Cisco 7304 Installation Guide download pdf (Page 33)

3-9

Cisco 7304 Router Modular Services Card and Shared Port Adapter Hardware Installation Guide

OL-4681-01

Chapter 3 Overview: Cisco 7304 Router Shared Port Adapters

GigabitEthernet SPA Overview

The 1000BASE-ZX module must be coupled to single-mode fiber-optic cable, which is the type of cable

typically used in long-haul telecommunications applications. The 1000BASE-ZX module will not

operate correctly when coupled to multimode fiber, and it is not intended to be used in environments

where multimode fiber is frequently used (for example, building backbones, or horizontal cabling).

The 1000BASE-ZX module is intended to be used as a Physical Medium Dependent (PMD) component

for Gigabit Ethernet interfaces found on various switch and router products. It operates at a signaling

rate of 1250 Mbaud, transmitting and receiving 8B/10B encoded data.

When shorter lengths of single-mode fiber are used, it may be necessary to insert an in-line optical

attenuator in the link to avoid overloading the receiver.

• Insert a 10-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port

on the 1000BASE-ZX module at each end of the link whenever the fiber-optic cable span is less than

15.5 miles (25 km).

• Insert a 5-dB in-line optical attenuator between the fiber-optic cable plant and the receiving port on

the 1000BASE-ZX module at each end of the link whenever the fiber-optic cable span is equal to or

greater than 15.5 miles (25 km) but less than 31 miles (50 km).

SFP Module Cabling and Connection Equipment

Table 3-9 provides cabling specifications for the SFP modules that can be installed on the

SPA-2GE-7304. Note that all SFP ports have LC-type connectors.

The minimum cable distance for the SFP-FCGE-S is 6.5 feet (2 m), and the minimum link distance for

the SFP-GE-Z is 6.2 miles (10 km) with an 8-dB attenuator installed at each end of the link. Without

attenuators, the minimum link distance for the SFP-GE-Z is 24.9 miles (40 km).

Table 3-9 SFP Module Port Cabling Specifications

SFP Modules

Wavelength

(nm) Fiber Type

Core Size

(micron)

Modal

Bandwidth

(MHz/km)

Maximum

Cable Distance

SFP-FCGE-S 850 MMF

1. Multimode fiber (MMF) only.

62.5 160 722 ft (220 m)

62.5 200 902 ft (275 m)

50.0 400 1640 ft (500 m)

50.0 500 1804 ft (550 m)

SFP-FCGE-L 1300 MMF

and

SMF

62.5 500 1804 ft (550 m)

50.0 400 1804 ft (550 m)

50.0 500 1804 ft (550 m)

9/10 — 6.2 miles (10 km)

SFP-GE-Z 1550 SMF 9/10 — 49.7 miles

(80 km)

SMF

8 — 62.1 miles

(100 km)

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