This application note shows how to connect our T3/E3 line interface units (LIUs) in clear-channel, transMUX, and map/demap applications with the Agere Ultramappers™.
This application note shows a how to connect the Maxim DS3150 or DS315x series of T3/E3 LIUs to the Agere Ultramappers™. The DS3150 and DS315x series of T3/E3 LIUs perform all the functions necessary for interfacing at the physical layer to T3 and E3 lines. The DS3150 is a Hardware only, single port T3/E3 LIU, while the DS3151, DS3152, DS3153 and DS3154 offer both Hardware and CPU Bus modes in 1, 2, 3, or 4 ports respectively. This application note will illustrate connecting to the DS3150 with the connection to the DS315x series being similar.
The Agere Ultramapper Device Family includes the following: Ultramapper, UltramapperLite, Ultramapper Full Transport, and Ultraframer. This application note will discuss applications that pertain only to the following Agere devices: UltramapperLite and Ultraframer.
The following diagrams will illustrate Maxim T3/E3 LIUs from the DS315x series or multiples of the DS3150. Depending on the linecard/system design, the designer will need to choose which of the five Maxim LIUs to utilize.
T3/E3 Clear Channel Application
In this application, two UltramapperLites are configured to terminate/transmit twelve T3/E3 signals from/to T3/E3 mapped STS-12/STM-4 signals.
Figure 1. T3/E3 clear channel application.
T3/E3 TransMUX Application
In this application, four UltramapperLites are configured to transMUX between two different scenarios: between one VT1.5/VC11 mapped STS-12 and twelve T1 channelized T3 signals; and between one VT2/VC12 mapped STS-12 and twelve E1 channelized E3 signals.
Figure 2. T3/E3 TransMUX application.
T3/E3 and T1/E1 Map/Demap Application
In this application, one Ultraframer is configured to map/demap between three channelized T3/E3 signals and 84/48 T1/E1 signals.
Figure 3. T3/E3 and T1/E1 Map/Demap application.
T3/E3 and DS0/E0 Map/Demap Application
In this application, one Ultraframer is configured to map/demap between three channelized T3/E3 signals and upto 2016/1536 timeslots of DS0/E0 signals.
Figure 4. T3/E3 and DS0/E0 Map/Demap application.
Maxim T3/E3 Line Interface Unit Configuration
With the Agere Ultramapper in M13/E13 MUX/DeMUX applications, a free-running 44.736MHz T3 or 34.368MHz E3 clock should be provided to pin DS3DATAOUTCLK for M13/E13 functionality. In SONET/SDH to T3/E3 applications where DS3/E3 Digital Jitter Attenuator is used on the receive path: SONET/SDH
(DS3/E3 Digital Jitter Attenuator)
T3/E3; the DS3DATAOUT input is not needed for M13/E13 functionality. Instead, a free-running 44.736MHz DS3XCLK clock and a 34.368MHz E3XCLK clock are required for T3/E3 Digital Jitter Attenuator functionality. The Agere Ultramapper T3/E3 line interface is straightforward to connect to the Maxim T3/E3 LIUs. As far as T3/E3 connections are concerned, there are no differences between the master Ultramapper and slave Ultramapper.
The interface between a T3/E3 analog line and a Line Interface Unit can be in either bipolar or unipolar mode. Table 1 lists the register settings of the Agere Ultramapper for DS3/E3 Bipolar/Unipolar control.
|Table 1. Agere Ultramapper DS3/E3 Bipolar/Unipolar Control Bits
||Transmit DS3/E3 Bipolar/Unipolar. Note this is valid only if register 0x0018 [13:12] = 11.
||Receive DS3/E3 Bipolar/Unipolar. Note this is valid only if register 0x0018 [5:4] = 11.
||Per Channel Control Bit
1: HBD3 or B3ZS.
||Per Channel Control Bit
1: B3ZS coding.
0: HDB3 coding.
||1: B3ZS encoding/decoding, i.e., DS3 I/O is in dual-rail mode where each rail carries a
polarity of a bipolar I/O.
0: DS3 I/O is a single-rail, unencoded NRZ signal.
||1: E3 output is HDB3 encoded and dual-rail.
0: E3 output is single-rail unencoded.
||00: HDB3 decode disabled (input data on positive rail only).
01: HDB3 decoder enabled, input on P/N rails.
10: HDB3 decoder disabled (input data on positive rail only).
11: HDB3 decoder disabled, negative input rail carries HDB3 error count from external LIU.
This application note has shown how to connect our T3/E3 LIUs to the Agere Ultramapper Device Family.
If you have further questions about connecting any of our T3/E3 LIUs, then please contact the Telecommunication Applications support team
Maxim DS3/E3 LIU Information
For more information about our T3/E3 LIUs, please consult the data sheets available on our website at www.maximintegrated.com/telecom.