Path: ucbvax!hplabs!sdd.hp.com!decwrl!pa.dec.com!reid
From: reid@pa.dec.com (Brian Reid)
Newsgroups: comp.dcom.telecom.tech
Subject: Re: RJ48?
Message-ID: <2ejo72$ie6@usenet.pa.dec.com>
Date: 14 Dec 93 06:58:42 GMT
References: <2ejame$gm2@juniper.almaden.ibm.com>
Organization: DEC Network Systems Laboratory
Lines: 109
NNTP-Posting-Host: torrey.pa.dec.com
In article <2ejame$gm2@juniper.almaden.ibm.com> enge@almaden.ibm.com writes:
>Can someone tell me what RJ-48 is.
I am holding in my hand a modular cable marked RJ48. It has the following
pinout on an RJ45 connector:
Station
Pin no. Wire
----------------------------------------
1 T2
2 R2
3 open
4 open
5 open
6 open
7 T1
8 R1
------------------------------------------------------------------------------
If you renumber the two pairs to be 2 and 4 instead of 1 and 2, this is the
same pinout as pairs 2 and 4 of a 258A connector.
------------------------------------------------------------------------------
------------------------------------------------------------------------------
Here are my notes, assembled from various sources over the years, on modular
connector pinouts.
------------------------------------------------------------------------------
Modular Connector and station wiring.
4-pin RJ11 jacks are wired so that the center two conductors are pair 1 and
the outer two conductors are pair 2. There are two kinds of cables: those
that reverse the pairs and those that don't.
Hold a modular socket so that the pins are vertical and you are looking down
the hole along the axis into which a jack would be inserted. Make sure the
straight edge is at the left and the slot for the locking pin is at the right.
The pins, which should run evenly down the left edge of the hole you are
staring into, are numbered 1-4, 1-6, or 1-8 from bottom to top.
Standard 4-pin RJ11 voice connectors have the following pinout (wire 1 at the
bottom when looking down into the jack)
Station
Pin no. Wire
----------------------------------------
1 Black T2
2 Red R1
3 Green T1
4 Yellow R2
Standard 8-pin USOC RJ45 commercial voice wiring connectors have the following
pinout (remember wire 1 is at the bottom)
Station
Pin no. Wire
----------------------------------------
1 Blue R4
2 Orange T3
3 Black T2
4 Red R1
5 Green T1
6 Yellow R2
7 Brown R3
8 White T4
8-pin "258A" Data wiring connectors (used for commercial installations
that have DDS or ISDN) is the AT&T Premises Distribution System
pinout standard. It is also usable for 10BaseT according to IEE 802.3.
Station
Pin no. Wire
----------------------------------------
1 Blue T2
2 Orange R2
3 Black T3
4 Red R1
5 Green T1
6 Yellow R3
7 Brown T4
8 White R4
10BaseT industry standard
Station
Pin no. Wire
----------------------------------------
1 Blue T2
2 Orange R2
3 Black T3
4 Red open
5 Green open
6 Yellow R3
7 Brown open
8 White open
------------------------------------------------------------------------------
Cisco STS-10 terminal pinout (8-pin RJ45 connector)
1 Frame ground
2 RD in
3 DTR out
4 CTS in
5 RI in
6 Signal Ground
7 TD out
8 open