Foundry Networks Switch and Router, Installation And Configuration Manual, Page: 163 / 1070

December 2000 6 - 1
Chapter 6
Using Packet Over SONET (POS) Modules
This chapter describes the Foundry POS (Packet Over SONET) modules and how to configure and manage them.
SONET (Synchronous Optical Network) is based on a worldwide standard for fiber optic transmission, modified for
North American asynchronous rates. In the rest of the world, this technology is known as Synchronous Digital
Hierarchy (SDH). Foundry’s Packet over SONET (POS) is fully compatible with SONET and Synchronous Digital
Hierarchy (SDH) network facilities and is compliant with RFC 1619, “PPP over SONET/SDH,” and RFC 1662,
“PPP in HDLC-like Framing”.
POS (Packet over SONET) is the serial transmission of data over SONET frames through the use of Point-to-
Point Protocol (PPP). The Foundry POS modules allow direct connection to interfaces within the SONET. POS is
a transport technology that encapsulates packet data such as an IP datagram directly into SONET.
The POS modules are available on NetIron Internet Backbone routers and BigIron Layer 3 Switches with
redundant management modules. You can use multiple POS modules in a chassis.
You can install the following types of POS modules in a BigIron chassis running Layer 3 Switch software:
• B2P2488-SR – Contains two OC-48c ports providing 2488 Mbps each.
• Model B2P622 – Contains two OC-12c ports providing 622 Mbps each.
• Model B2P155 – Contains two OC-3c ports providing 155 Mbps each.
• Model B4P155 – Contains four OC-3c ports providing 155 Mbps each.
Figure 6.1 shows the front panel of the 622 Mbps POS module.
Figure 6.1 POS Module
The LEDs are described in “Status LEDs” on page 6-22.
Alarm
TxAct
1
B2P622
2
SONET/SDH
622 mbps
Link
RxAct
Alarm
TxAct
Link
RxAct