Conexant/Rockwell
- Go to Start > Program > Accessories > Hyperterminal. (You can install Hyperterminal through Add/Remove Programs if you do not have it).
- Click on the Hyperterm program.
- Name the connection "Test" and click OK.
- Enter the phone number for your ISP connection.
- Ensure that it is set to be using your Conexant modem, and click OK.
- Click Dial.
- After the handshaking is done, you should see on the screen the word: "Login", though this does vary from ISP to ISP.
- Wait a little while, say 15-60 seconds so you are connected for a bit.
- Disconnect by using the pulldown menu under Call, then select Disconnect.
- After you are disconnected, type AT#UG, press ENTER, and one of the following outputs should appear with the 0's
filled in(depending on modem firmware version):
<VERSION=07>
<CALL SETUP RESULT=Data Answer>
<V.8 CM octet string="">
<V.8 JM octet string="">
<RX SIG POWER DB=15, TX SIG POWER DB=15, S/N RATIO DB=33>
<TX MOD=K56FLEX, TX SYMBOL RATE=3200, TX CARRIER FREQ=1829>
<RX MOD=K56FLEX, RX SYMBOL RATE=8000, RX CARRIER FREQ=0>
<TX FIRST DATA RATE=24000, RX FIRST DATA RATE=48000>
<CARRIER LOSS=0, RATE RENEG=0>
<RETRAINS REQ=0, RETRAINS DET=0>
<TX FINAL RATE=24000, RX FINAL RATE=48000>
<PROTOCOL NEGOTIATION=LAPM>
<COMPRESSION NEGOTIATION=V42BIS>
<TERMINATION CAUSE=Unknown>
<V8BIS FLEX VERSION=43, V8BIS DSP VERSION=47>
<RATE RENEG REQ=0, RATE RENEG DET=0>
<HIGH PASS FILTER ENABLED=0>
<ROBBED BIT PATTERN=0>
<DIGITAL PAD DETECTED=0, DIGITAL LOSS ESTIMATE=0>
<EQM=145E, TRAINING EQM SUM=AF22>
OR
<VERSION=10>
<CALL SETUP RESULT=Detected Data Answer Tone>
<MULTIMEDIA MODE=Data Only>
<DTE-DCE MODE=Async data>
<V.8 CM octet string="">
<V.8 JM octet string="">
<RX SIG POWER DB=21, TX SIG POWER DB=15, S/N RATIO DB=33>
<V.34 INFO bit map =1911693856>
<TX MOD=V.90, TX SYMBOL RATE=3200, TX CARRIER FREQ=1829>
<RX MOD=V.90, RX SYMBOL RATE=8000, RX CARRIER FREQ=0>
<TX FIRST DATA RATE=26400, RX FIRST DATA RATE=46667>
<CARRIER LOSS=0, RATE RENEG=0>
<RETRAINS REQ=0, RETRAINS DET=0>
<TX FINAL RATE=26400, RX FINAL RATE=46667>
<PROTOCOL NEGOTIATION=LAPM>
<EC FRAME SIZE=80>
<EC LINK TIMEOUTS=0>
<EC LINK NAKS=0>
<COMPRESSION NEGOTIATION=V42BIS>
<COMPRESSION DICTIONARY SIZE=800>
<TX FLOW CONTROL=2>
<RX FLOW CONTROL=2>
<TX CHARS SENT FROM DTE=9>
<RX CHARS SENT TO DTE=B5>
<TX CHARS LOST=0>
<RX CHARS LOST=0>
<TX FRAME COUNT=3>
<RX FRAME COUNT=6>
<TX FRAME ERROR COUNT=0>
<RX FRAME ERROR COUNT=0>
<TERMINATION CAUSE=Call in progress>
<V8BIS FLEX VERSION=43, V8BIS DSP VERSION=47>
<RATE RENEG REQ=0, RATE RENEG DET=0>
<HIGH PASS FILTER ENABLED=0>
<ROBBED BIT PATTERN=0>
<DIGITAL PAD DETECTED=0, DIGITAL LOSS ESTIMATE=2000>
<Cnt1=1, Det1=0, Res1=0>
<EQM=2168, TRAINING EQM SUM=CFA8>
Basic Analysis of AT#UG:
Here you want to concentrate on the S/N Ratio DB=? field. If the number for this item is under 40
you may have problems with high speed v90 connections. Below is a chart that indicates about what speeds will remain
stable to semi-stable under an environment with that level of S/N Ratio. Note that you CAN connect at higher speeds with
these S/N Ratios, and perhaps lower, and you CAN have a connection without dropped connections, but the lower the S/N Ratios,
the more unstable any connection you receive becomes. Though the ratio may be poor, the actual "damage" that the noise
causes can vary from modem to modem, connection to connection.
| S/N Ratio Range (Note: S/N Ratio = Signal to Noise Ratio) |
Expected "Stable" Speed |
| 40+ |
33,600 - 56,000 |
| 37-40 |
33,600-56,000 (a little unstable at high speeds) |
| 34-37 |
31,200-33,600 |
| 31-34 |
28,800-31,200 |
| 29-31 |
26,400-28,800 |
| 28-29 |
24,000-26,400 |
| 25-28 |
16,800-24,000 |
| 23-25 |
14,400-16,800 (NOTE: If your SNR is around this level or lower the FCC may step in if your telco won't fix it,
this level is not required to be supported, but often is by local teclos and must be upheld if in their charter.) |
| 21-23 |
12,000-14,400 |
| 18-21 |
9600-12,000 (NOTE: If your SNR is around this level or lower the FCC will step in if your telco won't fix it,
this level is REQUIRED, BARE MINIMUM support.) |
| 14-18 |
7200-9600 |
| 13-14 |
4800-7200 |
| 6-13 |
2400-4800 |
| 1-6 |
300-2400 if you are lucky enough to connect. |
- Next type in AT%L, press ENTER, and the following should appear with the 0's filled in:
000
Basic Analysis of AT%L:
This is the Line Signal Level for your telephone line. This value is measured in -dBm's. If the value represented displays
over 030, then you may have signal problems with your phone line.
- Next type in AT%Q, press ENTER, and the following should appear with the 0's filled in:
000
Basic Analysis of AT%Q:
This is the Line Quality for your telephone line. This value indicates represents the number of re-transmissions the
modem has performed over a specific period of time. A value over 030 may indicate some heavy line noise, and values that go
over 060 may indicate some SERIOUS noise problems.
- Next type in AT&V1, press ENTER, and the following should appear with the 0's filled in:
TERMINATION REASON.......... 0
LAST TX data rate........... 0
HIGHEST TX data rate........ 0
LAST RX data rate........... 0
HIGHEST RX data rate........ 0
Error correction PROTOCOL... 0
Data COMPRESSION............ 0
Line QUALITY................ 0
Receive LEVEL............... 0
Highest SPX Receive State... 0
Highest SPX Transmit State.. 0
EQM Sum Value............... 0
RBS Pattern detected........ 0
Data Rate Dropped in kbps... 0
Digital Pad Detected........ 0
Basic Analysis of AT&V1:
The major points of this output are Line QUALITY, Receive LEVEL, and EQM Sum Value. Line QUALITY should be the same or
similar to the AT%Q output. This value indicates represents the number of re-transmissions the modem has performed
over a specific period of time. A value around 60-70 is usually stable for a 28.8 connection. A value over 030 may
indicate some heavy line noise, and values that go over 060 may indicate some SERIOUS noise problems. The Receive LEVEL
should be the same or similar to the AT%L output. This is the Line Signal Level for your telephone line. This value
is measured in -dBm's. If the value represented displays over 030, then you may have signal problems with your phone
line. The EQM Sum Value is the Eye Quality Monitor Sum Value which is determined by calibration responses and echo
cancellation. This value helps to determine the initial connect rate. This value is listed in Hexadecimal so you will
first have to convert it to decimal. Here is a chart to do so:
|
|
|
2nd digit->| 0 1 2 3 4 5 6 7 8 9 A B C D E F
1st digit |
| |
\|/ |
----------------------------------------------------------------------------
0 | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
2 | 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
3 | 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
4 | 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
5 | 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
6 | 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
7 |112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
8 |128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
9 |144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
A |160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
B |176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
C |192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207
D |208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
E |224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239
F |240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
The EQM is not a great way to determine if you have noise or not (though it does decide what connection speed you will
receive, so it is directly related), but if you do have a value of 01FF or higher you most likely have some issues that need
to be addressed.
This page was last modified on Saturday, 05-Feb-2011 15:13:38 EST.
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