Connecting E1 G.703/G.704 120-OHM to Black Box G.703 to Ethernet Bridge

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Feb 11th, 2008
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Hi all,

This problem has been bugging me for the last few days. I cannot seem to get the physical layer up for the connection between the DB-15 presentation on the E1 card on my 7206VXR and my BlackBox G.703 converter on RJ-48C.

I have tried various pinouts and am now losing my rag with it. I can get my line working on an 8-port port adapter card but not this card.

The following is my config on the serial interface:

interface serial 1/0

encapsulation ppp

clock source internal

timeslot 0-0

If anyone could suggest anything I would be eternally grateful.

Kind regards,


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paolo bevilacqua Mon, 02/11/2008 - 03:21
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Hi, please send show controllers e1 when connected via the cable pinout you trust better.

LordFlasheart Mon, 02/11/2008 - 04:57
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Router#sh controller s1/0

4ME1-BAL: show controller:

PAS unit 0, subunit 0, f/w version 1-45, rev ID 0x2800001, version 3

idb = 0x6435972C, ds = 0x6435AF54, ssb=0x6435B308

Clock mux=0x0, ucmd_ctrl=0x4, port_status=0x65

Serial config=0x8, line config=0x360202

maxdgram=1608, bufpool=48Kb, 96 particles

DCD up, BER inactive, NELR inactive, FELR inactiveline state: down

cable type : G703 (BAL) cable, received clockrate 246

base0 registers=0x3C800000, base1 registers=0x3C802000

mxt_ds=0x654702F8, rx ring entries=48, tx ring entries=64

rxring=0xE350F00, rxr shadow=0x64361BA8, rx_head=0

txring=0xE3510C0, txr shadow=0x64361E14, tx_head=1, tx_tail=1, tx_count=0

throttled=0, enabled=0

halted=0, last halt reason=0

Microcode fatal errors=0

rx_no_eop_err=0, rx_no_stp_err=0, rx_no_eop_stp_err=0

rx_no_buf=0, rx_soft_overrun_err=0, dump_err= 0, bogus=0, mxt_flags=0x20

tx_underrun_err=0, tx_soft_underrun_err=0, tx_limited=1(2)

tx_fullring=0, tx_started=1, mxt_flush_count=0

rx_int_count=15160, tx_int_count=14

setup_me1=0x8002, read_me1=0x1, signals_me1=0x0

paolo bevilacqua Mon, 02/11/2008 - 05:35
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Hi, you should be able to enter "show controllers E1 1/0", don't you ?

LordFlasheart Mon, 02/11/2008 - 06:32
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Uh, no unfortunately.

The card has implicit controllers in the serial interfaces so you can only run "show controller serial x/y". I can do a "show controller e1" but will not take any other input and when I commit that command it comes back empty.

Just to confirm, the card in question is a 4-port E1 G.703/G.704 120 OHM

paolo bevilacqua Mon, 02/11/2008 - 10:46
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Yes, I do realize now which card you have.

The show controller is telling it has loss of signal, unfortunately short of asking how you wired the cable, there's nothing I can suggest.

LordFlasheart Mon, 02/11/2008 - 04:58
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Out of interest, when I flick on the local loop switch on the BlackBox converter the line comes up.


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