TXC-04251AIPQ Transwitch Corporation, TXC-04251AIPQ Datasheet - Page 47

• Manufacturer Part Number: TXC-04251AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04251AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

T1 LOOPBACK CAPABILITY
The Quad T1 Mapper provides two types of T1 loopbacks, facility and line (i.e., at the facility side and at the line
side). Facility loopback per port is enabled when a 1 is written to control bit FnLBK. The internal transmit NRZ
clock and data output signals are looped back as the receive clock and data input signals as shown in Figure
15, and remain available at the output pins. The receive clock and data signals at the input are disabled.
Line loopback per port is enabled when a 1 is written to control bit LnLBK. The receive clock and data output
signals (rail) are looped back as the transmit data and clock signals (rail), as shown in Figure 15. The receive
line rail or NRZ clock and data output signals are provided at the receive interface. The transmit clock and data
signals (rail or NRZ) at the input are disabled.
SONET/SDH
REC
GEN
NRZ
AIS
XMIT
NRZ
Figure 15. Facility and Line Loopbacks
Bypass
AMI/B8ZS
AMI/B8ZS
Decoder
Coder
NRZ
DATA SHEET
- 47 -
NRZ
Rail
Rail
Line
Loopback
Data &Clock
Line Loopback
Bypass
Facility Loopback
Facility
Loopback
Data &Clock
Data & Clock
Data & Clock
(NRZ, Rail)
(NRZ, Rail)
Transmit
Receive
T1 Line
Ed. 4, March 2000
TXC-04251
TXC-04251-MB
QT1M