Token Ring Cable

  If you find a mistake (God forbid!) please tell me

IBM Token-Ring RJ-45 STP Adapter cable IBM P/N 60G1063

A1 Connector, adapter end 8-position RJ-45 modular jack
A2 Connector, network end IBM Cabling System Data Connector

  This is used when the adapter has a DB9 port, and the MAU used ICS.

IBM Token-Ring UTP cable Two twisted pairs of UTP cabling.

B1 Connector, adapter end 8-position RJ-45 modular jack
B2 Connector, network end 8-position RJ-45 modular jack or 6 position RJ-11 modular jack

Token Ring - UTP Modular Connector

 RJ-45    to     RJ-45           RJ-45    to     RJ-11

  3 ------------- 3      TD-      3 ------------- 2
  4 ------------- 4      RD+      4 ------------- 3
  5 ------------- 5      RD-      5 ------------- 4
  6 ------------- 6      TD+      6 ------------- 5

1,2,7,8         1,2,7,8         1,2,7,8           1,6  <-- Not used

  This cable is used when the adapter is RJ45 (or you use a Media Filter) and the Media Access Unit (MAU) is UTP also.

IBM RJ-45 STP/D-Shell Conversion Cable  IBM P/N 60G1066
   Supplied for use with IBM Token-Ring Network PC Adapter cables

C1 Connector, adapter end 8-position RJ-45 modular plug
C2 Connector, network end 9-position D, male

  This adapter plugs into the RJ45 port on the adapter and mechanically changes the cable type to STP for use with the IBM ICS cables.

IBM Token Ring Network PC Adapter Cable (STP cable) IBM P/N 6339098

D1 Connector, adapter end 9-position D, male
D2 Connector, network end IBM Cabling System Data Connector or equivalent

  These cables are used with adapters that use a DB9 port. For adapters with RJ45 and DB9 ports, the setup gives you the choice of STP (Shielded Twisted Pair, which is the IBM ICS cabling) or UTP (Unshielded Twisted Pair, or Cat3/Cat5 wiring)

IBM Ring In/Ring Out STP Cable

E1 Connector, Multistation Access unit end IBM Cabling System Data Connector
E2 Connector, Multistation Access unit end IBM Cabling System Data Connector

 These are true hermaphrodite cables, used to link 8228 MAUs together to form a ring. Each ring adds another 8 data ports to the Token Ring network. I have seen short 1ft, 3ft, and 6ft and longer cables.. 


From Peter
>If I have two MAUs connected RI <-> RO  and there are machines connected to both and then I disconnect the MAUs, can I later reconnect them and get all the machines to see other again?

No. Normally not. Depends on if you manage to disconnect the RI/RO cable from both MAUs almost simultanously before the TR adapter(s) connected to them get a "Token Lost" time-out and shut down the ring interface. From the moment you separate the two MAUs one adapter on each becomes "ring monitor", because you have two separate rings at that time. When you reconnect the two rings there are *two* tokens and two active ring monitors in one ring. It takes some time
until the negotiation is done which adapter stays ring monitor (or which *other* adapter takes over) and to re-circulate the two concurring tokens on the ring. 

>I have a server connected to one MAU which can't see any machines connected to the other. I don't want to reboot this server. How do I get everything working again properly?

If the server cannot see other machines it is a protocol error on the server most likely ... so what's the use to kick of the *other* machines then ? You will need to reboot the server at one point anyway - so why fussing around with the entire ring.

Question 1: do you see any other station on the entire ring anyway (e.g. Machine A on MAU-1 sees a Machine B on MAU-2) or isn't there any sort of communication across the two MAUs at all ?

Question 2: which protocol are you using ? TCP/IP ?
I - for example - have a Linux intranet server, that does not show up under "Network Neighborhood" - but the shared ressources (under SAMBA) can be used with NET USE X: \\I-SERVER\I-DRIVE from any station in the network. It is running TCP/IP only, but not IPX/SPX or NETBEUI .... which are required under Winblowz to use the "direct name" ("Find Computer") without having a "hosts" file with the list IP-Adress = Name.

Media Filters

Stuffer Box

Body Assemply


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