Zhone IMACS 8000, Руководство пользователя

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4-16 Reference Guide
Model No.
Running Head
OC3 Point to Point Server (8000-OC3-PT2PT) Applications
IPR*4 supports SNMP for Ethernet, IP and Routing MIBs. It uses the standard Ethernet
encapsulation, utilizing 14 bytes Ethernet Header: Source Ethernet Address (6 bytes),
Destination Ethernet Address (6 bytes), and a Protocol Type (2 bytes). The IPR*4 card
supports RIP (Routing Information Protocol, RFC 1058) as well as RIPv2, used for
dynamically discovering IP routes from adjacent IP routers.
The WAN interface is standard encapsulation of IP datagrams over a PPP link, or over an
HDLC link.
• The IMACS IPR*4 card does not support PPP authentication. The IPR*4 card is not
designed to be a general purpose enterprise router, but rather is designed to extend the
IMACS network of command and control applications contained within the customers
T1/E1 network.
4.6 OC3 Point to Point Server (8000-OC3-PT2PT)
The 8000-OC3-PT2PT (OC3 Point to Point) server cards are developed as a optical uplink
communications media for applications that require additional bandwidth transport and
installations that require less interference that can be caused by nearby high-power voltage
generation such as can be found at power generation plants. The OC3 server card can
terminate eight T1 facilities onto the backplane as is the traditional IMACS T1 capacity. In
addition to that capability, the OC3 card also offers the ability to transport sixteen additional
facilities via a faceplate connector on the OC3 card. These additional facilities will alarm to
the user manifest should they enter into alarm, but otherwise are purely a transport method to
allow for additional local facilities to be transported over the optical cable. In addition to the
introduction of an optical uplink on the IMACS, the OC3 card system can still maintain
electrical facilities if so desired. New timing offerings have also been introduced to the
IMACS shelf, where a node can now be optically timed off of the incoming fiber, or provide
shelf timing from the OC3 card itself.
In addition, the OC3 card allows for two STS containers to be sent from one end of the circuit
to the other. In the initial release, no packet manipulation is done and the two STS pipes act as
an Ethernet extender.
SONET compliancy on the product has not yet materialized. Having the IMACS OC3 card in
a book ended fashion allows for proper maintenance activities such as protection switching
(both automatic and manual) to perform to an operators expectation. However, placing the
OC3 card as a drop point to a SONET based product has limitations as far as the manual
protection switch is concerned. Until Zhone completes the SONET integration of the product,
it is only supported in a true point to point configuration.