Cisco Systems OL-7861-01 manual Transmit Receive Link, Power, Budget

Cabling and Specifications

Table 10 Ethernet GBIC Laser Optic Parameters (continued)

GBIC Module/					Distance1
Connector	Type	Wavelength	Fiber Type
WS-G5487=	Extended distance (single-mode)	1550 nm	10/9 micron SMF		43.5 miles (70 km)
SC connector
			8 micron SMF	2	62 miles (100 km)
CWDM-GBIC-x	Longwave (single-mode)	1470-1610	SMF 10/9 micron		62 miles (100 km)
xxx=3		nm4

1.These distances represent best case conditions, depending on fiber quality, dispersion, and losses due to connectors, nodes, or splices. In the case of the CWDM GBICs, CWDM OADM modules or mux/demux modules are needed for these GBICs to work in any topology other than a point-to-point topology within one building, so the maximum distance is determined by an optical power budget calculation that takes into consideration all sources of loss, including the insertion loss due to the CWDM OADM and mux/demux modules, and might be different from the distance shown in the table. For optical parameter information associated with the CWDM OADM and mux/demux modules, see the “Related CWDM Documentation” section on page 46.

2.Dispersion-shifted single-mode fiber-optic cable required for 100,000-meter distance.

3.Supported by 3-Port Gigabit Ethernet modules

4.The wavelengths of the CWDM GBICs are based on a 20-nanometer (nm) wavelength grid and are available in eight wavelengths: 1470, 1490, 1510, 1530, 1550, 1570, 1590, and 1610 nm.

Note

Note

Note

1000BASE-SX and 1000BASE-LX (LH) were originally part of the IEEE 802.3z standard, which has been incorporated into the IEEE 802.3 standard.

Use only GBIC modules supplied by Cisco with your Ethernet line card. They have been tested by Cisco Engineering and, in some cases, a Cisco-supplied GBIC might contain an internal erasable programmable read-only memory (EPROM) that identifies the GBIC to the Cisco IOS software.

The maximum distance for any fiber span in an optical network is determined by the fiber type and quality, as well as the span length, number of splices, and number of optical nodes in the path. If your network design requires the signal to travel close to the theoretical maximum distance (as listed in Table 11), you must calculate the optical power budget and receive (RX) sensitivity for the entire network topology to ensure it is within the specifications of the GBIC option in use.

Actual power budget calculations involve a number of variables specific to network topology and design, and are therefore outside the scope of this publication.

Table 11 Optical Parameter Values for Calculating Link Power Budget

	Transmit	Receive	Receive	Link	Maximum Distance1
GBIC	Power	Power	Sensitivity	Budget
WS-G5484=	2	–17 to 0 dBm	–17 dBm	7.5 dB	1,804 feet (550 m)
	–9.5dBm to 0 dBm
WS-G5486=	–11 to –3 dBm	–19 to –3 dBm –19 dBm		8 dB	6.2 miles (10 km)
WS-G5487=	0 to +5 dBm	–23 to 0 dBm	–23 dBm	23 dB	43.5 to 62 miles (70 to
					100 km3)
CWDM-GBIC-xxxx=	+1 to +5 dBm	–31 to –7 dBm	–31 dBm	32 dB	4
					62 miles (100 km)

1.These distances represent best case conditions, depending on fiber quality, dispersion, and losses due to connectors, nodes, or splices.

Cisco XR 12000 Series Router Ethernet Line Card Installation

44 OL-7861-01