My organisation currently has a wide area network configured as a ring, using our own microwave equipment. The network runs two seperate DS3 circuits. At each location, there is a Lucent AP-1000 with LMC 5245 DS3 Wan Adapter which converts to Ethernet and provide each lan with ethernet service. This network works fine. I am now attempting to add another site using a cisco 3800 router with two (2) NM-1T3 interface cards. My challenge is that the circuit has a numerous amount of errors. The section below highlights the configurations and errors.
All AP-1000 routers Interface: t3 MTU: 4470 Clocking: Internal Crc mode: crc16 Type mode: ds3 Line type:dsx3Cbit Parity Line length: 100 Line coding: dsx3B3ZS SendCode: dsx3SendNoCode Clock source: internal ScramblingMOde: dsx3Cisco
The new Cisco 3800 router with NM-1T3 controller T3 1/0 cablelength 100
interface s1/0 ip address x.x.x.x 255.255.255.0 ip route-cach flow dsu badnwidth 44210
On executing the sh int s1/0 command the follwoing is found Serial1/0 is up, line protocol is up Hardware ss DSXPNM Serial ...... Encapsulation HDLC, crc 16 .....
163959228 input errors, 163959228 CRC, 72386460 frame, 43881477 overrun, 0 ignored, 122414945 abort. DSU mode 0, bandwidth 44210, real bandwidth 44210, scramble 0On executing the sh controller s1/0 command the follwoing is found T3 1/0 is up Applique type subrate T3 No alarms detected MDL tranmission disabled Framing is C-bit Parity, Line code is B3ZS, CLock source internal Everything else is 0.
My Microwave manual provides the following Information on DS3 interface
Data Rate - Asynchronous 44.736Mb/s +- 20ppm Line Code - B3ZS Input - +5.7 to -1.8 dBm at DSX-3 Cross connect attenuated by up to
450ft of cable Output - +1 to +4 dBm, LBO out , 0 to +3 dBm, LBO in (measured all-1s unframed) Pulse Shape - TR-TSY-000499 complaint Impedence - 75 ohms, nominal (10 to 50 MHz)These are my challenges:-
1 - Am I using the right interface card and router? 2 - Am I missing a configuration somewhere? 3 - Are there compatability issues between the two routers?I tried the following(individually, not all at once:-
1 - Changing the modes of the dsu - result - line protocol switch to down 2 - Changing scrambling - result - line protocol switch to down 3 - Changing CLock source to line - result - no change in errors 4 - Changed the parity - line protocol switch to downI am at a complete loss.
Look forward to your responses. Thank You