Alcatel 1660SM Technical Handbook page 541

[2] Ethernet Switch module
In ISA ES4–8FE board, 25 ports are used, in which 8 of them for 100BASE–T line side interface, one for
1000Base SX, LX, ZX while other 16 for SDH mapper.
The basic functions supported are following listed:
•
MAC based forwarding and autolearning
•
VLAN based forwarding
•
802.1Q VLAN add/remove/swap
•
Stacked VLAN (802.1Q format) add/remove/swap
•
Multicast/Broadcast
•
802.3x flow control
•
802.1Q Priority bits management for queuing, WFQ scheduling
•
Policing and bandwidth allocation
[3] Ethernet Mapping over SDH (GFP/LAPS)
Ethernet packets are encapsulated and mapped into SDH frames for transmission. Ethernet mapper
supports 16 independent channels for EOS (Ethernet Over SDH) encapsulation.
Each channel can be mapped with multi SDH containers with appropriate bandwidth, such as VC12,
VC12XV, VC3, VC3XV, VC4 or VC4XV (with local Gb Ethernet interface)
Both high order and low order concatenation are supported, moreover, virtual concatenation with LCAS
(Link Capacity Adjustment Scheme) provides customer with powerful dynamic bandwidth adjustment
scheme to fit various needs.
Basic feature list as follows:
•
Multi encapsulation mode supported:
– GFP Generic Framing Procedure (ITU–T G.7041)
– LAPS Link Access Procedure SDH (ITU–T X.86/X.85)
– BCP PPP Bridge Control Protocol (RFC 1662/2878)
•
Low order/High order Contiguous and Virtual Concatenation supported
•
XV Container supported:
According to the port configuration two different operation mode are available for ISA
ES–4–8FE as explained in the table below:
XV type
VC12–xv
VC3–xv
VC4–xv
The choice between SMII or GMII operation is made via Craft Terminal.
•
Differential delay compensation = 48 ms
ED
02
XV container supported
SMII operating mode
(x = 1 to 50)
(x = 1 to 2)
(x = 1 )
3AL 91669 AA AA
GMII operating mode
(x = 1 to 63)
(x = 1 to 12)
(x = 1 to 4 )
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