brand	Sifos Technologies
Model	PhyView PVA-3000
Category	Measuring Instruments
Language	English