From: CRDGW2::CRDGW2::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX" 8-AUG-1990 22:53:31.66 To: MRGATE::"ARISIA::EVERHART" CC: Subj: DESPR/DELNI problem Received: by crdgw1.ge.com (5.57/GE 1.70) id AA05863; Wed, 8 Aug 90 12:22:33 EDT Received: From ugw.utcs.utoronto.ca ([128.100.100.3]) by CRVAX.SRI.COM with TCP; Wed, 8 AUG 90 07:08:40 PDT Received: from KRDC.INT.Alcan.CA (stdin) by ugw.utcs.utoronto.ca with BSMTP id 57667; Wed, 8 Aug 90 10:05:25 EDT Date: Wed, 8 Aug 90 10:03:00 EDT From: Shawn Allin - Alcan KRDC Computer Services Subject: DESPR/DELNI problem To: stodola@fccc.EDU, INFO-VAX@KL.SRI.COM Message-Id: <51E1DCE96E3FE004B2@KRDC.INT.Alcan.CA> X-Envelope-To: stodola@fccc.EDU, INFO-VAX@KL.SRI.COM X-Vms-To: IN%"stodola@fccc.edu",IN%"info-vax" Date sent: 8-AUG-1990 09:59:30 Hi, In response to Robert Stodela's problem concerning his DESPR/DELNI configuration problem, I am sending an article I found on DSIN when we had exactly the same problem. The short answer is that you have to put thin wire repeaters (Dec's anyways) on separate transceivers with heartbeat (SQE) disabled. Here is the article: 1 [DECNET-VAX] Nonheartbeat Transceiver Required in LAN DELNI/DEMPR Setu COPYRIGHT (c) 1989 by Digital Equipment Corporation. ALL RIGHTS RESERVED. No distribution except as provided under contract. LAYERED PRODUCT or COMPONENT: THINWIRE LAN OP/SYS: VMS VER_4.X LAST TECHNICAL REVIEW: 10-FEB-1988 17:28 SOURCE: Customer Support Center/Colorado Springs USA SYMPTOM: A DELNI/DEMPR ThinWire combination is connected to an Ethernet LAN. Communication from nodes on the DEMPR to nodes on the DELNI do not work. But nodes on the DEMPR can communicate to nodes on the ETHERNET backbone and the same for nodes on the DELNI. The only lack of communication is local to those nodes on the DELNI/DEMPR combination. ANALYSIS: DELNI/DEMPR ThinWire configurations do not require heartbeat. In this scenario the H4000 connecting the DELNI to the ETHERNET backbone is providing heartbeat. SOLUTION: The DELNI/DEMPR combination requires a transceiver without heartbeat. The Digital H4000-BA is the transceiver that provides this functionality. Installation of a nonheartbeat transceiver with the DELNI/DEMPR combination should resolve this problem. 2 [DECNET-VAX] DELNI/DEMPR ThinWire Configuration Guidelines COPYRIGHT (c) 1989 by Digital Equipment Corporation. ALL RIGHTS RESERVED. No distribution except as provided under contract. LAYERED PRODUCT or COMPONENT: LAN OP/SYS: VMS 4.X ALL THINWIRE SYSTEMS LAST TECHNICAL REVIEW: 10-FEB-1988 17:07 SOURCE: Customer Support Center/Colorado Springs USA SUBJECT: ThinWire Ethernet DELNI/DEMPR configuration guidelines. DESCRIPTION: When a DEMPR/DELNI combination is used heartbeat must be disabled. The H4000-BA can be ordered which does not have heartbeat or an H4000 can be modified as per FCO #FA-04744-01 to disable heartbeat. The following are 3 standard configurations: 1. base band Ethernet---------*****------------------ | transceiver with or without heartbeat | DEMPR (up to 8 coaxial segments can attach to DEMPR) 2. base band Ethernet---------****---------------------------------------- | transciever without hearbeat DELNI | (up to 8 DEMPRs connected to DELNI) | DEMPR (up to 8 coaxial segments can attach to DEMPR) 3. (loop back connector on global port) (see note 1 below) DELNI | (up to 8 DEMPRs connected to DELNI) | DEMPR (up to 8 coaxial segments can attach to DEMPR) Note 1: This needs more discussion. In order to get a standalone DELNI to work with DEMPRs the DELNI must be set in GLOBAL mode with a loop back connector on the global port (H3278 or P/N 12-22196-01). The reason the DELNI can not be put into LOCAL mode is because the DELNI would then provide its own heartbeat. Note 2: NonThinwire VMS systems do not require heartbeat. Therefore in the above configurations it is legal to mix Thinwire and nonThinwire systems. At present if a nonThinwire system is attached to a nonheartbeat transceiver the NCP LINE COUNTER COLLISION DETECT CHECK FAILURE will increment, however this does not indicate a problem. Cheers, Shawn Allin Alcan International Ltd., P.O. Box 8400, Kingston, Ont., Canada K7L 5L9 (613) 541-2178 ACCESS@KRDC.INT.Alcan.CA Bitnet: ACCESS@ALCANKTN