Multi I/O cable NTRH0912
Used with 201i/202i servers, a multi I/O cable presents 2 network intefaces, and one RS-232 port, from an IPE slot 50-pin Amphenol (RJ-21). The standard cable is approximately 3 m (10 ft) long. If you need a longer length, use a RJ-45 female-to-female adapter to attach an additional CAT5 cable. A maximum length of 76 meters (250ft) is supported. Alternatively, you can use the pin diagram below to construct your own!
| Cable | Ring | RJ-21 | Tip | Cable |
|---|---|---|---|---|
| COM1 - 9 (RI) | 16 |  |
41 | COM1 - 1 (DCD) |
| COM1 - 2 (RXD) | 17 | 
| 42 | COM1 - 3 (TXD) |
| COM1 - 4 (DTR) | 18 | 
| 43 | COM1 - 5 (GND) |
| COM1 - 6 (DSR) | 19 | 
| 44 | COM1 - 7 (RTS) |
| COM1 - 8 (CTS) | 20 | 
| 45 | |
| ELAN - 3 (RX+) | 21 | 
| 46 | ELAN - 6 (RX-) |
| ELAN - 1 (TX+) | 22 | 
| 47 | ELAN - 2 (TX-) |
| CLAN - 3 (RX+) | 23 | 
| 48 | CLAN - 6 (RX-) |
| CLAN - 1 (TX+) | 24 | 
| 49 | CLAN - 2 (TX-) |
Construction Notes:
- Shield braid at amphenol connects to shields on COM1 & LANs
- COM1 is a shielded serial cable with male DB-9 end, its purpose is to connect to a modem for remote access.
- ELAN and CLAN are shielded ethernet cables with RJ-45 ends. Both have a ferrite bead on the RJ-45 end, and both go through a single ferrite bead at the amphenol end.
- If the modem port is not required: in lieu of an NTRH0912, simply cut the end off a network patch cable, and punch the Orange and Green pairs to RJ-21/BIX pairs 21 & 22 (ELAN), or 23 & 24 (CLAN).
- Shields and ferrite beads are your friends! They prevent RF interference both emanating from, and causing trouble to, your electronic devices. Shields also mitigate crashes due to electrostatic discharge.