Sagem 3p@c – Sagem 4450E User Manual

Page 41

SAGEM 3P@C

3P@C Installation Manual

Page 2-18

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1.1.1.16

Interface features of the DS-1GSX module

Table 2-12 Interface features of the DS-1GSX module

Module
type

Quantity
of
interfaces

Interface
type

Interface
attributes

Fiber
specifications

Transmi
ssion
distance

62.5/125 µm multi-
mode fiber with a
wavelength of 850
nm

275m

DS-1GSX

1000Base-
SX

50/125 µm multi-
mode fiber with a
wavelength of 850
nm

550m

The fiber system is divided into two types by the optical transmission mode: Multi-mode fibers and
single-mode fibers. A multi-mode optical fiber is a fiber that transmits signals in multiple modes at a
given wavelength. Phase difference may occur in the multi-mode transmission because the lights of
different modes will transfer at different speeds along a line. As a result, transmission distortion will
occur and thus the transmission band will be restricted. Two specifications are available now for the
cores of multi-mode optical fibers: 62.5 µm and 50 µm. In ISO/IEC 11801, both the two modes are
recognized transmission media.

2.5.3.

2.5.3. 2-port 100M Multi-mode Optical Interface Module (DS-2FMM)

The DS-2FMM module provides 2 100M multi-mode fast Ethernet optical interfaces. The physical
interface is a standard SC optical interface and the multi-mode fiber is used whose maximum
transmission distance is 2 km. Two pairs of multi-mode fibers are required for it. The fiber length and
peer interface type depend on the real situation.

1.1.1.17

Structure of the DS-2FMM module

The front panel of the DS-2FMM module is shown in the Figure 2-22:

Figure 2-22 Front view of the DS-2FMM module

DS-2FMM 100M

interface module

SC multi-mode

optical interface

Status LED

The front panel of the DS-2FMM module is composed of the following parts:

2 standard SC 100M multi-mode optical interfaces

2 LINK status indicator

2 ACT status indicator