4RF Aprisa XE User Manual page 164

162 | Cross Connections
T1 Framed Modes
Framed Mode
T1 SF - PTS
T1 SF - DMS
T1 ESF - PTS
T1 ESF - DMS
T1 SF - PTS mode
T1 SF - PTS mode provides 24 timeslots to transport traffic using the G.704 12 frame Super Frame without
demultiplexing the signalling.
Pass Thru Signalling provides cross connection of the entire framed T1 timeslot between T1 ports
(including the inherent robbed bit signalling). This is the most efficient method of transporting a framed
T1 over the radio link as no additional radio link capacity is required to transport the signalling because
the CAS is not demultiplexed.
To maintain multi frame alignment between two framed T1 ports, a FPS (Frame Pattern Sync) bit is
required to be cross connected between the two framed T1 ports. This FPS bit requires an additional
8 kbit/s of radio link capacity.
The timeslot table left column is used to map timeslot bits but the timeslot table right column for CAS bits
(ABCD) is not used.
T1 SF - PTS mode is used when access to the signalling bits is not required but are transported between
T1s, for example:
Drop and Insert connections between Super Frame T1s or data interfaces
T1 SF – DMS mode
T1 SF – DMS mode provides 24 timeslots to transport traffic using the G.704 12 frame Super Frame with
four state demultiplexed signalling using the AB bits each with a bit rate of 333 bit/s.
DeMultiplexed Signalling allows the cross connection of framed T1 ports to other interface ports e.g. to a
Q4EM or HSS. An additional 8 kbit/s of radio link capacity is required to transport each CAS bit over the
radio link.
The mapping left column is used to map timeslot bits and the timeslot table right column is used to map
the CAS A&B bits for signalling (C&D bits are not used).
T1 SF – DMS mode is used when access to the signalling bits is required, for example:
Cross connecting signalling from a Q4EM interfaces into a 12 frame Super Framed T1.
Drop and Insert connections between Super Framed T1s or data interfaces
Description
Provides 24 timeslots to transport traffic using the G.704 12 frame Super
Frame with Pass Thru Signalling (PTS). There is no CRC capability with the
SF.
Provides 24 timeslots to transport traffic using the G.704 12 frame Super
Frame with DeMultiplexed Signalling (CAS AB bits). There is no CRC
capability with the SF.
Provides 24 timeslots to transport traffic using the G.704 24 frame Extended
Super Frame with Pass Thru Signalling (PTS) and CRC.
Provides 24 timeslots to transport traffic using the G.704 24 frame Extended
Super Frame with DeMultiplexed Signalling (CAS ABCD bits) and CRC.
Aprisa XE User Manual