Connecting To A Telephone - Cisco LRE CPE Hardware Installation Manual

Connecting to a Telephone

Connecting to a Telephone
Cisco LRE CPE Hardware Installation Guide
2-24
These limitations and restrictions apply when you use a plain old telephone
service (POTS) splitter with the Catalyst 2950 LRE switches and Cisco LRE CPE
devices:
The Catalyst 2950ST-8 LRE switch, Catalyst 2950ST-24 LRE switch,
•
Cisco 575 LRE CPE, and Cisco 585 LRE CPE are designed to share lines
with analog, Integrated Services Digital Network (ISDN), and digital private
branch exchange (PBX) switch telephones that use the 0 to 700 kHz
frequency range.
Digital telephones connected to digital PBX switches that use frequencies
above 700 kHz do not work when sharing a line with LRE signals. Due to the
proprietary nature of digital PBX switches, some digital PBX switch services
use frequencies above 700 kHz.
• You can use a Cisco LRE 48 POTS Splitter with a Catalyst 2950ST-8 LRE
switch, Catalyst 2950ST-24 LRE switch, Cisco 575 LRE CPE, and Cisco 585
LRE CPE. For installation instructions, refer to the Installation and Warranty
Notes for the Cisco LRE 48 POTS Splitter.
The Catalyst 2950ST-24 LRE 997 switch and Cisco 576 LRE 997 CPE are
•
designed to share lines with analog and ISDN telephones that use the 0
to 120 kHz frequency range.
We recommend that you do not use a Cisco LRE 48 POTS Splitter with a
•
Catalyst 2950ST-24 LRE 997 switch and a Cisco 576 LRE 997 CPE as shown
in Figure 2-10. Only traffic in a specific frequency range can be sent to and
from the devices attached to the CPE.
In Figure 2-10, only traffic from 0 to 120 kHz can pass from a device attached
to the CPE, such as a computer or telephone, to the CPE, a splitter, and a
switch. In the reverse direction, traffic from 0 to 700 kHz can pass through
the switch and splitter to the CPE, but only traffic from 0 to 120 kHz can pass
through the CPE to a computer or a telephone.
For more information, refer to the Installation and Warranty Notes for the
Cisco LRE 48 POTS Splitter.
Chapter 2 Installation
78-11469-04