Nortel-networks 450 User Manual download pdf (Page 256)

Using the BayStack 450 10/100/1000 Series Switch

C-10

302401-D Rev 00

There are two 1000BASE-LX (longwave gigabit) MDA models (Figure C-4):

• The 450-1LR MDA is a single MAC MDA with a separate redundant Phy

(backup Phy port). Only one Phy port can be active at any time. If the active

Phy port fails, the redundant Phy port automatically becomes the active port.

• The 450-1LX MDA is a single Phy MDA.

Both models conform to the IEEE 802.3z 1000BASE-LX standard and use

longwave 1300 nm fiber optic connectors to connect devices over single mode

(3 kilometer) or multimode (550 meters) fiber optic cable.

Figure C-4. 1000BASE-LX MDA Front Panels

Table C-4 describes the 1000BASE-LX MDA components and LEDs.

Note:

The optical performance of this transceiver cannot be guaranteed when

connected to a multimode fiber plant without the use of the special offset SMF/

MMF mode conditioning patch cord (see “

1000BASE-LX Multimode

Applications” on C-13)

1000BASE-LX

TX RX

Phy

Link

Activity

450-1LX MDA

BS45045A

TXRX

1000BASE-LX

Activity

Link

Phy Select

450-1LR MDA

(1-port redundant)

450-1LX MDA

(single port)

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Nortel-networks 450 User Manual Page 256