Dear Friends, Thank for your valuable information, I had a question on the E1/T1 conroller port? Previously we have a project connecting for VoIP, we connect the E1/T1 port of 3810 router to the PABX and serial port to the WAN My question 1)What is the difference between E1/T1 controller port and the serial port? Do E1 need ip address to be configured? 2)Can we use E1 controller to connect to the internet service provider? 3)I heard of E1 link (2M) and T1 link (1.544M) Does these two term related to E1/T1 port of the router? That's mean if we want to have E1 link speed we got to use E1/T1 port to connect? Is that true?? Then What I should do if I need a E3 link 4)What router model got E1/T1 controller installed except 3810 Tong -----Original Message----- From: Jay Hennigan [mailto:[EMAIL PROTECTED]] Sent: Thursday, August 03, 2000 12:05 PM To: Sim, CT (Chee Tong) Cc: '[EMAIL PROTECTED]' Subject: Re: what is mean by EIR on the frame relay??? On Thu, 3 Aug 2000, Sim, CT (Chee Tong) wrote: > However, I would like to ask you > > 1)what is mean by EIR on the Frame relay? Can any one tell me? Might you mean CIR? Committed information rate? > > 2)If I found the link is up between two router, Is this a circuit that has worked in the past and stopped, or a new turn-up? The answer to this question can cause a different approach to troubleshooting. Assuming frame-relay encaps because you mentioned frame-relay in question 1... > > router A > interface is up and protocol is down > modem status is DCD=up DSR=up DTR=up RTS=up CTS=up The physical circuit to the router is OK. It _probably_ is talking to the frame-relay switch OK, especially if the circuit has worked in the past and just quit. The DCD=up and CTS=up show that the physical layer is good, or at least connected. If "sho int" contains a line like: LMI enq sent 209473, LMI stat recvd 209473, LMI upd recvd 0, DTE LMI up then the "DTE LMI up" verifies that this router is good to the switch. "sho frame pvc" should show the DLCI as USAGE = LOCAL and STATUS = ACTIVE for the DLCI of the circuit between the two routers if everything is happy. If the remote router is not happy, then you'll see STATUS = INACTIVE. If the PVC isn't built in the switch, you'll see STATUS = DELETED or nothing at all for that DLCI if you're using inarp. > > but at the router B, > the interface is down and protocol is down, > the modem status is DCD=down DSR=up DTR=up RTS=up CTS=down. This router or its CSU/DSU if external is not communicating with the frame-relay switch. Look for trouble on the physical wiring to this router. In the real world, this is almost always a telephone company issue. In a lab, it could be a bad or miswired cable. > What is likely the cause of the problem? A tech at the telco closest to router B looped its NIU while mis-reading a circuit ID trying to fix something else. (That's the most likely cause, but don't expect to find it on the test.) > Is that the modem of router B got > problem or serial port of router B got problem or the link within the > service provider got problem If this is a previously working circuit, it's most likely a telco issue between the frame-relay switch and router B. A loopback plug on the line to the CSU (1-4, 2-5 for T1, 1-7, 2-8 for 56K) cusing DCD to go "up" will isolate it. Note: Telephone companies are notorious for blaming the customer and looping the wrong circuit. Carry a loopback plug in your tool kit. When telco claime "It's good to the NIU", plug your loopback plug into their smartjack and ask them to run to it. Unplug it and see if the loop goes down. In the real world, if a circuit has been working fine for months or years and suddenly quits, what has probably happened is that a telco tech, in the process of troubleshooting something else, accidentally hopped on to your circuit and put a smartjack in loopback. When you call in to report the problem, they'll test things and knock down the loop that they put up by mistake earlier. Then it will work again, and get closed out as another "came clear while testing." The second most likely cause is that someone clipped a butt-set on your data pair which wasn't documented correctly, didn't hear dial tone, and swiped it for something else. This takes longer to fix, but telco will still probably claim "came clear while testing" even though they know better. A lot depends on the competence of your local telephone company. Hint: If they are spending millions of dollars right now on a massive, saturation TV ad campaign just to announce that they're changing their name while under the threat of a labor strike, then perhaps they have their priorities wrong. -- Jay Hennigan - Network Administration - [EMAIL PROTECTED] NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/ WestNet: Connecting you to the planet. 805 884-6323 ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ================================================================== De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is uitsluitend bestemd voor de geadresseerde. 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