Cisco 2900 - Catalyst Expansion Module, Руководство по установке оборудования, Страница: 83 / 162

2-39
Catalyst 2900 Series XL Hardware Installation Guide
78-6461-04
Chapter 2 Installation
Connecting to an LRE Port
If telephone services, such as voice or integrated services digital network (ISDN),
use the same cabling as LRE traffic, you must connect the LRE to a
plain old
telephone service (POTS) splitter.
Note Cisco LRE products 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. [CSCdu73260]
Note If no other telephone services travel on the same wiring as LRE traffic, the LRE
switch connects directly to a patch panel.
Connecting the LRE port to a patch panel or POTS splitter requires a
male-to-male RJ-21 cable, Category 3 or above. You can order RJ-21 cables from
your cable vendor, or you can order these cables from your Cisco sales
representative:
•
CAB-5-M120M120-5= (Category 5 cable with 90-degree, male-to-male
RJ-21 connectors)
•
CAB-5-M180M120-5= (Category 5 cable with 120-degree, male-to-male
RJ-21 connectors)
The screws you need to secure the cable to the switch are shipped with the cable.
Contact your Cisco sales representative for more information.
To connect the LRE port to a patch panel or POTS splitter, follow these steps:
Step 1
Connect one end of a wiring trunk cable to the RJ-21 connector of the LRE port
on the switch. (See
Figure 2-30 .)