We have been beating this one up pretty good and the ISP isn't much help. They have tested and retested the line from the demarc to the local switch several times and have seen no problems, and their records show that the ISDN circuits on the property are no where near the Frame circuits we use.
Here is some background on the configuration and the problem at this property. We have a 1721 router in place at the moment with a Serial interface coming back here to Corp for business applications and a seperate BRI interface that they use for their internet access. They have been having an ongoing problem with the ISDN dropping packets, and getting input and CRC errors. It occasionaly drops the connection and comes back up several times and then just stops. here is a sample of what we are dealing with:
BRI0 is up, line protocol is up (spoofing)
Hardware is PQUICC BRI with U interface
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
Last input 00:00:02, output never, output hang never
Last clearing of "show interface" counters 20:38:29
Input queue: 0/75/629/0 (size/max/drops/flushes); Total output drops: 0
The router must be grounded via the mains shield wire. This is normally done via the mains outlet. If this is not available or not good enough, you may connect it to a dedicated ground line.
The ISDN NT1 can be grounded via the telephony cabling or using a dedicated ground.
To test if this is your solution, you may use improvised grounding. In a computer room there is mostly a dedicated gound available but you could also use the central heating or the water pipes for that.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
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