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STM Issue

Hello,

I have an STM-1 link set up b/w 2 remote ends. The links are terminated on routers with NM-1A-OC3-POM. After setting up the link end to end, we discovered that the interface was down and line protocol was down. Looking at the cards physically, The RxCR light was green, RxCl was blank, TxCl was green, RxAlm was amber.

The configuration on Router A

int atm1/0

ip address 10.99.4.70 255.255.255.252

no atm ilmi-keepalive

pvc 1/33

protocol ip 10.99.4.69 broadcast

Router B

int atm1/0

ip address 10.99.4.69 255.255.255.252

no atm ilmi-keepalive

pvc 1/33

protocol ip 10.99.4.70 broadcast

The SFP on the Router is Multimode but we used Singlemode fibres for connections b/w the Router and the ADM

Please what could the problem be?

1 REPLY
Hall of Fame Super Gold

Re: STM Issue

Hi,

you cannot illuminate singlemode fiber with a multimode emitter. To prove that, put a patch in loopback between TX and RX on the router card.

The opposite is possible, for short fiber spans.

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