A. Name: Use of Ethernet repeaters at PennNet wallplates
B. Number: 19991022-repeater
C. Author(s): D.Kassabian, M.Wehrle, K.Victoreen, M.Levinson (ISC Networking)
[ ] proposed [ ] under review [ ] approved [ ] rejected [ X ] obsolete
E. Date proposed: 1999-06-30
F. Date revised: 2007-04-10
G. Date approved: 1999-10-22
H. Effective date: 1999-10-22
Policy on Use of Ethernet Switches at PennNet wall plates, located at http://www.net.isc.upenn.edu/policy/approved/20030922-switch.html
Policy on Routing Devices Connected to PennNet, located at http://www.net.isc.upenn.edu/policy/approved/20030310-routing.html
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II. Authority and Responsibility
Information Systems and Computing's Networking organization is responsible for the operation of PennNet (Penn's data networks) and therefore has the authority and responsibility to specify requirements for any devices connecting to PennNet. This authority extends to the device type in the case of networking electronics such as a router, repeater, or switch. It also extends to certain configuration parameters of a device which could adversely impact other parts of the network.
III. Executive Summary
This policy specifies the conditions under which an Ethernet repeater may be connected to a PennNet wallplate, and refers to a list of eligible locations. It also provides "best practice" recommendations to guide the network user in deploying repeaters appropriately.
The purpose of this policy is to identify the locations and circumstances in which an Ethernet repeater may be connected to a PennNet wallplate. While multiport Ethernet repeaters can be convenient in providing access to multiple networked devices in locations where only one PennNet wallplate port is available, use of repeaters in certain situations can cause significant problems (see V. Risk of Non-compliance). This policy allows the network user to take advantage of the convenience of multi-port repeaters in cases where doing so will not adversely affect the provision of network service to others.
V. Risk of Non-compliance
This policy applies to any device acting as an Ethernet repeater, including wireless devices acting as an Ethernet repeater. An Ethernet repeater (also called a repeating hub or concentrator) is a device that repeats, retimes and/or reshapes a signal received on one port, sending it to all other ports. This policy does not apply to hubs which perform a bridging or switching function.
Restrictions on the use of Ethernet repeaters apply to all standard PennNet wallplates. Network wallplates that are provided and supported by organizations other than the University's central networking organization are not covered directly by this policy. Network users are advised to check with their local LSP if uncertain.
VII. Statement of policy
The use of Ethernet repeater devices to connect computers, printers, and other networked items to a PennNet wallplate is permitted only in buildings that have been certified by ISC Networking as "repeater ready". The official list of "repeater ready" buildings can be found at
In buildings that are "repeater ready," the following limitations apply to the use of Ethernet repeaters:
VIII. Recommendations and Best Practices
The following related practices are strongly recommended by ISC Networking, towards a more efficient network.
A. Verification: ISC Networking does not plan to actively police the network in an effort to discover non-compliant repeater devices, but will act on those discovered during the normal course of events in operating and/or troubleshooting the network.
B. Notification: Notification shall be made to the LSP for the area. Whenever possible and practical, the user of the repeater-connected node(s) will also be notified.
C. Remedy: Remedy will be the immediate removal of out-of-compliance repeaters. Interim solutions to retain connectivity may in many cases be available through ISC Networking.
D. Financial Implications: The network user will be responsible for the costs of any new port activation or new wiring, and any costs for interim solutions where applied.
E. Responsibility: Responsibility for remedy (and associated costs) lies with the network user. In the vast majority of cases, the area LSP will have involvement in the implementation of the remedy.
F. Time Frame: Non-compliant connections must be remedied immediately to reduce risk of networking failures for other network users. Interim solutions, which may involve having the network user rent ISC-owned equipment, should be made available by ISC Networking (where possible and with the cooperation of the network user) within 2 business days to allow the network user to continue to receive service. Final solutions should be implemented within 30 days.
G. Enforcement: Please see the Policy on Computer Disconnection from PennNet at http://www.upenn.edu/computing/policy/disconnect.html
H. Appeals: Please see the Appeals section of the Policy on Computer Disconnection from PennNet at http://www.upenn.edu/computing/policy/disconnect.html