ZXR10 GER (V2.6.03) General Excellent Router User Manual Volume-I
96
Confidential and Proprietary Information of ZTE CORPORATION
Packet over SONET (PoS) technology, which allows efficient
transport of data over SONET/SDH, has certainly been a major
player in accommodating explosive growth on Internet.
PoS provides a flexible solution to well known applications that
includes network backbone infrastructures and data aggregation
or distribution on network edge and in metropolitan area. Router
PoS interfaces are frequently connected to Add Drop Multiplexers
(ADMs), terminating point-to-point SONET/SDH links. Direct
connections over dark fiber or via dense wave-division
multiplexing (DWDM) systems are becoming increasingly popular.
Basic transmission rate of SONET (51.840 Mbps), referred to as
Synchronous Transport Signal level 1 (STS-1), is obtained by
sampling 810-byte frames at 8000 frames per second. SONET
features an octet-synchronous multiplexing scheme with
transmission rates in multiples of 51.840 Mbps.
There are different POS interfaces in ZXR10 GER depending
upon transmission rates, which are described in Figure 60 , also
shown are corresponding transmission rates and terminology for
SDH. SDH is SONET-equivalent specification proposed by
International Telecommunications Union (ITU). SDH supports
only a subset of SONET data rates, starting from 155.520 Mbps.
F
I G U R E
6 0
S
O N E T
S
D H
R
A T E S
PoS use PPP in High-Level Data Link Control (HDLC)-like framing
(as specified in RFC 1662) for data encapsulation at Layer 2
(data link) of Open System Interconnection (OSI) stack. This
method provides efficient packet delineation and error control.
The frame format for PPP in HDLC-like framing is shown in
F
I G U R E
6 1
P
P P
F
R A M E
F
O R M A T
RFC 2615 specifies use of PPP encapsulation over SONET/SDH
links. PPP was designed for use on point-to-point links and is
Network
Backbone
Infrastructure
Sonet/SDH
Rates
ZTE POS
Pos Framing
RFC2615
Содержание ZXR10 GER
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