Link Capacity Adjustment Scheme (LCAS)
The EPL4_E132_75 option card supports a flexible allocation of SDH bandwidth to
LAN ports by making use of the Link Capacity Adjustment Scheme (LCAS, see
). All LAN ports have the same capabilities. Each WAN port
supports VC-12-Xv (X = 1...63), VC-3-Xv (X = 1...9), VC-4-Xv (X=1..7).
The EPL_4_E132_75 option card is able to compensate a maximum delay difference of
128 ms between the fastest and the slowest VC in receive direction.
GFP encapsulation
GFP provides a generic mechanism to adapt traffic from higher-layer client signals
over a transport network. GFP encapsulation is implemented according to
T1X1.5/2000-147.
The following GFP encapsulation are possible with EPL4_E132_75:
•
Mapping of Ethernet MAC frames into Lower Order SDH VC12–Xv (X = 1...63)
•
Mapping of Ethernet MAC frames into Lower Order SDH VC3–Xv (X = 1...9)
•
Mapping of Ethernet MAC frames into Higher Order SDH VC4–Xv (X=1..7)
LAPS encapsulation is implemented according to ITU-T X.86.
Advanced rate control
The EPL4_E132_75 option card supports advanced rate control in the ingress and
egress direction which allows to set a strict traffic limit (PIR), in combination with a
hold-off mechanism: Excess traffic is held off until the ingress or egress buffer
FAIL
33
34
Lucent
1
4
EPL4_E132_75
2
8
3
2
35
36
E/FE
E/FE
Product description
Introduction
....................................................................................................................................................................................................................................
365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
2-19
