02-25-2009 10:55 AM - edited 03-04-2019 03:43 AM
Hi,
I've got a c1751-V router with 2 VWIC2-1MFT-T1/E1 card.
I want to connect to an old 3Com NBROII router with Telindus Crocus Nx64 Cnv TT X.21/G.703 converter.
Now the test network consists of a 75/120ohm Balun transformator and 2 75ohm koaxial wires.
The configuration is on the Nx64:
- linecoding: HDB3
- coding: CRC4 is enabled
- the time slots which are enabled for 1Mbps (16x64kbps).
I would like a very short example configuring controller E1 0/0 for this 1Mbps G.704 situation.
Now the CD LED is green, AL LED is yellow.
On the Nx64 there isn't AIS or any other alarm.
TIA,
Ruzsi
Solved! Go to Solution.
02-26-2009 10:00 AM
Note that framed/Nx64 endpoints, like a router or interface converter, work normally over unframed circuits. You just loose the bandwidth of TS0.
02-25-2009 01:04 PM
card-type E1 x
controller e1 x/y
clock source internal
channel-group 0 timeslots 1-16
interface serial x/y:0
encapsulation ppp
ip address ...
02-25-2009 01:17 PM
Thanks!
My config is now:
card-type E1 0
controller e1 0/0
clock source internal
channel-group 0 timeslots 1-16
No serial config yet.
Router#sh controllers e1 0/0
E1 0/0 is down.
Applique type is Channelized E1 - balanced
Cablelength is Unknown
Description: G.704 1Mbps to Telindus
Transmitter is sending remote alarm.
Receiver is getting AIS.
alarm-trigger is not set
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is CRC4, Line Code is HDB3, Clock Source is Internal.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (210 seconds elapsed):
1720110 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 210 Unavail Secs
...
Can I understand well something not good?
TIA,
02-25-2009 01:27 PM
The telindus should take clock from E1 side, check.
The balun should have 120 Ohm side to cisco. You can even do without a balun, set "line-termination 75" under controller.
Check cabling, telindus might not be seeing signal from cisco.
02-25-2009 01:37 PM
Thanks.
Which type of signalig do I have to choose on Telindus? Internal, external, etc.?
The balun was made to an other G.703/X.21 converter. Is that standardized?
'Line termination 75' with UTP (symmetric, 120 ohm) cable? Can I use normal UTP (LAN) straight-thru? I have to find out how can I setup Telindus for 120 ohm.
Cable check: koax wires are good.
There aren't any alarms on Telindus. But RX LED on it is strange...
TIA,
02-25-2009 01:47 PM
If 'signaling' means clock, should be external.
baluns are all the same.
You set line-termination 75 and connect a coax cable with RJ-45 connector. Cisco makes them or you make your own.
You can use LAN UTP for E1 but respect proper pair twisting - that is different from ethernet. Never use premade LAN patch cables, you always have to crimp your own.
02-25-2009 01:57 PM
Yes, signaling means clock. Sorry, it was my mistake.
Balun works perfectly on other situation (between different converters). So the "line" is good.
RJ-45 and koax are not an option for me.
Do you have any tips checking the balun and coax together? For example with a normal multimeter or a storage scope?
TIA,
02-25-2009 03:02 PM
Disconnect the bnc connector for router TX. If no changes, the problem is there.
Again, if you are using a pre-made UTP patch between router and balun, that will never work.l
02-25-2009 10:41 PM
I disconnected the BNC at balun which is connected to Telindus BNC IN.
TX LED is disappeared and LOS/LFA red LED is comed up.
On the Cisco card: CD green LED is disappeared. AL LED is remained yellow.
The connection between Cisco E1 card and Telindus: Cisco-120ohm UTP-Balun-2 wire coax-Telindus.
02-25-2009 11:16 PM
I disassembled my "balun". I think it isn't a real balun!
On the UTP (RJ-45) connector side the 1, 2, 3, 5 and 8 pin are used. 1 and 8 pin are connected to each other. There isn't any trafo only 2 BNC connectors. I think Cisco is using only 4 wires (1-2 and 4-5?)
I took a photo. Can I send somewhere?
02-26-2009 01:24 AM
Don't bother with pics. A proper balun must have inside two inductances, that is a wire coil.
Yes the cisco pinout (standard) is TX 1-2, RX 4-5).
As mentioned above the cisco can do 75 Ohm as well.
02-26-2009 01:55 AM
In my doc 1-2: RX and 4-5 TX. I checked the manual of Telindus and I have to crimp a cross cable. I jumpered the Telindus from BNC/75 to the default UTP/120.
In a short time the cable will be ready.
02-26-2009 05:45 AM
New situation:
We did a cross cable for UTP/120 ohm.
(1-2->4-5 and back.)
If I connect the cable between the T1/E1 cards everything seems good.
If I connect to Telindus in structured G.703 mode (G.704) with 1Mbps the statistics the next:
Transmitter is sending remote alarm.
Receiver has loss of frame.
alarm-trigger is not set
Version info Firmware: 20071011, FPGA: 13, spm_count = 0
Framing is CRC4, Line Code is HDB3, Clock Source is Internal.
CRC Threshold is 320. Reported from firmware is 320.
Data in current interval (646 seconds elapsed):
25600 Line Code Violations, 27 Path Code Violations
3 Slip Secs, 1 Fr Loss Secs, 2 Line Err Secs, 0 Degraded Mins
2 Errored Secs, 0 Bursty Err Secs, 2 Severely Err Secs, 537 Unavail Secs
If I switch Telindus to unframed G.703 (2Mbps), AL disappeared and E1 interface is up, no alarms.
What is the problem now?
02-26-2009 06:06 AM
Sorry, in unframed mode there is the problem.
1M or other speed is correct.
02-26-2009 08:56 AM
What do you want, unframed or Nx64 ?
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