XRT75VL00D datasheet(53/92 Pages) EXAR

53 / 92 page

XRT75VL00D

REV. 1.0.3

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

this SDH signal arrives at the remote PTE, this DS3 or E3 signal will then be extracted from the SDH signal,

and will be output to some other DS3/E3 Terminal Equipment for further processing.

Figure 30 presents an illustration of this approach to transporting DS3 data over a SONET Network

As mentioned above a DS3 or E3 signal will be asynchronously mapped into a SONET or SDH signal and then

transported over the SONET or SDH network. At the remote PTE this DS3 or E3 signal will be extracted (or

de-mapped) from this SONET or SDH signal, where it will then be routed to DS3 or E3 terminal equipment for

further processing.

In order to insure that this "de-mapped" DS3 or E3 signal can be routed to any industry-standard DS3 or E3

terminal equipment, without any complications or adverse effect on the network, the Telcordia and ITU-T

standard committees have specified some limits on both the Intrinsic Jitter and Wander that may exist within

these DS3 or E3 signals as they are de-mapped from SONET/SDH. As a consequence, all PTEs that maps

and de-mapped DS3/E3 signals into/from SONET/SDH must be designed such that the DS3 or E3 data that is

de-mapped from SONET/SDH by these PTEs must meet these Intrinsic Jitter and Wander requirements.

As mentioned above, the LIU can assist the System Designer (of SONET/SDH PTE) by ensuring that their

design will meet these Intrinsic Jitter and Wander requirements.

This section of the data sheet will present the following information to the user.

• Some background information on Mapping DS3/E3 signals into SONET/SDH and de-mapping DS3/E3

signals from SONET/SDH.

• A brief discussion on the causes of jitter and wander within a DS3 or E3 signal that mapped into a SONET/

SDH signal, and is transported across the SONET/SDH Network.

• A brief review of these Intrinsic Jitter and Wander requirements in both SONET and SDH applications.

• A brief review on the Intrinsic Jitter and Wander measurement results (of a de-mapped DS3 or E3 signal)

whenever the LIU device is used in a system design.

• A detailed discussion on how to design with and configure the LIU device such that the end-system will meet

these Intrinsic Jitter and Wander requirements.

FIGURE 30. A SIMPLE ILLUSTRATION OF A DS3 SIGNAL BEING MAPPED INTO AND TRANSPORTED OVER THE SONET

NETWORK

PTE

SONET

Network

DS3 Data

XRT75VL00D Datasheet(PDF) 53 Page - Exar Corporation