Gbic Module Ports - Cisco WS-C2950T-48-SI Hardware Installation Manual

Front-Panel Description
For limitations and restrictions when you use a POTS splitter with the Catalyst 2950 LRE switches and
Cisco LRE CPE, see the
If the installation does not have a PBX, a certified, homologated POTS splitter is required to connect
directly to the PSTN. For more information about homologated POTS splitters, contact your Cisco sales
representative.
If a connection to a telephone network is not required, a splitter is not needed, and the switch can connect
directly to the patch panel.
For more information about the Cisco LRE CPE devices, see the Cisco LRE CPE Hardware Installation
Guide.

GBIC Module Ports

The GBIC module slots support these modules:
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Note Cisco-approved CWDM GBIC modules have a serial EEPROM that contains the module serial number,
the vendor name and ID, a unique security code, and cyclic redundancy check (CRC). When a GBIC
module is inserted in the switch, the switch software reads the EEPROM to check the serial number,
vendor name, and vendor ID and recomputes the security code and CRC. If the serial number, the vendor
name or ID, security code, or CRC is invalid, the switch places the interface in an error-disabled state.
If you are using a non-Cisco approved CWDM GBIC module, remove the module from the switch, and
Note
replace it with a Cisco-approved module.
For more information about these GBIC modules, see your GBIC module documentation.
Catalyst 2950 Switch Hardware Installation Guide
1-10
"Limitations and Restrictions with POTS Splitters" section on page
1000BASE-SX GBIC module for fiber-optic connections that cannot exceed 1804 feet (550 meters).
1000BASE-LX/LH GBIC module for fiber-optic connections that cannot exceed 32,810 feet
(10 kilometers).
1000BASE-ZX GBIC module for fiber-optic connections that cannot exceed 328,100 feet
(100 kilometers).
1000BASE-T GBIC module for copper connections that cannot exceed 328 feet (100 meters).
CWDM GBIC module for single-mode fiber-optic connections that cannot exceed 393,719 feet
(120 kilometers).
GigaStack GBIC module for creating a 1-Gbps stack configuration of up to nine supported switches.
The GigaStack GBIC supports one full-duplex link (in a point-to-point configuration) or up to nine
half-duplex links (in a stack configuration) to other Gigabit Ethernet devices. Using the required
Cisco proprietary signaling and cabling, the GigaStack GBIC-to-GigaStack GBIC connection
cannot exceed 3 feet (1 meter).
Chapter 1 Overview
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