Important! The equipment can process IT0 on the 2 Mbit/s G.703 interfaces to
G.704/I.431/ETSI ETS 300 011. The bits reserved for national usage support the
loop-back command (Sa6 in ETR001/I.604) and the loop signaling. It is possible to
replace IT0 in both the PDH to SDH direction and in the SDH to PDH direction.
Cross-connect flexibility
The 1643 AM Cross Connect architecture consists of two cross-connects. A
Lower-Order Cross Connect (LO-CC) for VC-12 and VC-3 cross-connection and a
Higher Order Cross Connect (HO-CC) for VC-4 cross-connection.
High Order Cross-Connects
On STM-1 units, the HO-CC is fixed such that both the VC-4 from east and the VC-4
from west are terminated at the LO-CC.
On STM-4 units (1643 AM) the HO-CC is flexible; it allows for the cross-connection
of:
• One VC-4 (the operator can pick any) from west to the LO-CC
• One VC-4 (the operator can pick any) from east to the LO-CC.
• Two VC-4s from east or two VC-4s from west or one VC-4 from east and one
VC-4 from west to the STM-1 tributaries
• Any VC-4 from east to any VC-4 to west.
STM-n
Optics
(West)
Power Supply
MDI
MDO
Circuits
0V
Chassis Ground
From Power supply AC or DC
3.3Vdc
Tx
Rx
Tx
Rx
STM-n
Optics
(East)
Microprocessor
Control Circuits
and
Red
(Fault)
Green
(Power active)
F-Interface
4
4
LAN-Q
to EMS or other NEs
T3 (Timing Output 2 MHz)
STM-4 Line Interface
STM-4 Application only
STM-4 Application only
mMUX
16
E1
E1
“HDB3”
Drivers
Higher Order Cross-Connect
to ITM-CIT
16
E1
Lower Order Cross-connect
Metropolis
¨
AM
P2 Connector
P1 Connector
Product description
System Architecture
...................................................................................................................................................................................................................................
365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-11
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