Cabling and Specifications

The following SFP module options are available for a Gigabit Ethernet line card:

•GLC-SX-MM—Short wavelength SFP module (850 nm nominal), for use in 1000BASE-SX links.

•GLC-LH-SM—Long-haul or long-wavelength SFP module (1310 nm nominal), for use in 1000BASE-LX links.

•GLC-LX-SM—Single-mode, long-reach

•GLC-ZX-SM=—Single-mode, extended-reach (supported by 4-Port Gigabit Ethernet ISE line card only)

The SFP modules have LC connectors. Different SFP module options allow you to customize the physical interfaces on the line card by using both types of modules on the same line card. The only restriction is that each port must match the specifications on the other end of the cable (short or long wavelength), and must not exceed the recommended cable length for reliable communication.

Fiber-optic transmission specifications identify two types of fiber: single-mode and multimode. The maximum distance for single-mode installations is determined by the amount of light loss in the fiber path. If your environment requires the light to travel close to the typical maximum distance, you should use an optical time domain reflectometer (OTDR) to measure the power loss.

Table 13 describes the operating parameters for the supported SFP modules.

Table 13 Gigabit Ethernet SFP Module Power Budget and Signal Requirements

 

 

Power

Transmit

Receive

Receive

Typical Maximum

SFP

Transceiver

Budget

Power

Power

Sensitivity

Distance

 

 

 

 

 

 

 

GLC-SX-MM

Short wavelength

7.5 dB

1

–17 to 0 dBm

–17 dBm

984 feet (300 meters)

–9.5 to -4 dBm

 

Multimode,

 

at 850 nm2

 

 

 

 

 

 

 

 

 

 

short haul

 

 

 

 

 

 

 

 

 

 

 

 

GLC-LH-SM3

Long wavelength

8.0 dB

–9.5 to –3 dBm

–19 to -3 dBm

 

32,808 feet (10,000 meters)

 

Single-mode,

 

at 1310 nm

 

 

 

 

 

 

 

 

 

 

long haul

 

 

 

 

 

 

 

 

 

 

 

 

GLC-LX-SM4

Single-mode,

8 dB

–11 to –3 dBm

–19 to –3 dBm

–19 dBm

 

 

long-reach

 

at 1310 nm

 

 

 

 

 

 

 

 

 

 

GLC-ZX-SM5

Single-mode,

23 dB

0 to +5 dBm

–23 to 0 dBm

–23 dBm

 

 

extended-reach

 

at 1550 nm

 

 

 

 

 

 

 

 

 

 

1.dBm = decibels referenced to 1 milliwatt

2.nm = nanometer

3.Not valid for 4-Port Gigabit Ethernet ISE line card

4.4-Port Gigabit Ethernet ISE line card only

5.4-Port Gigabit Ethernet ISE line card only

Table 14 Gigabit Ethernet Laser Optical Transceiver (SFP) Module Operating Parameters

SFP Module

Type

Wavelength

Cable

Distance

 

 

 

 

 

GLC-SX-MM

Short wavelength

850 nm

MMF 62.5/125 micron

722 feet (220 m)

 

(multimode short haul)

 

 

 

 

 

MMF 50/125 micron

1640 feet (500 m)

 

 

 

 

 

 

 

 

GLC-LH-SM

Long wavelength

1310 nm

SMF 9/125 micron

32,808 feet (10,000 m)

 

(single-mode long

 

 

 

 

haul)

 

 

 

 

 

 

 

 

Cisco XR 12000 Series Router Ethernet Line Card Installation

48

OL-7861-01

 

 

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Image 48
Cisco Systems OL-7861-01 manual Power Transmit Receive Typical Maximum, Transceiver Budget Power
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OL-7861-01 specifications

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