Phone Cabling Notes, for German, American, & British Interconnection. Author Julian H. Stacey http://www.berklix.com/~jhs/standards/phone Tabs: If your browser does not represent a tab character as 8 spaces, diagrams in this file wont align properly, ie vertical pipe symbols '|' in these next 2 lines should align: | | |-------| If you are using the Unix vi editor or similar, use: :se ts=8 See Also: http://www.berklix.com/~jhs/standards/rs232.v24 http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/src/jhs/etc/devd/berklix.conf Voltages & Impedances (@ 2016-12-09): http://www.hermonlabs.com/products/innerData/pdf/Analog%20Telephony%20Overview.pdf Plugs & Sockets: German http://de.wikipedia.org/wiki/Telekommunikations-Anschluss-Einheit British http://en.wikipedia.org/wiki/British_telephone_socket American http://en.wikipedia.org/wiki/Registered_jack#RJ45 http://en.wikipedia.org/wiki/Modular_connector#6P4C Wiring Precepts: Privacy/Sharing: German: They love privacy (paranoid about camera photos of faces etc), they expect once handset is lifted, others can't listen. Lifting handset on a fax machine plugged into left N socket of an FNF triple socket, probably interrupts the signal from being passed further to a phone plugged in to middle F socket. Each device may (only if a 6 pin plug And cable) pass signal back to next device, until a handset is lifted. (Can be wired around of course) British: Allow multiple handsets to be lifted simultaneously, allowing "party calls" (lots of long distance families etc eg commonwealth & america etc) . I modified many of my German triple sockets to allow party calls. Ringing: Americans ring without earth. British ring with earth. Germans ring without earth. 2 Signal lines on a USA western connector: American: use center 2 British: not the same as American. German: inner 2 Circuit Diagrams Here: Left-Right Aspect: Sockets are viewed; From air in room, looking toward brick/ concrete/ wood wall, or from air into mobile equipment eg router with a socket. (Not viewed as by a technician looking into the back of a German NFN 3 way divider socket). Plugs are viewed: looking along cable toward plug further away. (or for German plugs (that have cable at right angles to contact), with plug in socket in wall, cable hanging down, with eyes nearer blank surface of plug, & metal contacts further away.) So plugs & sockets are draw to match. No idea if this is how manufacturer catalogues present products. My Symbols: # Plastic edge. 0 Plastic moulding slot, digit '0' to show no material ie hole. X Metal contact, X probably to show junction of contacts. [] Metal contacts in a German socket, spring loaded & contact adjacent contact unless a plug is pushed in to disconnect them. <> Locator/polariser lugs, protruding on a German phone plug. ! Indicate supplied wires in a socketas sold, additional to pcb ^ Continuity when no plug is inserted (ie spring loaded pins within the socket that touch, until an inserted plug seperates) V As '^' but with a connecting soldered bridge added by JHS@. Wires Cross ? Or Join ? : As per IEE/BT/etc conventions in use back to at least 1975, (invented pre computer, to cope with blurry blueprints & pencils, & equally appropriate to this Ascii art), where lines cross: 2 wires cross with No connection below: | --------+---- | 2 wires With connection below : | --------+-+--- | Deutsche Telekom Naming Convention: Socket Type Name: ADo pre 1987 = Anschlussdose TAE new 1987 = Telekommunikations-Anschluss-Einheit Letter Embossed Above Each Socket: N = Nicht- fernmeld- apparat = Non phone = Answerphone F = Fern- meld- apparat = Phone Wecker = Bell Erd = Earth =============================================================================== USA Western Crossed System (some normal cables inc. my coiled springy cables) Also Long white cable purchased by JHS@. Also US Robotics Modem has 2 sockets (1 for phone, 1 for line). the connections are crossed, as below. (Ex Sanyo Answerphone TAS 3100, 2 sockets added by JHS@ were wired by me crossed, signal tapped off centre 2.) ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### | | | | \ \ / / \ \/ / \ /\ / X X / \/ \ | /\ | | / \ | \/ \/ /\ /\ / \ | \ | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Socket ###################### =============================================================================== USA Western Straight, not crossed System (some purchased cables inc. Long grey 2 core cable that came with http://tv-silencer.com/ ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### | | | | | | | | ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### =============================================================================== USA Western Double & Triple USA/Western sockets (as purchased from Hartnagel schiller str, cream coloured plastic,) are (all 3 sockets) wired straight, not crossed. 2 x Double socket + 1 plug with push release lever: Straight 4 wire =============================================================================== USA Western Double socket + 1 plug + push release lever, labelled L1 L2 ###### ######### ######### # 0 X X X X 0 # Western Plug ###################### | | +--+--+---------------------+ | | | | | | | +------------------+--+ | | | | | | | ###### | ###### ######### ######### ######### ######### # 0 X X X X 0 # # 0 X X X X 0 # Western Sockets ###################### ###################### L1 L2 =============================================================================== USA Western Double Socket (circuit drawn by me on side) ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### \ / \ / \ / \ / ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### =============================================================================== USA Western Double Socket (normal straight) ###### ######### ######### # 0 X X X X 0 # Western Socket ###################### | | | | | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Socket ###################### =============================================================================== USA Western Extender With Plug & Socket, Socket is black +------------------ Grey | +--------------- Pink | | +------------ Yellow | | | +--------- Green | | | | +------ Brown | | | | | +--- White | | ###### | | ######### ######### # 0 X X X X 0 # Western Socket 6 Pin Pre-Wired ###################### | | | | | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug I added, Only 4 pin ###################### | | | | | | | +------ Brown | | +--------- Green | +------------ Yellow +--------------- Pink =============================================================================== White Deutsche Telekom plug with Western Socket, Converter marked "DSL", to fit on Y combi cable of a Fritz 7490 DSL Router. Also same for un-expected cable with 2nd Fritz 7490 cable with Deutsche Telekom plug & Western plug. ####### Plug # F # #3] [4# # # +----#2] 5# | # # | +--#1] 6# | | <# #> | | ####### | +-----+ +----+ | Green | | Red ###### ############ ############ # 0 0 0 X X 0 0 0 # Western Plug 8 slot size ############################ =============================================================================== Black Deutsche Telekom plug with Western Socket, Converter marked "TEL", to fit on Y combi cable of a Fritz 7490 DSL Router ####### Plug # F # #3] [4# Green # # +--------#2] 5# | # # | +--#1] 6# | | <# #> | | ####### | +--------------+ | Red | | ###### ############ ############ # X 0 0 0 0 0 0 X # Western Plug 8 slot size ############################ =============================================================================== German Telekom Y Cable from Fritz 7490 DSL Router Colours Approximate A=Red Orange, B=Green, C=Orange, D=Blue+White, E=Blue, F=Orange, G=Green, H=Green. ###### ############ ############ Router, 259 on plug. # A B C D E F G H # Western Plugs 8 slot size. ############################ | | | | | | | | +-------+--+--+--+ | | | +-------+ | +----+--+--+-----+ +--+----------+--------+ | | | | | +-------+ | | | | | +--+-------------------+--+--+ | | | | +----------+ | | | | | | +----------------+-----+ | | | | ###### | | ###### | | ############ ############ ############ ############ # 0 0 0 X X 0 0 0 #White # X 0 X X X X 0 X # Black ############################DSL ############################ Tel =============================================================================== Weird: German Non Phone (N) Plug to Western Plug Tan colour cable, welded plastic, inherited by JHS@: What this weird config is I don't know, so I've marked cable as weird, should work on a USA 2 wire device though. Possibly not for a phone as it uses all 6 poles ? Maybe it was for Ethernet ? http://de.wikipedia.org/wiki/Ethernet-Anschlussdose +----------------------+ +-+--------------------+ | | |+-----------------+ | | | || ####### | | | Plug | || # N # | | | | |+--------#3] [4#--+-+ | | | <# #> | | | | +-----#2] 5#--+-+ | | | | # # | | | | | | +--#1] 6#--+-+-+ | | | | # # | | | | | | ####### | | | | \ / | | | | \/ +-----+ | | \ /\ | | | \ / \ +--+-------+ | | | | | | | | ###### | | ######### ######### # X X X X X X # Western Plug ###################### =============================================================================== German Non Phone (N) Plug to Western Plug, all 6 connectors in use, Grey Cable +-----------------+ | ####### | | # N # | +--+--------#3] [4#--+-+ | | <# #> | | | | +-----#2] 5#--+ | | | | # # | | | | +--#1] 6#--+ | | | | | # # | | | | | | ####### | | | | | | | | | | | | +--------+ | | | | | | +-------+ | | | | | | | | ###### | | ######### ######### # X X X X X X # Western Plug ###################### =============================================================================== German Non Phone (N) Plug to Western Plug, all 6 connectors in use, 2 x Black Cables, Grey inserts in German plugs. +-----------------+ | ####### | | # N # | +--+--------#3] [4#--+---+ | | <# #> | | | | +-----#2] 5#--+-+ | | | | # # | | | | | | +--#1] 6#--+ | | | | | | # # | | | | | | ####### | | | | | | | | | | | | +----------+ | | | | | | +---------+ | | | | | | | | ###### | | ######### ######### # X X X X X X # Western Plug ###################### =============================================================================== German Non Phone (N) Plug to Western Plug, all 6 connectors in use, 1 x Black Cable, Black insert in German plug. +--------------------+ | ####### | | # N # | | +--------#3] [4#--+-+ | | <# #> | | | | +-----#2] 5#--+ | | | | # # | | | | +--#1] 6#--+ | | | | | # # | | | | | | ####### | | | | | | +-----+ | | | | | | | | | | | +--+-------+ | | | | | | | | ###### | | ######### ######### # X X X X X X # Western Plug ###################### =============================================================================== German Phone (F) Plug to Western Plug Cable purchased by JHS@: ####### Plug # F # +--------#3] [4#--+ | # # | | +-----#2] 5# | | | # # | | | +--#1] 6# | | | | <# #> | | | | ####### | | | | | | | | +--------+ | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug ###################### =============================================================================== German Phone (F) Socket to Western Plug Inherited by JHS@, allows binatone & Megaset to work on PBX: ####### Plug # F # +--------#3] [4#--+ | # # | | +-----#2]^[5# | | | # # | | | +--#1]^[6# | | | | <# #> | | | | ####### | | | | | | | | +--------+ | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug ###################### w g b y white green brown yellow =============================================================================== German Phone (F) Plug to Western Plug as supplied connected to DT Signo 1 Phone Phone does not work if this cable is removed & a western-western is used to connect phone to PBX. Phone did work (ie dial tone heard) if Grey Cable from BT memory phone was temporarily inserted. Cable (when borrowed) also provided a dial tone on Megaset 930 ####### Plug # F # (Wecker) +----------#3] [4#--+ (Erd) | # # | (Lb) | +----#2] 5# | (b2) | | # # | (La) +--+-----+----#1] 6# | (a2) | | | <# #> | | | | ####### | | | +--+-------------+ | | | | | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug ###################### 6 5 4 3 2 1 (numbers on this line derived from Megaset 930) =============================================================================== German Phone Socket (N) on black cable | Black Cable | ####### Socket # N # Green --#3] [4#-- Yellow <# #> Brown --#2]^[5#-- Grey # # White --#1]^[6#-- Pink # # ####### =============================================================================== JHS@ Built Converter to fit between PBX & Megaset 930, that if cascaded onto a normal ["German Phone (F) Plug to Western Plug" (as used for USA stuff)] would also be same pin out for use with a Megaset Yellow, Green, Brown, White ###### ######### ######### # 0 X X X X 0 # Western Plug Short cable ###################### (connect this end to a cable with a | | | | german plug one end, & a western | \ / | for a USA appliance the other end). | /\ | \ / \ / \/ \/ /\ /\ / \ / | | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug Long cable ###################### (connect this end to Megaset 930) Yellow, Green, Red, Black =============================================================================== German Non-Phone (N) Plug to Western Plug Cable purchased by JHS@: Grey plug, silver cable, 2 wire) ( At 2017-02 I have 3 N plugs with just 2 wire cables, they all have the 1-6 & 2-5 connections inside plug, seems to be systematic ). ####### Plug # N # #3 4# <# #> +-----#2]-[5# | # # | +--#1]-[6# | | # # | | ####### | | ###### ######### ######### # 0 0 X X 0 0 # Western Plug ###################### =============================================================================== German Non-Phone (N) Plug to 2 Western Plugs "Doppel Anschlusskabel fuer import modems und import telefone zugleich TAE-Stecker an 2 x RJ11-Stecker (6P4C) Codierung = TAE/N, Modem=durchgeschleift Manufacturer: TS-Elektronik Art Nr T2AA-05" (From Todd) ####### Plug # N # #3 4# <# #> +--#2] [5#---------------+ | # # | +--+--#1] [6#---------------+-+ | | # # | | | | ####### | | | | | | White ###### ###### Black Cable ######### ######### ######### ######### Cable Western # 0 0 X X 0 0 # # 0 0 X X 0 0 # Western Plug ###################### ###################### Plug =============================================================================== Siemens Megaset 930 Radio Phone page 26: Belegung der Telefonanschlussschnur 6 Nicht belegt 5 La gelb 4 W grun 3 E braun 2 Lb weiss 1 nicht belegt =============================================================================== BT To Western, black cable, as found 2017-01 between Thomson WPJ530U Wireless Phone Socket System & Amstrad DRX780UK-C BSkyB 14068 ###################### ## # 0 X X X X 0 # ## BT Plug # # ## ###################### ## \ / \ / \/ \/ /\ /\ / \ / \ | ###### | ######### ######### # 0 X X X X 0 # Western Plug ###################### Y G R B e r e l l e d a l e c o n k w Voltages: +50 0 =============================================================================== BT To Western, another flat black cable measured 2017-01 ###################### ## # 0 X X X X 0 # ## BT Plug # # ## ###################### ## \ / \ / \ / ###### ######### ######### # 0 X X X X 0 # Western Plug ###################### G R r e e d e n =============================================================================== Cable (black, coiled) between Headset Phone & BT Plug long retainer tag, designed to be removed, Phone works (rings even) if this cable is removed & a western-western is used to connect phone to PBX. ###################### ## # 0 X X X X 0 # ## BT Plug # # ## ###################### ## \ / \ / \ / ###### ######### ######### # 0 X X X X 0 # Western Plug ###################### = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Notes on audio part of headset phone: Double CoAx Cable Between Headset phone & Headset Tip of plug: Ear Piece (Mono) Aprox 35 Ohm on replacement unit. Mid shank: Microphone Aprox 1500 Ohm Top of shank: Earth X 2 -------------------- Other Walkman style headphones: Tip of plug: Left Mid shank: Right Top of shank: Earth Common --------- Grey mono 8 Mel Orange Mono Plug 105 No foam mono: 33 Pan Am 270 Purple plastic 33 Red+Black foam 15 Sony 33 White mono 8 =============================================================================== Cable (grey) from British Telecom 16 memory phone short retainer tag, designed not to be removed, Phone does not work if this cable is removed & a western-western is used to connect phone to PBX. ###################### ## # 0 X X X X 0 # ## BT Plug # # ## ###################### ## | | | | | | | | | ###### | ######### ######### # 0 X X X X 0 # Western Plug ###################### =============================================================================== BT Sockets ###################### ## # 0 X X X X 0 # ## # # ## ###################### ## | | | | | | | Red | | Blue | Green White - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Headset Phone Only works on red & white. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Previous usage: red & blue Loud dial tone between Red & White Quiet dial tone between Red & Blue BT Slim Phone Of the red white green blue wires, only 2 pairs present an audible dial tone when rest switches are simultaneously pressed: red + white 7.5K Up o/c down red + blue 50K up o/c down red + blue was selected as it presents a higher impedance less likely to be detected by the post, however bell pulses are heard on the main (old ) phone, & meter on old phone does not allways pulse properly for outgoing calls made from the extension. =============================================================================== NFF EXPANSION BOX for MK (as purchased, + Western Socket for answerphone added by JHS@) (cloned & BT socket added to my clone by JHS@ as shown in (BT )) ####### Plug # F # Wecker +--#3] [4#--+ Erd | # # | (BT White) Lb +--+--#2] 5# | b2 | | # # | (BT Red) La +--+--+--#1] 6# | a2 | | | <# #> | | | | ####### | | | | +--------+ | | | | ###################### Screw Block # 1 2 3 4 5 6 # 1=White, 2=Brown, 3=Green, 3=Yellow ###################### La Lb W E b2 a2 | | | | | | +-----------+ | | | | +-------+ | +------------+ | | +--------+ | | | | | | | | | +--+--+---------+ | | | | | | | | | | | +----------+--+ | | | | | | ####### | | ####### | | | ####### Triple Socket | | | # N # | | # F # | | | # F # | | +--#3] [4#-+ +---#3] [4#--+ | | +------#3] [4#------+ | | <# #> # # | | | # # | | +----#2]^[5#--------#2]^[5#----+ | | +----#2]^[5#----+ | | ! # # # # | | | # # | | +-+----#1]^[6#--------#1]^[6#------+ | | +--#1]^[6#--+ | | ! ! # # <# #> | | | <# #> | | | ! ! ####### ####### | | | ####### | | | ! ! +------------------------+-+-+-----------+ | | ! ! | +---------------------+-+-+-------------+ | ! ! | | +------------------+-+-+---------------+ ! ! | | | +---------------+ | | ! +---------+--+--+--+--+--------------+ | +-----------+--+--+--+--+--+-------------+ | | | | | | ###################### # 6 5 4 3 2 1 # Screw block ###################### | | ###### ######### ######### # 0 0 X X 0 0 # Western Socket ###################### =============================================================================== http://de.wikipedia.org/wiki/Telekommunikations-Anschluss-Einheit NFN: "Gängigste Variante. Vor die mittlere Buchse (F) sind beide N-Buchsen geschaltet." NF/F: Zwei a/b-Anschlüsse, für zwei unabhängig beschaltete F-Geräte, vor die mittlere (F-)Buchse ist eine N-Buchse geschaltet =============================================================================== NFN TRIPLE SOCKET as installed by D.Telekom Munich 1993 (sleek socket) ###################### 1: 0V Plain Line # 1 2 3 4 5 6 # 2: +56V Dashed ###################### Terminator ###################### Package # 1 2 3 4 5 6 # ###################### | | +--------- - - ------ | | Broken Link | _+_ | +-------+ | \ / +-------+ +470K +---------------+ -+- +-------+ | | Diode: PH13D ~800 ohm @ ~5V | +----------------------------------+ ###################### Screw Block # 1 2 3 4 5 6 # ###################### La Lb W E b2 a2 | | | | | | +-----------+ | | | | +-------+ | +------------+ | | +--------+ | | | +-------------+ | | | | | | +--+--+---------x-+-+----------------+ | | | | +------------+-+-+----+ | | | | | | | | | | | | | | ####### | | ####### | | | | ####### | | | | # N # | | # F # | | | | # N # | | | +--#3] [4#-+ \----#3] [4#-+ | | +--#3] [4#--+ | | <# #> # # | | <# #> | +----#2]^[5#---+ +---#2]^[5#---+ | +---#2]^[5#---+ | # # | | # # | | # # | +------#1]^[6#-\ | | +-#1]^[6#-----+ | +-#1]^[6#-+ | # # | | | | <# #> | | # # | | ####### | | | | ####### | | ####### | | | | | +-----------------+-+---------+ | | | +-------------------+-+-----------+ | +---------------------+ | +-------------------------+ 'x' above is an assumed correction from '-' 2017-01 =============================================================================== NFN TRIPLE SOCKET (Ugly) as installed by D. Telekom 1995 With label >ABS< on front, & label >ABS< DBP T on back ###################### 1: 48V Red Line # 1 2 3 4 5 6 # 2: 0V Blue ###################### No removable Terminator Pack (cable push fit, so nowhere to screw in terminator) ###################### IDC Block # 1 22 33 4 5 6 # 8 connectors: 2 for #2 & #3 ###################### | | | | | | +-----------+ | | | | +--------+ | +------------+ | | +---------+ | | | +-------------+ | | | | | | +--|--+----------+-+-+--------------+ | | | | +-------------+-+-+---+ | | | | ####### | | ####### | | | | ####### | | | | # N # | | # F # | | | | # N # | | | +--#3] [4#-+ +-----#3] [4#-+ | | +--#3] [4#-+ | | <# #> # # | | <# #> | +----#2]^[5#---+ +----#2]^[5#---+ | +---#2]^[5#---+ | | # # | | # # | | # # | +-+----#1]^[6#-+ | | +--#1]^[6#-----+ | +-#1]^[6#-+ | | | # # | | | | <# #> | | # # | | | | ####### | | | | ####### | | ####### | | | | | /| | | | +-----------------+-+---------+ | | +--|< |-| | | +-------------------+-+-----------+ | | \| | | | | | | ____ | | +---------------------+ | +--|____|-+ +-------------------------+ Diode: 460K @ .12V, Resistor 470K No diode or resistor on socket bought in Aachen Jan 2000. Socket leaflet says power off devices before sticking in socket. =============================================================================== Aachen from memory 2017-01, Wall, Left to right: N Fall Alert Caller gone @ 2017 F Phone (Radio linked DECT) N Anwerphone & Fax Munich 2024-12 My Fritz DSL used just 2 wires Aachen 2024-12 NFN in Front room has Fritz DSL running at reduced speed, reporting 2 unwanted spurs. socket has Left to right 1 red + white, white disconnected 2024-12-29 2 black 3 yellow, yellow disconnected 2024-12-29 4 No wire 5 No wire 6 No wire =============================================================================== F plug to NFN TRIPLE SOCKET (Beveled 45 deg. corners) 2017-02 Labelled AAC/JHS before later sending to Aachen for TV silencer. ####### Plug # F # +--#3] [4#--+ | # # | +--+--#2] [5# | | | # # | +--+--+--#1] [6# | | | | <# #> | | | | ####### | | | | +--------+ | | | | ###################### Soldered # 1 2 3 4 5 6 # ###################### | | | | +-----------+ | | | | +------------+ | | | | +-------------+ | | | | | | | | | +--+--+----------+----------------+ | | | | | | | | | | | +-------------+----+ | | | | ####### | | ####### | | ####### | | | | # N # | | # F # | | # N # | | | +--#3] [4#-+ +-----#3] [4#-+ +---#3] [4#-+ | | <# #> # # <# #> | +----#2]^[5#---+ +----#2]^[5# +---#2]^[5#---+ | # # | | # # | # # | +------#1]^[6#-+ | | +--#1]^[6# | +-#1]^[6#-+ | # # | | | | <# #> | | # # | | ####### | | | | ####### | | ####### | | | | | +---------------+-+---------+ | | | +-----------------+-+-----------+ | | | | | +-------------------+ | +-----------------------+ =============================================================================== Tevion ARB781 Answerphone booklet P. 22 says if an NFN socket, use rightmost N. =============================================================================== Philips Fax @ A&R P.8 says use left N, avoid adaptors, distributors, extenders. From another extension, *5 Start fax reception. If picked up phone & then realise its a fax: ** Stop fax reception. If on phone, then fax starts (maybe time delayed transmit). =============================================================================== I used to have -ve on pin 1 on MK@ Munich POTS line & on My 6 digit POTS original line, so I swopped my 7 digit fax line to same MK@ & JHS@ POTS lines had ~56V, my 7 digit fax line less. =============================================================================== German non public plug, large size, ~2cm wide, to Phone With Meter As installed by DT contracted technician. | | Telekom Cable, to a & b | | ###### | W = Wecker = Bell, E = Erd = Earth ##### ##### # E W b a # Socket (non public type) ############## ###### ##### ##### # 4 3 2 1 # Plug (non public type) to phone with meter ############## | | | | | | 4=Unused, 3=Green, 2=Brown, 1=White. Dial Tone between 1 & 2 ------------------------------------------------------------------------------- German Phone (F) Plug to German Plug (non public, large size, ~2cm wide) Cable purchased by JHS@: ####### Plug # F # +--------#3] [4#--+ | # # | | +-----#2] 5# | (secondary color would be brown) | | # # | | | +--#1] 6# | (secondary color would be green) | | | <# #> | | | | ####### | | | | | +--+--+--+-----------+ | | | | | ###### | ##### ##### # 4 3 2 1 # Plug ############## 4=Yellow, 3=Green, 2=Brown, 1=White. =============================================================================== ISDN: NTBA-TK & NTBA-PC cables are 4 wire straight. There's about 97V on my ISDN line, whether or not the NTBA is connected. (I am suprised, I thought phones worked at 50, I must check that JJLATER). My black 7 way S0 block has all 7 sockets wired identically, with a 100 ohm between outer conductors, & another 100 ohm between inner 2 conductors. (Bought from Hartnagel in green cardboard box) Up to 150m total length, with up to 8 taps along the way, with a maximum tap length of 1m, or alternatively up to 800m with no taps. =============================================================================== For DSL Spliters See Also http://www.berklix.com/~jhs/src/bsd/jhs/bin/public/phone/routers.html