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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 1 Overview
Network Configuration Examples
Note All telephones not directly connected to the hotel room CPE device require microfilters with a 300-ohm
termination. Microfilters improve voice call quality when voice and data equipment are using the same
telephone line. They also prevent nonfiltered telephone rings and nonfiltered telephone transitions (such
as on-hook to off-hook) from interrupting the Ethernet connection.
Through a patch panel, the telephone line from each room connects to a nonhomologated POTS splitter,
such as the Cisco LRE 48 POTS Splitter. The splitter routes data (high-frequency) and voice
(low-frequency) traffic from the telephone line to a Catalyst 2950 LRE switch and digital private branch
exchange (PBX). The PBX routes voice traffic to the PSTN.
If a PBX is not on-site, a homologated POTS splitter is required to connect directly to the PSTN.
Note Consult the regulations for connecting to the PSTN in your area.
If a connection to a phone network is not required at all, a splitter is not needed, and the switch can
connect directly to the patch panel.
Note Cisco LRE products can share lines with analog telephones, Integrated Services Digital Network (ISDN)
telephone network, and PBX switches that use the 0 to 700 kHz frequency range.
Data to and from the room devices (such as e-mail for the laptop and IP multicast traffic for the
television) are transferred through the LRE link, which is established between the CPE RJ-11 wall port
and the LRE port on an LRE switch. The upstream and downstream rates on the LRE link are controlled
by a profile configured on each LRE port. If the LRE switch was connected to the PSTN through a
homologated POTS splitter, all LRE ports would use an ANSI-compliant LRE profile named
LRE-998-15-4.
The Catalyst 2950 LRE switches are cascaded through their 10/100/1000 switch ports. Each switch also
has a 10/100/1000 connection to an aggregation switch, such as a Catalyst 3550-12G switch. The
aggregation switch can connect to these devices:
• Accounting, billing, and provisioning servers
• A router that provides Internet access to the premises
You can manage the switches as a switch cluster and through Network Assistant. You can also manage
and monitor the individual CPE devices from the LRE switches to which they are connected. The
Catalyst 2950 LRE switch ports support the same software features as 10/100/1000 switch ports. For
example, you can configure port-based VLANs on the LRE ports to provide individual port security and
protected ports to further prevent unwanted broadcasts within the VLANs.
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