Cisco Cisco DWDM Transceiver Modules Data Sheet
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Figure 4. Bidirectional Transmission of a Single Strand of SMF
The GLC-BX-D and GLC-BX-U SFPs also support digital optical monitoring (DOM) functions according to the
industry-standard SFF-8472 multisource agreement (MSA). This feature gives the end user the ability to monitor
real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current,
and transceiver supply voltage.
2-Channel 1000BASE-BX10-D for Single-Fiber Bidirectional Applications
The 2-channel 1000BASE-BX-D SFP module, also known as Compact SFP, integrates two IEEE 802.3ah
1000BASE-BX10-D interfaces in one SFP module. The GLC-2BX-D or GLC-2BX-D-I is always connected to two
1000BASE-BX10-U interfaces over two single strands of standard SMF with an operating transmission range up to
10km.
GLC-2BX-D or GLC-2BX-D-I is designed to connect to any standard-based Customer Premises Equipment (CPE)
in FTTx links (Figure 3).
Figure 5. Compact SFP Deployment with Cisco Catalyst 4500
1000BASE-BX40-D and 1000BASE-BX40-U for Single-Fiber Bidirectional Applications
The Cisco GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs operate on a single strand of standard SMF.
A GLC-BX40-D-I or GLC-BX40-DA-I device connects to a GLC-BX40-U-I device with a single strand of standard
SMF with an operating transmission range up to 40 km.
The communication over a single strand of fiber is achieved by separating the transmission wavelength of the two
devices. The GLC-BX40-D-I, GLC-BX40-DA-I, and GLC-BX40-U-I SFPs also support digital optical monitoring
(DOM) functions according to the industry-standard SFF-8472 multisource agreement (MSA). This feature gives
the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input
power, temperature, laser bias current, and transceiver supply voltage.