■ ML53612 ■ ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
tum 3 requirement of 255/day. During normal operation new holdover values are updated at 128ms
intervals.
To make an MTIE compliant reference switch, enable "Condition Master PLL reference", select the "Mas-
ter PLL Reference", and configure the "Master PLL Mode " to normal.The master PLL will be locked to
the selected reference.
The following sequence will produce an MTIE-compliant reference switch:
1. Change the "Master PLL Mode" from Normal to Holdover. The master PLL can also be configured to
make this change automatically in the event of a master PLL error.
2. Change the "Master PLL Reference Select" to the new reference, or change the reference source of
CT_NETREF.
3. Change the "Master PLL Mode" back to Normal.
MTIE Specifications
ML53612
100 ns
AT&T 62411 Stratum 3 and 4E
1 µs
MTIE during rearrangement
Phase change slope
81 ns / 1.326 ms
81 ns / 1.326 ms
4.10 Reference Master
CT_NETREF_1 and CT_NETREF_2 can be independently configured to output a reference signal to the
CT Bus selected from one of two local network reference inputs. The local network references can be
passed through or divided by 192, 193, or 256.
4.11 Local Clock and Frame Sync
Two sets of local clock and frame sync are provided. A variety of clock frequencies, polarities, and fram-
ing formats may be selected to allow "glue less" local port interfacing. Each set of local clock and frame
sync may be configured separately. The frequency selection is independent of the local stream rate.
4.12 Local Streams
The local streams consist of up to two serial input ports and two serial output ports. The local streams
can be configured to operate as two 2 Mbps streams, one 4 Mbps stream, or one-half of an 8 Mbps stream.
Local Stream Time-Slot to Channel Mapping
Local stream
L_SI_0, L_SO_0
L_SI_1, L_SO_1
8 Mbps stream rate time-slot 63:0 4 Mbps stream rate time-slot 63:0 2 Mbps stream rate time-slot 31:0
channel 63:0
-
channel 63:0
-
channel 31:0
channel 63:32
Note: When 8 Mbps stream rate is selected, time-slots 127:64 are not used.
4.13 CT Bus Streams
Connection to all 32 CT Bus streams is supported without restriction. The upper 16 streams run at 8
Mbps while the lower 16 may be configured, in groups of four, to operate at 8 Mbps, 4 Mbps, or 2 Mbps.
10
Oki Semiconductor
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