Standard pinout for V.35 in DB25 connector?
Fred Fierling
on a DB25 connector. Is there a standard pinout for V.35 on a
DB25 connector, de facto or otherwise?
--
Fred Fierling f...@microplex.com Tel: +1 604 444-4232
Microplex Systems Ltd http://microplex.com/ Tel: +1 800 665-7798
8525 Commerce Court Fax: +1 604 444-4239
Burnaby, BC V5A 4N3
Barton F. Bruce / CCA
> A lot of modern WAN equipment comes equipped with V.35 implemented
> on a DB25 connector. Is there a standard pinout for V.35 on a
> DB25 connector, de facto or otherwise?
Are you sure you are seeing v.35 (as in the way Digital Link for one does
it), or do you mean EIA-530 which is becoming more common but is 449 on a db25
connector?
Robert Blackshaw
writes...
He is probably looking at a video telecon system. Due to real estate
restrictions many vendors of VTC bring the V.35 interface out on a
DB-25 connector (I know of at least three who do this). Also V.35
interface cards for PCs simply do not have room for a true V.35
connector. All of the systems I've tested had adapter cables with
DB-25 (or similar) on one end and V.35 connectors on the other. I
don't recall the vendors putting any pinout diagrams in their
manuals and I would suspect that it is everyman for himslef.
Bob
--
Opinions expressed are those of the author and are copyrighted
RB & Associates - Consultants in Multimedia Teleconferencing
Michael W Winslow
>A lot of modern WAN equipment comes equipped with V.35 implemented
>on a DB25 connector. Is there a standard pinout for V.35 on a
>DB25 connector, de facto or otherwise?
>--
>Fred Fierling f...@microplex.com Tel: +1 604 444-4232
>Microplex Systems Ltd http://microplex.com/ Tel: +1 800 665-7798
>8525 Commerce Court Fax: +1 604 444-4239
>Burnaby, BC V5A 4N3
The pinout described in RS-530 is the closest to an actual standard
for V.35 on a DB25. I beleive that there are small differences in
termination impedance, but from my experience, tend to work fine
together.
Lots of vendors have adapters from winchester to db25, but they arent
necessarily the same pinout.. The smart ones have followed the 530
pinout..
By the way, I absolutely HATE those V.35 connectors *grr* (rumor has
it that the inventor of the connector is widely sought for a public
lynching)
Be careful, as the spec for v.35 was changed in 1984. The old V.35 was
overwritten by a V.11 based electrical spec. Very close, but there
are differences (a small piece of interface trivia)
Michael W Winslow
Attach the V.35 monitoring and simulation cables to the MTYP interface
module to analyze
V.35 lines.
The pin assignments for the V.35 cables are as follows:
Pin A Protective Ground (Shield)
Pin B Signal Ground
Pin C Request To Send
Pin D Clear To Send
Pin E Data Set Ready
Pin F Data Carrier Detect
Pin H Data Terminal Ready
Pin J Ring Indicator
Pins P, S Transmit Data
Pins R, T Receive Data
Pins U, W Transmit Clock (from DTE)
Pins V, X Receive Clock
Pins Y, AA Transmit Clock (from DCE)
Pin N Remote Digital Loopback
Pin L Local Analog Loopback
Pin NN Test Mode
RS-530 Cables and Pin Assignments
Attach the RS-530 monitoring and simulation cables to the MTYP
interface module to
analyze RS-530 lines.
The RS-530 cables have D-type 25 pin connectors. The pin assignments
for the RS-530
cables are as follows:
Pin 1 Protective Ground (Shield)
Pins 2, 14 Transmit Data
Pins 3, 16 Receive Data
Pins 4, 19 Request To Send
Pins 5, 13 Clear To Send
Pins 6, 22 Data Set Ready
Pin 7 Signal Ground
Pins 8, 10 Data Carrier Detect
Pins 9, 17 Receive Clock
Pins 11, 24 Transmit Clock (from DTE)
Pins 12, 15 Transmit Clock (from DCE)
Pin 18 Local Analog Loopback
Pins 20, 23 Data Terminal Ready
Pin 21 Remote Digital Loopback
Pin 25 Test Mode
Jeremiah Kristal
>In article <3109BD...@microplex.com>, Fred Fierling <f...@microplex.com> writes:
>> A lot of modern WAN equipment comes equipped with V.35 implemented
>> on a DB25 connector. Is there a standard pinout for V.35 on a
>> DB25 connector, de facto or otherwise?
>Are you sure you are seeing v.35 (as in the way Digital Link for one does
>it), or do you mean EIA-530 which is becoming more common but is 449 on a db25
>connector?
Either way there are pinouts available. I found out after doing my
own by looking at the pinouts for different CSU/DSUs and routers. I
think ADC Kentrox can supply you with the pinouts. I don't have them
with me right now but if you email me I should be able to find it and
send it to you.
Jeremiah
jere...@ios.com
Dave Keith
>writ
>>es:
>>> A lot of modern WAN equipment comes equipped with V.35 implemented
>>> on a DB25 connector. Is there a standard pinout for V.35 on a
>>> DB25 connector, de facto or otherwise?
>>
>>Are you sure you are seeing v.35 (as in the way Digital Link for one does
>>it), or do you mean EIA-530 which is becoming more common but is 449 on a
>db25
>>connector?
>
>restrictions many vendors of VTC bring the V.35 interface out on a
>DB-25 connector (I know of at least three who do this). Also V.35
>interface cards for PCs simply do not have room for a true V.35
>connector. All of the systems I've tested had adapter cables with
>DB-25 (or similar) on one end and V.35 connectors on the other. I
>don't recall the vendors putting any pinout diagrams in their
>manuals and I would suspect that it is everyman for himslef.
In direct response to the original question, there are no 'standards'
for a V.35 interface pinned-out on a DB25. It is very common on all
types of serial equipment, but everyone seems to do it a bit differently.
Yes, one of the reasons for using DB25s instead of Winchesters is size,
but another is cost. Those big blocks are darned expensive.
A few points on other comments. Many vendors do supply a conversion cable,
or make it available separately. Unlike Bob, virtually all of the equipment
that I have seen with V.35 via DB25 provide the pinout in an Appendix to
the manual. In those cases where it is not in the manual, a quick call to
the vendor will get you the info, and push that particular vendor one step
closer to putting the info where it belongs.
dave
Barton F. Bruce / CCA
...
> By the way, I absolutely HATE those V.35 connectors *grr* (rumor has
> it that the inventor of the connector is widely sought for a public
> lynching)
Price?
I love them as they are very rugged. And cisco cables cost the very
same whether it is V.35 or RS232 at the far end, so price isn't the problem.
In general SS screws and Aluminum shells and such seize and gall and
make screwing connectors a bitch.
Be careful what if any lubes you use near contacts!, but I am partial to
"NY-LUBE" which is a wax, not a grease and does not attract dust.
It is designed to be melted to very fluid and then used to impregnate
NYlon and similar plastic parts that do very poorly with grease. Hence
its name. Works well in paste form, though.
The typical elevator repair guy leaves cans on the tops of elevator cabs
and so it is pretty easy to grab a dab which will last forever. They use
it primarily because it doesn't collect dust.
Dip the end of a toothpick in it and smear the tiniest amount in the V.35
screw threads and behind the thrust shoulder where the screw pushes the
connector in (and, if you can reach, where it jacks it out).
Smooth as silk and no more cussing making v.35 connections.
DON'T put it on the contacts.
Terry Kennedy, Operations Mgr.
> By the way, I absolutely HATE those V.35 connectors *grr* (rumor has
> it that the inventor of the connector is widely sought for a public
> lynching)
I suspect this was an existing connector type that got used for this
purpose because it couldn't be confused with anything else. Similarly,
Dataproducts used the 50-pin Winchester MRAC connector (looks just like
a V.35 except it has 50 pins instead of 34 (or is it 36 - I don't re-
member).
Lots of "old" interfaces chose connectors we'd consider wildly inap-
propriate today - V.35 as we're discussing here is a trivial problem.
Consider the IBM channel attach (bus and tag) spec - 1.5" diameter cable
bundles full of coax cables with a bulky and fragile connector. The only
reason it's still used is for compatibility.
RS-530 seems to be slowly taking over from V.35. This seems to be a
pretty good choice from both a size and ease-of-procurement point of view.
This is particularly true in the high-density rackmount market, where a
V.35 connector is too fat to use.
Terry Kennedy Operations Manager, Academic Computing
te...@spcvxa.spc.edu St. Peter's College, Jersey City, NJ USA
+1 201 915 9381 (voice) +1 201 435-3662 (FAX)
Jim Reilly
>
> A lot of modern WAN equipment comes equipped with V.35 implemented
> on a DB25 connector. Is there a standard pinout for V.35 on a
> DB25 connector, de facto or otherwise?
>
> Fred Fierling f...@microplex.com Tel: +1 604 444-4232
> Microplex Systems Ltd http://microplex.com/ Tel: +1 800 665-7798
> 8525 Commerce Court Fax: +1 604 444-4239
> Burnaby, BC V5A 4N3
You are absolutly correct about this. A lot of wan equipment has
implemented v35 signalling on a db25 connector. 60% of these are still
proprietary pinouts. The rest conform to the original EIA-530 pinout that
specified a physical pinout but not an electrical interface. That left it
open to be used with 232,v35, and 422. The spec has been revised recently
to include a electrcal interface of 422. Fastcomm uses the db25 and
provides the capability for all three of the electricals. I have seen
this adopted by adtran (a major player in the csu arena) and also telenex
corporation (test equipment manufacturer) I have heard of others but have
not seen them personally. The nice thing about this is when the
manufacturers of routers and csu's agree on the electrical and physical
it only requires a straight thru cable to work. These items are far
easier to get when you are in the middle on an install and a cable is
missing. But to be on the safe side if a manufacturer implements a v35 on
a db25 they are almost honor bound to provide a cable to get to the
standard winchester plug connector that is common in v35 so get the cable
from the manufacturers of both pieces of equipment and then the only
thing you need to worry about is whether the winchester plugs are male or
female.
--
Jim Reilly
FastComm Communications
1-703-318-4385 9-6 EST
jre...@fastcomm.com
Hugh H Tebault
Labs, its pinout is;
DB25 M34 Pin
1 GND A
2 SD+ P
3 RD+ R
4 ST+ Y
5 RT+ V
6 DSR E
7 RTS C
8 DTR H
9 (used for RS366 dial)
10
11
12
13(used for RS366 dial)
14 SD- S
15 RD- T
16 ST- AA
17 RT- X
18 RTI J
19(used for RS366 dial)
20 GND B
21 (used for RS366 dial)
22
23
24
25 (used for RS366 dial)
This pinout is the only defacto use of a DB25 shell to carry a V.35
signal that I am aware of.
Andrew Birner
: .... The nice thing about this is when the
: it only requires a straight thru cable to work. These items are far
: easier to get when you are in the middle on an install and a cable is
: missing. But to be on the safe side if a manufacturer implements a v35 on
: a db25 they are almost honor bound to provide a cable to get to the
: standard winchester plug connector that is common in v35 so get the cable
: from the manufacturers of both pieces of equipment and then the only
: thing you need to worry about is whether the winchester plugs are male or
: female.
I generally insist on keeping a "true" v.35 interface somewhere between the
two devices. This provides a point at which I can plug in test equipment
without changing any cables. It also makes it much easier to replace the box
at either end -- there's no need to worry about subtle differences in DB25 pin
assignments, and it puts the onus for cable compatibility on the vendor.
: --
: Jim Reilly
: FastComm Communications
: 1-703-318-4385 9-6 EST
: jre...@fastcomm.com
Andrew Birner
Zenith Electronics Corporation
(847) 391-7926
Andrew...@ZenithE.Com
--
-------------------------------------------------------------------------------
Andrew E. Birner, Zenith Electronics Corporation, Glenview, IL 60025
VOX: (708) 391-7926
FAX: (708) 391-7930
Frank Darden
digital link uses on their db-25 (v.35) interface?? This would be on the drop
and insert type cards, sorry no model #'s at this time! thanks!
Frank
John Agosta
>
>Ok, so with that established <gasp of deperation> anyone know the pinouts that
>digital link uses on their db-25 (v.35) interface??
Please don't shoot me ---
But have you tried calling a tech / engineer at Digital Link ?
(bracing for the aftershock...)
ja
Barton F. Bruce / CCA
> In article <4fehmi$3...@nntp.atlanta.com>, fda...@americable.com (Frank Darden) says:
>>
>>Ok, so with that established <gasp of deperation> anyone know the pinouts that
>>digital link uses on their db-25 (v.35) interface??
>
>
> Please don't shoot me ---
> But have you tried calling a tech / engineer at Digital Link ?
Or looked on their web site or ftp site for 'tech-tips'?
I assume they are on the net somehow.