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HP 100VG-AnyLAN - Questions and Answers

ISSUE: What is 100VG-AnyLAN?
SOLUTION: 100VG-AnyLAN is a new network technology, the IEEE standard 802.12, which provides a data rate of 100 Mbit/s on 4-pair category 3, 4, and 5 unshielded twisted-pair (UTP) 2-pair shielded twisted-pair (STP), and fiber-optic cabling. It supports Ethernet/IEEE 802.3 and IEEE 802.5 frame formats, and uses Demand Priority protocol to control network access.

ISSUE: What is Demand Priority protocol?

SOLUTION: Demand priority is a priority based, round robin arbitration method where the hub regularly scans its ports to determine which have transmission requests pending. Transmission requests from the nodes may be normal priority (for example, for data files) or high priority (for example, for real-time voice, video, or data), and high priority requests are serviced before normal priority ones.

ISSUE: What are the maximum cable lengths for 100VG-AnyLAN?

Maximum Cable Length
4-pair Unshielded Twisted-Pair Category 3, 4
4-pair Unshielded Twisted-Pair Category 5
2-pair Shielded Twisted-Pair

ISSUE: What specifications must 100VG-AnyLAN cabling meet?

SOLUTION: The specifications are:
4-pair UTP:
EIA/TIA 568 standard or ISO/IEC DIS 11801 for 4-pair 100 ohm unshielded twisted-pair cable
2-pair STP:
EIA/TIA 568 standard or ISO/IEC DIS 11801 for 2-pair 150 ohm shielded twisted-pair cable
EIA/TIA 568 standard or ISO/IEC DIS 11801 for 2-fiber 62.5/125, multimode, graded-index, optical fiber cable
NOTE: If you presently have a 4-pair UTP cable network that complies with the Ethernet/IEEE 802.3 Type 10Base-T specifications, you can use the same cables for the HP 100VG network. Make sure that all 4 pairs are available and wired correctly.

ISSUE: Can you connect 100VG-AnyLAN to an existing 10 Mbit/s Ethernet or Token Ring network?

SOLUTION: Yes, you can connect a 100VG-AnyLAN network to an existing Ethernet or Token Ring network using a simple bridge. A router may be used to connect to FDDI and ATM backbones, and Wide Area Networks (WANs).

ISSUE: Is 100VG-AnyLAN compatible with existing Network Operating Systems (NOS) and applications?

SOLUTION: Yes, 100VG-AnyLAN supports Ethernet/IEEE 802.3 and IEEE 802.5 frame format and Medium Access Control (MAC) service interface to the Logical Link Control (LLC). All you need is the appropriate driver for your 100VG-AnyLAN network adapter card.

ISSUE: What HP 100VG products are available?

SOLUTION: The following HP 100VG products are available:
  • HP J2410A AdvanceStack 100VG Hub-15

  • HP J2414A 100VG SNMP/Bridge Module (An HP J2608A ThinLAN transceiver is shipped with the module)

  • HP J2573A 10/100VG ISA LAN Adapter

  • HP J2577A 10/100VG EISA LAN Adapter

  • HP J2585A 10/100VG PCI LAN Adapter

  • HP 100VG-AnyLAN/9000 for HP 9000 Series 700 EISA Systems with HP-UX Release 9.0X and HP-UX Release 10.0 (HP J2645AA and HP J2655AA)

ISSUE: How do I cascade HP 100VG hubs?

SOLUTION: To cascade two 100VG hubs, connect the uplink port of the lower-level hub to any one of the downlink LAN ports of the upper-level hub with a standard 4-pair UTP cable.

ISSUE: How many HP 100VG hubs can you cascade together?

SOLUTION: Up to five levels of cascading is supported. In fact, HP 100VG supports the same topology rules as a 10Base-T network, and more.

ISSUE: How do you connect an HP 100VG network and 10 Mbit/s Ethernet or IEEE 802.3 network?

SOLUTION: To connect a 100VG hub to a 10 Mbit/s network, the following accessory products are required:
  • HP J2414A SNMP/bridge module is installed in the expansion slot at the back of the hub.

  • One of the following transceiver modules is installed in the AUI/Xcvr slot in the front of the hub.

    • HP J2606A Fiber-Optic Transceiver for 10Base-FL

    • HP J2607A Twisted-Pair Transceiver for 10Base-T

    • HP J2608A ThinLAN Transceiver for 10Base2

    • HP J2609A AUI Port for external transceivers

The bridge module provides the bridge functionality between the 100 Mbit/s and 10 Mbit/s networks. The AUI/Transceiver modules provide the physical interface to the respective Ethernet/IEEE 802.3 network medium.

ISSUE: Does an HP 100VG hub count as a repeater in a 10Base-T network?

SOLUTION: To connect an HP 100VG hub to a 10Base-T network, the HP J2414A bridge module is required. This resets the repeater count.

ISSUE: Does HP 100VG use all 4 pairs of the UTP cable? What if you currently use 2 pairs for 10Base-T LAN and 1 pair for phone?

SOLUTION: Global Data Supply has 2 products, Phone Tamer PT100 (single line phone patch) and PT200 (dual line phone patch), which can be used at both ends of the UTP cable. This splitter enables 100VG and phone (analog) to run on the same cable simultaneously. They may be contacted at:
Global Data Supply
1280 Alma Court
San Jose, CA 95112

All questions about the Phone Tamer should be directed to Global Data Supply.

ISSUE: Where can you get additional technical information about 100VG-AnyLAN?

SOLUTION: The following are additional sources:
  • "Planning And Designing High Speed Networks Using 100VG-AnyLAN" by Janis Costa. Order from Prentice Hall (Call 515-284-6761), title code 16868-2, U.S. $24.00.

  • 100VG-AnyLAN Forum (Call 916-348-0212 or write to P.O. Box 1378, North Highlands, CA 95660.)

  • IEEE standard 802.12.

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Document title: HP 100VG-AnyLAN - Questions and Answers
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