Starfish Systems
www.starfishsystems.ca
(604) 916-7871
|
|
Starfish Systems
www.starfishsystems.ca
(604) 916-7871
|
||
| Services | Software | Community | About Us |
| Hardware |
|
Serial Cabling |
|
|
Network Cabling |
| Serial Cabling |
|
It looks like the EIA-232 serial interface, in all its variants, is going
to be with us for some time yet.
Adapters such as the ones shown below provide an extremely versatile
way to build the entire range of EIA-232 connector combinations around
one conventional RJ-45 network cable.
With a relatively small collection of these adapters, the entire population
of EIA-232 connector variants becomes available.
Of course if the RJ-45 connector is used to deliver the signals directly, then its pin assignments themselves would become significant. And it turns out that there is more than one convention for RJ-45 serial signals. I describe two competing conventions in the tables below. It may therefore prove wise to carry a few unassembled adapters to deal with rare combinations. It's still better than to carry a different cable for every possible adapter combination! |
| Unicom Electric | Newark | Description |
| DEM-45F | 50F9356 | Jack Adapter, D-Sub 9 Female to 8-Wire RJ-45 |
| DEM-45M | 50F9357 | Jack Adapter, D-Sub 9 Male to 8-Wire RJ-45 |
| DAM-45F | 50F9360 | Jack Adapter, D-Sub 15 Female to 8-Wire RJ-45 |
| DAM-45M | 50F9361 | Jack Adapter, D-Sub 15 Male to 8-Wire RJ-45 |
| DBM-45F | 50F9364 | Jack Adapter, D-Sub 25 Female to 8-Wire RJ-45 |
| DBM-45M | 50F9365 | Jack Adapter, D-Sub 25 Male to 8-Wire RJ-45 |
DB-25 / RJ45 |
"Use of ANSI/EIA-232-D with 8 position Modular Connector"
Bulletin TBS-25 edited in Feb 89 by the Electronic Industries Association "Ready Start" configuration |
RJ45 DB-25 Shell Signal 1 6 blue DSR 2 8 orange DCD 3 20 black DTR 4 7 red GND 5 3 green RXD 6 2 yellow TXD 7 5 brown CTS 8 4 white RTS
DB-25 / RJ45 |
"Netra t1 User and Administration Guide"
Sun Microsystems Part No. 806-4707-10, June 2000, Revision A crossover connector also suitable for Cisco L2511 Terminal Server |
RJ45 DB-25 Shell Signal 1 5 blue RTS/CTS 2 6 orange DTR/DSR 3 3 black TXD/RXD 4 7 red GND 5 7 green GND 6 2 yellow RXD/TXD 7 20 brown DSR/DTR 8 4 white CTS/RTS
DB-9 / RJ45 |
IBM/AT Style RS-232 Interface
following same interpretation as Bulletin TBS-25 above |
RJ45 DB-9 Shell Signal 1 6 blue DSR 2 1 orange DCD 3 4 black DTR 4 5 red GND 5 2 green RXD 6 3 yellow TXD 7 8 brown CTS 8 7 white RTS
DB-9 / RJ45 |
"Netra t1 User and Administration Guide"
Sun Microsystems Part No. 806-4707-10, June 2000, Revision A crossover connector also suitable for Cisco L2511 Terminal Server |
RJ45 DB-9 Shell Signal 1 8 blue RTS/CTS 2 6 orange DTR/DSR 3 2 black TXD/RXD 4 5 red GND 5 5 green GND 6 3 yellow RXD/TXD 7 4 brown DSR/DTR 8 7 white CTS/RTS
| Network Cabling |
| The IEEE 802.3 Ethernet standard for twisted pair specifies the same RJ-45 pin assignment for 10baseT, 100baseT, and 1000baseT. All use two wire pairs, one for transmit and one for receive. Crossover cables exchange the positions of these two pairs. Color conventions differ between solid and stranded wire cables. Be aware also that modular crimp connectors are different for solid and stranded wire. |
RJ45
|
"ANSI/EIA/TIA-568-1991 Commercial Building Telecommunications Wiring Standard"
also called AT&T specification, previously called 258A stranded colors per "NorTel Digital Patch Cable" |
RJ45 Solid Stranded Signal 1 white/orange yellow TxD + 2 orange black TxD - 3 white/green blue RxD + 4 blue green 5 white/blue red 6 green orange RxD - 7 white/brown brown 8 brown gray
RJ45 Solid Stranded Signal 1 white/green blue RxD + 2 green orange RxD - 3 white/orange yellow TxD + 4 blue green 5 white/blue red 6 orange black TxD - 7 white/brown brown 8 brown gray
|