DEC Ethernet Transceivers - Revision history

Vaxorcist: /* Homemade Tapping Tools */ Links added

2022-06-11T15:02:34Z

‎Homemade Tapping Tools: Links added

Vaxorcist: /* Homemade Tapping Tools */

2022-06-11T14:55:59Z

‎Homemade Tapping Tools

Vaxorcist: /* Homemade Tapping Tools */ Fixed typo, "Usage instructions" added

2022-06-11T14:54:00Z

‎Homemade Tapping Tools: Fixed typo, "Usage instructions" added

Vaxorcist: Added "Homemade Tapping Tools"

2022-06-11T14:46:10Z

Added "Homemade Tapping Tools"

Vaxorcist: /* Tap Installation Tools */

2022-06-11T12:00:42Z

‎Tap Installation Tools

Vaxorcist: /* Tap Installation Tools */

2022-06-11T12:00:13Z

‎Tap Installation Tools

Vaxorcist: Some more pictures added

2022-06-11T11:57:48Z

Some more pictures added

Jnc: +cat, /* External links */ actual units at CHM, with images

2022-06-10T20:41:35Z

+cat, ‎External links: actual units at CHM, with images

Vaxorcist: Finished "Removable Tap Assembly Instructions"

2022-06-10T16:31:18Z

Finished "Removable Tap Assembly Instructions"

Vaxorcist: Separated from "Ethernet Transceivers" into DEC specific page & "Removable Tap Assembly Instructions" added (partly)

2022-06-10T16:05:23Z

Separated from "Ethernet Transceivers" into DEC specific page & "Removable Tap Assembly Instructions" added (partly)

New page

==DEC Ethernet Transceiver Models==

=== H4000 Ethernet Transceiver (Thickwire) ===
Year of introduction: 1982

You cannot disable the '''[http://www.ethermanage.com/ethernet/sqe/sqe.html Heartbeat]''' feature of the standard H4000 [[Ethernet Transceiver]], there is a special version (H4000-BA) without Heartbeat available in case you need that.

====H4000 with Inclusive Tap====
[[File:H4000_with_Inclusive_Tap.png|400px|thumb|left|H4000 with Inclusive Tap]]

The H4000 Ethernet Transceiver with Inclusive Tap was the very first Ethernet Transceiver from DEC.

It has got two drawbacks:
* If the tap pin gets damaged, the whole unit is inoperable and cannot be repaired.
* It is very inconvenient to mount the unit to a Thickwire segment difficult to access, e.g. located in a ceiling plenum.

 

====H4000 with Removable Tap====
The H4000 Ethernet Transceiver with Removable Tap is an improved version of the model with a fixed tap.

You can tap the cable using the removable tapping unit (which is much smaller and lighter than the complete unit) and attach the rest of the unit when the tapping is done.

If the tap gets damaged, you can use a replacement one.

<Picture of an H4000 with Removable Tap>

=== H4005 Ethernet Transceiver (Thickwire) ===
Year of introduction: 1988?

<Picture of an H4005>

=== DESTA Thinwire Ethernet Station Adapter ===
Year of introduction: 1986

====Early DESTA====
The early DESTA (REV A) is a H4005 with a modified top assembly carrying a female BNC socket.

You can replace the BNC top assembly with that of an H4005 and thus use the early DESTA with Thickwire Ethernet.

On the other hand you can use the top assembly of an early DESTA to use an H4005 for Thinwire Ethernet.

<Picture of an early DESTA>

====Late DESTA====
The late DESTA (REV B) is housed in a slightly smaller box and the BNC socket is fixed.

<Picture of a late DESTA>

=== H3350 Twisted Pair Transceiver ===
Year of introduction: ?

<Picture of an H3350 Twisted Pair Transceiver>

=== DECXM Thinwire Transceiver ===
Year of introduction: ?

<Picture of a DECXM Thinwire Transceiver>

=== DETPM 10BaseT Transceiver ===
Year of introduction: ?

<Picture of a DETPM 10BaseT Transceiver>

==Removable Tap Assembly Instructions==
from: EK-H4005-IN-002 H4005 DIGITAL Ethernet Transceiver With Removable Tap Assembly Installation Card

===Tap Installation Tools===
Not included in tools set; typically good for 10-15 installations

[[File:Tap_01.png|400px|thumb|left|Tap Installation Tools]]

 

===Tap Assembly===

[[File:Tap_02.png|400px|thumb|left|Tap Assembly (DEC P/N 12-24664-01)]]

 

===Preparing Tap Body===

[[File:Tap_03.png|300px|thumb|left|Preparing Tap Body]]

Install braid terminators into tap body.

 

===Positioning Coaxial Cable and Assembling Tap===

[[File:Tap_04.png|400px|thumb|left|Preparing Tap Body]]

Steps:
# Position tap body on black band that is on coaxial cable.
# Slide clamp assembly onto tap body.
# Install clamp screw and tighten with hex wrench.

@@ Line 175: / Line 175: @@
 Usage instructions:
-* Follow DEC instructions except for "Drilling Through Coaxial Cable to Center Conductor".
+* Follow: [[DEC_Ethernet_Transceivers#Removable_Tap_Assembly_Instructions|Removable Tap Assembly Instructions]] except for: [[DEC_Ethernet_Transceivers#Drilling_Through_Coaxial_Cable_to_Center_Conductor|Drilling Through Coaxial Cable to Center Conductor]].
 * Screw in homemade centering bolt until seated.
 * Drill '''carefully by hand''' through centering bolt with a sharp 3mm / 1/8" drill until center conductor is '''exposed, but not damaged'''!
 * Unscrew homemade centering bolt.
-* Follow rest of DEC instructions.
+* Follow rest of: Removable Tap Assembly Instructions.
 ==External links==

@@ Line 175: / Line 175: @@
 Usage instructions:
-* Follow DEC instructions except for ...
+* Follow DEC instructions except for "Drilling Through Coaxial Cable to Center Conductor".
 * Screw in homemade centering bolt until seated.
 * Drill '''carefully by hand''' through centering bolt with a sharp 3mm / 1/8" drill until center conductor is '''exposed, but not damaged'''!
-* Follow rest of DEC instructions
+* Unscrew homemade centering bolt.
 ==External links==

@@ Line 166: / Line 166: @@
 Make:
-* Turn/file down outer diameter of tubular box spanner to 20.5mm / 13/16" maximum for about 15mm / 5/8" at hex end. </br> There is not much wall thickness remaining!
+* Turn/file down outer diameter of tubular box spanner to 20.5mm / 13/16" maximum for about 15mm / 5/8" at hex end. There is not much wall thickness remaining!
 * Shorten bolt to thread length 9.5mm / 3/8"
 * Turn/file down bolt end to core diameter of thread for about 2mm / 3/32"
@@ Line 173: / Line 173: @@
 <br clear=all>
 ==External links==

@@ Line 152: / Line 152: @@
 '''Note'''<br>
 '''The transceiver may be rotated so that the transceiver cable can be connected at the opposite end.'''
 <br clear=all>

@@ Line 78: / Line 78: @@
 [[File:Tap_01.png|400px|thumb|left|Tap Installation Tools]]
-The size of the Allen wrench is 3mm resp. 1/8 inch.
+The size of the Allen wrench is 3 mm resp. 1/8 inch.
 <br clear=all>

← Older revision		Revision as of 12:00, 11 June 2022
Line 77:		Line 77:

	[[File:Tap_01.png\|400px\|thumb\|left\|Tap Installation Tools]]		[[File:Tap_01.png\|400px\|thumb\|left\|Tap Installation Tools]]
		+
		+	The size of the Allen wrench is 3mm resp. 1/8 inch.

	<br clear=all>		<br clear=all>

@@ Line 20: / Line 20: @@
 The H4000 Ethernet Transceiver with Removable Tap is an improved version of the model with a fixed tap.
-You can tap the cable using the removable tapping unit (which is much smaller and lighter than the complete unit) and attach the rest of the unit when the tapping is done.
+[[File:H4000.JPG|400px|thumb|left|DEC H4000 Transceiver with attached Thickwire coax cable]]
-If the tap gets damaged, you can use a replacement one.
+* You can tap the cable using the removable tapping unit (which is much smaller and lighter than the complete unit) and attach the rest of the unit when the tapping is done.
 === H4005 Ethernet Transceiver (Thickwire) ===
 Year of introduction: 1988?
-<Picture of an H4005>
+[[File:H4005.JPG|400px|thumb|left|DEC H4005 Transceiver]]
 === DESTA Thinwire Ethernet Station Adapter ===
@@ Line 35: / Line 38: @@
 ====Early DESTA====
 The early DESTA (REV A) is a H4005 with a modified top assembly carrying a female BNC socket.
@@ Line 41: / Line 46: @@
 On the other hand you can use the top assembly of an early DESTA to use an H4005 for Thinwire Ethernet.
-<Picture of an early DESTA>
+<br clear=all>
 ====Late DESTA====
 The late DESTA (REV B) is housed in a slightly smaller box and the BNC socket is fixed.
-<Picture of a late DESTA>
+<br clear=all>
 === H3350 Twisted Pair Transceiver ===

← Older revision		Revision as of 20:41, 10 June 2022
Line 145:		Line 145:

	<br clear=all>		<br clear=all>
		+
		+	==External links==
		+
		+	* [https://www.computerhistory.org/collections/catalog/X1525.98 Early DEC Ethernet transceiver] - at the [[Computer History Museum\|CHM]], includes image
		+	* [https://www.computerhistory.org/collections/catalog/102625376 H4000 Ethernet Transceiver]
		+
		+	[[Category: DEC Networking‎]]

@@ Line 95: / Line 95: @@
 # Slide clamp assembly onto tap body.
 # Install clamp screw and tighten with hex wrench.
 <br clear=all>