Cisco ATM Cable Interface Processor ACIP-SM(=) Руководство по установке и настройке - Страница 7
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For the ACIP, the signal must meet the worst case parameters listed in Table 4.
Table 4
Parameter
PT
PR
PB
Multimode Power Budget Example with Sufficient Power for Transmission
The following is an example multimode power budget calculated based on the following variables:
•
Length of multimode link = 3 kilometers (km)
•
4 connectors
•
3 splices
•
Higher order loss (HOL)
•
Clock recovery module (CRM)
Estimate the power budget as follows:
PB = 11.5 dB – 3 km (1.0 dB/km) – 4 (0.5 dB) – 3 (0.5 dB) – 0.5 dB (HOL) – 1 dB (CRM)
PB = 11.5 dB – 3 dB – 2 dB – 1.5 dB – 0.5 dB – 1 dB
PB = 3.5 dB
The value of 3.5 dB indicates that this link would have sufficient power for transmission.
Multimode Power Budget Example of Dispersion Limit
Following is an example with the same parameters as the previous example, but with a multimode
link distance of 4 km:
PB = 11.5 dB – 4 km (1.0 dB/km) – 4 (0.5 dB) – 3 (0.5 dB) – 0.5 dB (HOL) – 1 dB (CRM)
PB = 11.5 dB – 4 dB – 2 dB – 1.5 dB – 0.5 dB – 1 dB
PB = 2.5 dB
The value of 2.5 dB indicates that this link would have sufficient power for transmission. But,
because the dispersion limit on the link (4 km x 155.52 MHz > 500 MHzkm), this link would not
work with multimode fiber. In this case, single-mode fiber would be the better choice.
ACIP Cables, PLIM, and Connections
An ACIP interface cable is used to connect your router to an ATM network. For SONET/SDH
(STS-3C) multimode connections, use one multimode duplex SC-type connector (see Figure 2) or
two single SC-type connectors. (See Figure 3.)
ACIP SONET Signal Requirements
Multimode
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ATM Cable Interface Processor (ACIP) Installation and Configuration
ACIP Description
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