AK2540 Datasheet, PDF (19/33 Pages) Asahi Kasei Microsystems – Quad T1 Transceiver

ASAHI KASEI
[AK2540]
Jitter Attenuator (Hardware Mode and Host Mode)
Jitter Attenuator may be placed either transmitter path or receiver path, or bypassed according to
JASELR and JASELT both in Hardware Mode and Host Mode as described in table 2. Jitter
Attenuators are to be placed at the same place in channel 1 through channel 4.
Table 2. Jitter Attenuator Place Selection
JASELR
0
0
1
1
JASELT
0
1
0
1
Location of Jitter Attenuator
Bypassed
Transmitter
Receiver
Reserved (NA)
AIS (Hardware Mode and Host Mode)
AIS in channel x is selected when AISx is “high”. In AIS mode the TPOS and TNEG inputs are
ignored, but the transmitter remains locked to the TCLK input. AIS can be enabled
simultaneously with Local Loopback. AIS overdrives Remote Loopback. In this mode, either all
ones or all zeros are transmitted according to the AIS1SEL selection. (see table 3)
Table 3. AIS Control
AISx AIS1SEL
0
0
0
1
1
0
1
1
X=1,2,3 and 4
TTIP/TRING
Normal
Normal
All “0”
All “1”
MS0012-E-00
19
2000/1