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These release notes describe documentation updates for the following Cisco 600 series products:
For more detailed information about the features of the Cisco 600 series products, refer to the "Related Documentation" section. You can find information about electronic documentation in the "Obtaining Documentation" section.
These release notes provide the following information:
The following section replaces the "Frequently Asked Questions about the WAN LNK LED" section in the Cisco 600 Series Installation and Operation Guide.
The WAN LNK LED blink patterns indicate the connection state of the customer premises equipment (CPE). Table 6-1 describes the meaning of the blink patterns that apply to all the Cisco 600 series CPEs.
| Blink Pattern/Rate | Description |
|---|---|
Steady ON | A link is established to the WAN port. All parameters for physical and logical connections are correctly set. The CPE successfully transmits and receives data. |
Continuous rapid blinking, about 3 blinks per second | The CPE is trying to establish a connection. The pattern continues until a connection is established. |
Intermittent blinking. For the Cisco 675: 6 rapid blinks followed by a 2-second pause before repeating. For the Cisco 676 or 677: 5 rapid blinks followed by a 2-second pause before repeating. | The CPE is trying to establish a physical connection. At this time, the training session is not yet completed; there are no logical connections and negotiated line conditions with other equipment (such as DSLAMs) are not yet established. |
OFF | Check all connections. Ensure the WAN0 interface is not disabled. |
Table 6-2 describes the WAN LNK LED blink patterns that apply to the different versions of the Cisco Broadband Operating System (CBOS) on the Cisco 675 and the problems each blink pattern indicates.
| CBOS Version | Authentication Failure | PVC Failure | Not Trained |
|---|---|---|---|
2.1.x or 2.2.x | Continuous blinking for 12 seconds; then, on for 5 seconds; then it turns off. See "Authentication Problem." | On for approximately 100 seconds; then, it turns off. | Continuous blinking or off. See "The CPE Doesn't Train." |
2.3.x | On. See "Authentication Problem." | On. | 5 rapid blinks followed by a 2-second pause before repeating. See "The CPE Doesn't Train." |
Table 6-3 describes the WAN LNK LED blink patterns that apply to the different versions of CBOS on the Cisco 677 and the problems each blink pattern indicates.
| CBOS Version | Authentication Failure | PVC Failure | Not Trained |
|---|---|---|---|
2.1.x or 2.2.x | Continuous blinking for 12 seconds; then, on for 5 seconds; then, it turns off. See "Authentication Problem." | On for approximately 100 seconds; then, it turns off. | Continuous blinking. See "The CPE Doesn't Train." |
2.3.x | On. See "Authentication Problem." | On. | 5 rapid blinks followed by a 2-second pause before repeating. See "The CPE Doesn't Train." |
Table 6-4 describes the WAN LNK LED blink patterns that apply to the Cisco 678 and the problems each blink pattern indicates.
| RADIUS Failure | PVC Failure | Not Trained |
|---|---|---|
On. See "Authentication Problem." | On. | Off. See "The CPE Doesn't Train." |
See the following sections for descriptions of the possible causes and corrective actions to be taken for the problems described in Table 6-2, Table 6-3, and Table 6-4.
The Cisco 600 series never trains to a system such as the Cisco 6xxx series:
The CPE PPP requests are not being answered by the equipment on the service provider's network, such as a Cisco 7200 series or Cisco 6400. There are a number of possibilities why this would happen:
Use the show errors command to check the contents of the error log.
Use the show ppp command to see a summary of each virtual circuit for PPP mode. Check that the state of each virtual circuit is opened.
cbos#show ppp
VC VPI/VCI STATE MRU USERNAME RADIUS TX RX
wan0-0 01/01 Starting 2048 ppp1 disabled 0 60742
wan0-1 01/02 Starting 2048 ppp2 disabled 0 59950
wan0-2 01/03 Starting 2048 ppp3 disabled 1476 738
wan0-3 01/00 Starting 2048 ppp4 disabled 0 59822
If the CPE trains up and the WAN LNK LED turns off, this is a sign of no ATM cell delineation.Verify that you have the ATM link terminated at the central office end. Without ATM cell delineation, the router will attempt to retrain the line in 1 to 10 seconds.
If the CPE trains up and then immediately drops the connection, the near-end DMT firmware may not be compatible with the far-end DMT firmware. For example, an ITU G.Lite router may not train to an ANSI Issue 1 Central Office. To see the DMT firmware version installed on your router, use the show version command.
If the WAN LNK LED turns off after the CPE has successfully been transferring data end-to-end for some time, this means that the CPE or the service provider's equipment may have a timeout set. Use the show errors command to see if the error log shows that timeouts caused the drop. There are two timeouts that could affect the WAN LNK LED:
After the CPE trains, and the service provider's equipment that is being used to authenticate its PPP session is using RADIUS, then the symptoms described in Table 6-2, Table 6-3, and Table 6-4 could point to a failed RADIUS authentication. Possible reasons for a failed RADIUS authentication include:
Disabling RADIUS on the service provider's equipment would be a simple test to see if it is a RADIUS problem.
Entering the show interface wan0 command provides feedback on the wan0 configuration as well as the actual configuration negotiated with the central office equipment as shown here:
cbos#show interface wan0
wan0 ADSL Physical Port
Line Trained
Actual Configuration:
Overhead Framing: 3
Trellis Coding: Disabled
Standard Compliance: T1.413
Downstream Data Rate: 8032 Kbps
Upstream Data Rate: 864 Kbps
Interleave S Downstream: 1
Interleave D Downstream: 64
Interleave R Downstream: 2
Interleave S Upstream: 4
Interleave D Upstream: 8
Interleave R Upstream: 16
Modem Microcode: G96
DSP version: 0
Operating State: Showtime/Data Mode
Configured:
Echo Cancellation: Disabled
Overhead Framing: 3
Coding Gain: Auto
TX Power Attenuation: 0dB
Trellis Coding: Enabled
Bit Swapping: Disabled
Standard Compliance: Multimode
Remote Standard Compliance:T1.413
Tx Start Bin: 0x6
Tx End Bin: 0x1f
Data Interface: Utopia L1
Status:
Local SNR Margin: 3.5dB
Local Coding Gain: 0.0dB
Local Transmit Power: 12.5dB
Local Attenuation: 28.5dB
Remote Attenuation: 18.5dB
Local Counters:
Interleaved RS Corrected Bytes: 0
Interleaved Symbols with CRC Errors: 2
No Cell Delineation Interleaved: 0
Out of Cell Delineation Interleaved: 0
Header Error Check Counter Interleaved:0
Count of Severely Errored Frames: 0
Count of Loss of Signal Frames: 0
Remote Counters:
Interleaved RS Corrected Bytes: 0
Interleaved Symbols with CRC Errors: 0
No Cell Delineation Interleaved: 0
Header Error Check Counter Interleaved:0
Count of Severely Errored Frames: 0
Count of Loss of Signal Frames: 0
You can also use the show interface wan0-0 command to see the status of the virtual circuit:
cbos#show int wan0-0
WAN0-0 ATM Logical Port
PVC (VPI 1, VCI 1) is open.
ScalaRate set to Auto
AAL 5 UBR Traffic
PPP LCP State: Starting
PPP NCP State (IP Routing): Starting
PPP MRU: 2048 HDLC Framing: enabled MPOA Mode: VC Mux
PPP Login: ppp1
Authentication Type: Autodetecting/PAP
RADIUS: disabled
PPP Tx: 0 Rx: 60742
Dest IP: 205.142.210.1
Dest Mask: 255.255.255.255
IP Port Enabled
Use these release notes in conjunction with the Cisco 600 series product documentation found at http://www.cisco.com/univercd/cc/td/doc/product/dsl_prod/c600s/index.htm.
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