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G.704 1Mbps E1 MultiFlex WAN Card

aruzsinszky
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

Note that framed/Nx64 endpoints, like a router or interface converter, work normally over unframed circuits. You just loose the bandwidth of TS0.

View solution in original post

23 Replies 23

paolo bevilacqua
Hall of Fame
Hall of Fame

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 ...

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,

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.

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,

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.

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,

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

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.

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?

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.

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.

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?

Sorry, in unframed mode there is the problem.

1M or other speed is correct.

What do you want, unframed or Nx64 ?

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