User manual

Appendix A
41
Fiber
(SC Type)
LED
Indicators
10/100
Ethernet
CPU
Chip
Appendix A. Line Cards
Introduction
The FRM220 In-Band Managed Media Converter Chassis is designed to accept a variety of fiber to copper or
fiber to fiber converter line cards. As line cards are added, this section will be updated with the relevant
information for the new line cards. The management interface and all line cards support software upgrading so
that new line cards and new features may be added at a future date. Please refer to Chapter 3 for details on the
upgrade method and procedures for operating the FRM220.
A.1 FRM220-10/100i In-band managed 10/100 Fiber Media Converter
The FRM-10/100i (in-band converter) is a In-band Managed (OAM) Fiber Ethernet media converter (MC) that
supports 10Base-T or 100Base-TX and converts to 100Base-FX (fiber). The UTP side supports auto-negotiation or
forced settings for speed and duplex by setting as well as auto-MDIX. When the FRM-10/100i is placed in the
FRM220 with NMC, the settings are controlled by the chassis management system. The remote FRM-10/100i stand-
alone may also be configured from the FRM220 through the in-band management features (OAM).
Specifications
Complies with IEEE 802.3 and IEEE 802.3u
Auto MDIX on UTP side
Far End Fault indication (via OAM)
Link Fault Pass Through (LFP) enable or disable
288kb packet buffer in switch mode
1K MAC address table in switch mode
Forward 2046 bytes packet in switch mode
Supports IEEE802.3x flow control in switch mode
Ingress/Egress Bandwidth Control (nx32K or nx512k)
Selectable switch or converter operation mode
Supports 9Kbytes jumbo packet in converter mode
Low latency in converter mode
Pass all frames including OAM/fragment in converter mode
10Base-T UTP Cable Requirement
Cable type: Category 3, 4 or 5. Maximum distance: 100 meters (328 feet)
100Base-TX UTP Cable Requirement
Cable type: Category 5, minimum. Maximum distance: 100 meters (328 feet)
Management
The 10/100i line card is managed by an on-card CPU when installed in the FRM220 CH20 chassis. There are no DIP
switches or manual settings. If the MC is placed stand-alone, without local or remote connection to FRM220 NMC
management, the MC runs with default parameter. The default parameters are: switch mode, auto-negotiation,
LFP disabled, ALS (Auto Laser Shutdown) disabled, and no bandwidth limit.
Operation Modes
The default operational mode for the FRM-10/100i is 'switch mode'.
When the MC works in 'switch mode' mode, it does not begin to forward a packet to a destination port until after
the entire packet is received. The latency therefore depends on the packet length. The maximum packet length
supported is up to 2046 bytes in this mode. Different from a normal switch chip, the MC's chip supports
forwarding IEEE802.3x pause frame. In 'switch mode' the MC operates with a 'store & forward' method that
supports a 1K MAC address table. The UTP side may be 10 or 100 speed and in full or half duplex, while the fiber
side runs in 100Base, full duplex.
In 'converter mode', the MC operates with low latency. The transmission does not wait until the entire frame is
received, but instead it forwards the received data immediately. Both transceivers (UTP and Fiber) in the MC are
interconnected via the OAM (Operation, Administration and Maintenance) engine while the internal switch engine
and data buffer are not used. The MC filters OAM frames and supports 9KB jumbo packet in this mode. Again, the
switch engine is disabled in this mode and the UTP must be 100Base, Full Duplex to match the fiber's 100Base-Full.