Synchronization and timing
• Synchronization can be derived from the incoming STM-1 or STM-4 (1643 AM
only) aggregate signals
• Synchronization can be derived from the incoming STM-1 tributary signals (1643
AM STM-4 version only)
• The 1643 AMS supports synchronization derived from an incoming 2 Mbit/s (E1 or
DS1) data inputfrom the main board and option card
• Re-synchronization of the 2 Mbit/s ports is supported
• Support of SSM byte according to ETSI ETS 300 417-6
• External synchronization output at 2.048 MHz is according to G.703-10
(SYNC-OUT, SYNC-I/O) via RJ45 connector with an impedance of 120 Ω
symmetrical or with an impedance of 75 Ω
• Internal Clock in accordance with ITU-T G.813 option 1.
Overhead bytes processing
The next table shows the processing of SOH (Section OverHead):
Overhead bytes Function Processing
A1-A2 Framing A1=11110110 (HF6)
Framing A2=00101000 (H28)
Yes
J0 Regenerator section trace
identifier
Yes
C1 Regenerator section trace
Trace/frame identifier
Fixed to 00000001
B1 RS Bit error monitoring (BIP-8) Yes
B2 MS Bit error monitoring (BIP-8) Yes
D1 to D12 Data communication channel
(DCC) D1 to D3 or D4 to D12
can be selected
D1-D3 fixed to
01010101 D4 to D12
used as DCC
E2
Codirectional interfaces at 64
kbit/s (J64), in accordance with
G.703 (Service channel)
Yes
F1 64 kbit/s user channel Fixed to 11111111
K1, K2 (bit 1 to 5) Automatic Protection Switching
(APS) channel for MSP
Yes
K2 (bit 6 to 8) Remote alarm MS (MS-FERF) Yes
S1 Synchronization state Yes
M1 Remote error indication MS
(MS-REI)
Yes
Z1, Z2 Reserved Fixed to 11111111
Technical Specifications
System specifications
...................................................................................................................................................................................................................................
365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
10-11
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