TXC-06312BIOG Transwitch Corporation, TXC-06312BIOG Datasheet - Page 113

• Manufacturer Part Number: TXC-06312BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06312BIOG

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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11.3 FRAME REFERENCE PULSES
11.3.1 Generation of Frame Reference Pulse
11.3.2 Locking on External Frame Reference Pulse
A Frame Reference Pulse is necessary wherever timing has to be (re)generated in the
PHAST-12N. The PHAST-12N can lock on an externally provided Frame Reference Pulse,
making it possible to align with other devices, or generate the Frame Reference Pulse
internally.
The (generated) System Frame Reference Pulse is available via the REFSYSFS lead.
A System Frame Reference Pulse is generated every 125 us (8 kHz) when
ExtFramePulseExpected is deasserted. The generated System Frame Reference Pulse can
be monitored or used by other devices in order to align with the PHAST-12N via the
REFSYSFS lead. For the relationship between the System Frame Reference Pulse and the
Add and Drop Telecom Bus timing, see
When ExtFramePulseExpected is asserted, the PHAST-12N will lock on an external Frame
Reference Pulse (REFTXFS lead) and will generate a System Frame Reference Pulse. When
the distance between two consecutive Frame Reference Pulses is not exactly 125 us, a Loss
Of Frame defect (LOF) will be generated.
This LOF defect is cleared as soon as two consecutive pulses with a distance of 125 us have
been received. The System Frame Reference Pulse will still be generated during LOF state,
locked on previously accepted Frame Pulse.
- High Order Pointer Tracking, Retiming and Pointer Generation -
REFSYSFS
REFTXFS
Figure 39. Frame Reference Pulse Generation
Telecom Bus
Generator
Retimer
POH
ADD
Tracking
Retimer
Pointer
Figure
High Order Path Cross Connect
17.
PRELIMINARY TXC-06312B-MB, Ed. 2
PHAST-12N Device
DATA SHEET
Tracking
Retimer
Pointer
TXC-06312B
June 2005