A–2
DECbridge 500/600 Series Problem Solving
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Port 1 of a DAS bridge has an A and a B connector that allows the bridge to
be connected directly to the FDDI network. Port 1 (A) connects to the incom-
ing Primary ring and the outgoing Secondary ring of the FDDI dual ring. Port
1 (B) connects to the outgoing Primary ring and the incoming Secondary ring
of the FDDI dual ring.
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Bridge-to-FDDI connections can be either multimode or single-mode, de-
pending on the model. The maximum cable length for multimode connections
is 2 kilometers (6561 feet). The maximum cable length for single-mode con-
nections is 40 kilometers (24.8 miles). If the connection is made through a
patch panel, the total cable length must not exceed this maximum length.
Single-mode connections must have a minimum optical power loss of 12 dB.
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For additional information and guidelines on fiber optic cable plants, refer to
the DECconnect System Fiber Optic Installation guide and DECconnect Sys-
tem Fiber Optic Planning and Configuration guide.
A.3 Bridge-to-802.3/Ethernet Guidelines
DECbridge 500 series units can be connected to an IEEE 802.3/Ethernet network
through either an AUI interface or a ThinWire interface. DECbridge 600 series units
can be connected to three individual IEEE 802.3/Ethernet network segments
through three separate AUI interfaces.
A.3.1 AUI Interface
The following rules and guidelines are for connecting the bridge to an IEEE
802.3/Ethernet network via the AUI interface:
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If the bridge connects to an IEEE 802.3 transceiver such as the H4005 or to a
DESTA, the transceiver cable must be an IEEE 802.3-compliant transceiver
cable (BNE3H/K/L/M or BNE4C/D).
•
If the bridge connects to a non-IEEE 802.3 transceiver such as the H4000, the
transceiver cable can be either Ethernet or IEEE 802.3 compliant.
•
IEEE 802.3 transceiver cables and Ethernet transceiver cables cannot be in-
terconnected.
