DS34S132GNA2+ Maxim Integrated, DS34S132GNA2+ Datasheet - Page 51

• Manufacturer Part Number: DS34S132GNA2+
• Description: Communication ICs - Various 32Port TDM-Over-Pack Transport Device
• Manufacturer: Maxim Integrated

Specifications of DS34S132GNA2+

• Rohs: yes
• Part # Aliases: 90-34S13+2N2

Figure 9-17. T1/E1 Port Line Loopback and TDM Port Timeslot Loopback Diagram
The TDM Bundle Loopback is enabled using
loopback takes received RXP packet data and re-transmits that data in TXP packets. To work properly, when this
loopback is used, all Timeslots for an RXP Bundle should be enabled for loopback; the TXP and RXP Bundles
should be programmed to use the same number of Timeslots and the same functions (e.g. if the RXP Bundle is
Structured, the TXP Bundle should also be Structured); and the Receive TDM Port timing source should be equal
to the data rate of the RXP Packet data (the Receive TDM Port timing determines the fill rate of the TXP Packet).
In the RXP direction, data received from RXP packets is also transmitted at the transmit TDM Port. In the TXP
direction, data that is received at the TDM Port for Timeslots that are in loopback is discarded. This loopback is
depicted in
The diagram does not depict how “normal” data continues to be forwarded to and from the Ethernet Phy.
Figure 9-18. T1/E1 Port Bundle Loopback Diagram
The TDM Bundle Loopback de-encapsulates the payload data from RXP packets, sends the RXP payload data
back in the TXP direction and then re-encapsulates the data into a TXP packet. The data for the TDM Line and
TDM Line Timeslot Loopbacks is not “packetized” (encapsulated/de-encapsulated) before loopback.
Each TDM Loopback type can be enabled for both Structured and Unstructured data streams.
9.2.6.2
A TDM Port can be tested using a BERT test pattern. The S132 supports “Full Channel” (bidirectional) and “Half
Channel” (unidirectional) TDM BERT Testing. Only one TDM BERT Test can be enabled on an S132 device at a
time. The “Full Channel” and “Half Channel” BERT Tests are depicted in
Figure 9-19. TDM Port BERT Diagram
The Full Channel (Roundtrip) Test requires a loopback at the far end (left side of diagram). The S132 Decap BERT
Pattern Generator sends a BERT Pattern to the S132 Transmit TDM Port. The Encap BERT Monitor verifies that
data, returned at the Receive TDM Port, is error free.
19-4750; Rev 1; 07/11
Full Channel
(Roundtrip)
BERT
Half
Chan
(1-way)
BERT
Remote T1/E1
Remote T1/E1
TDM BERT
Device
Device
Figure 9-18
Framer/LIU
Framer/LIU
Generator
T1/E1
T1/E1
Monitor
BERT
BERT
using a T1/E1 example. The arrow in the figure shows the direction of the looped back data.
PSTN
X
X
Pn.PRCR3.PTPRTSL
X
X
S132
S132
Framer
T1/E1
LIU &
(32 bits, one for each TDM Port Timeslot). This
Decap BERT
Encap BERT
Figure 9-19
RXP TDM
Generator
TXP TDM
Monitor
S132
using a T1/E1 Example.
X
DS34S132 DATA SHEET
Ethernet
Ethernet
Phy
Phy
Ethernet
Phy
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