Specifications
Appendix A
A.4.1 Functional Details
Ethernet
The 1000EAS/X is based on a L2 switch chip which supports non-blocking switching fabric with up to 1024
MAC lookup filtering table and support for Egress tagging/untagging selectable per port in any combination using
802.1Q VLAN support for 4094 VIDs and BPDU handling for spanning tree protocol. There are also 28 32bit and 2
64 bit RMON counters per port that can be displayed through the management system or received via SNMP
standard MIB statistics.
The 10/100/1000Base RJ-45 connectors are located on the front panel of the card along with two SFP cages
for industry standard 1.25Gbps SFP modules. All UTP connections are designed for auto MDI-X operation,
requiring only a straight connection to any device. A unique feature of the 1000EAS/X switch/converter is the use of
a common PCB card which may either be used as a standalone converter (FRM220-CH01 series) or placed in the
FRM220-CH20 rack.
Management
The 1000EAS/X 4-port switch card is managed by an embedded 32 bit CPU. When installed in the FRM220A
CH20 chassis, control and monitoring are passed to the GSW/SNMP. There are no DIP switches or manual
settings on the card. If the switch is placed stand-alone, without local or remote connection to FRM220A
GSW/SNMP management, the switch can be managed by its own Telnet terminal connection, via web based GUI
or by SNMP protocol.
Link Fault Pass Through (AKA LFP)
This switch/converter incorporates a Link Forwarding feature based on standard IEEE802.3u which allows
indirect sensing of a Fiber or UTP Link Loss via both the 10/100/1000 Base-TX UTP and 1000Base-SX/LX
connections. When this feature is enabled and the media converter detects a Link Loss condition on the Receive
fiber (Fiber LNK down), immediately sends a standard IEEE802.3u Far End Fault code by Transmit fiber to the
remote converter and it disables its UTP transmitter so that a Link Loss condition will be sensed on the receive
UTP port. (See the following figure) The link loss can then be sensed and reported by a Network Management
agent at the host equipment of local and remote UTP port and at the local fiber port. This feature is disabled by
default.
Broken Fiber, remote receive
fiber
remote
local
2. UTP disabled
condition forwarded
4. Link fault
sensed locally
1. fiber
broken
MC
MC
3. Fiber link
condition forwarded by FEF
Remote UTP disconnected
1. UTP
broken
46
Far End Fault (FEF)
The Far End Fault or FEF feature is a built-in part of the 802.3ah OAM. Besides alerting the local MC of a
remote fiber receive transmission break, the FEF is also used in reporting remote power failure or dying gasp.
Remote Rx fiber
Broken
fiber
3. Link fault
sensed locally
MC
MC
local
remote
2. UTP link
condition forwarded by FEF
4. FEF Led lit
fiber
remote
local
3. Fault condition sent
via OAM to far end
1. fiber
broken
MC
MC
2. FX Link Down