參數(shù)資料
型號： PM5372-BI
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁數(shù)： 142/169頁
文件大?。?/td> 989K
代理商： PM5372-BI
TSE Transmission Switch Element Datasheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1991258, Issue 7
142
12.12 Synchronized Control Setting Changes
The TSE supports dual switch control settings. These dual settings permit one to be operational
while the other is updated as a result of some new connection requests. The CMP input selects the
current operational switch control settings. CMP is sampled by the TSE on the base timing pulse
t.
The internal blocks sample the registered CMP value as they receive the next J0 character –at
least a delay of RJ0DLY. The new CMP value is applied on the first A1 character of the second
following STS-12 frame. This switchover is hitless; the control change which does not disrupt the
user data flow in any way. This feature is required for the addition of arbitrary new connections,
as existing connections may need to be rerouted (see the discussion of the connection routing
algorithm in this document).
12.13 Fabric Rules of Composition.
There are rules governing how the TSE, the TBS, the Load devices (SPECTRA-2488,
SPECTRA-4X155, and S/UNI-MACH48), can be combined to form legal fabrics. A hypothetical
Load device with an on-board TBS is also considered. This section describes the interconnecting
buses, gives a behavioral description of the four components, lists the rules of composition for
fabric formation, and gives several examples of legal fabrics.
12.13.1 Interconnections
The various components communicate via two full-duplex channel types: Parallel TelecomBuses
(P-TCB) and Serial TelecomBuses (S-TCB). The S-TCBs are always point-to-point. The P-
TCBs can be either point-to-point, or can be combined with one stage of wired-or multiplexing.
Both buses carry 4*STS-12 = STS-48 streams (i.e., they can be thought of as a single STS-48
flow, or as four independent STS-12 flows – the TSE will always treat each STS-1 independently
in any case.) In the diagrams below, P-TCBs are drawn as heavy directed arrows; S-TCBs are
drawn as lighter arrows.
12.13.2 Behavioural Descriptions of Components
Load:
Load devices (SPECTRA-2488) have one full-duplex P-TCB port. We ignore the line
side of these devices. Loads are represented in Figure 15.
TBS:
TBS devices have one P-TCB port and three S-TCB ports. The TBS can take any of 3*48
STS-1s from the ingress S-TCBs and place it in any of 48 STS-1 slots in the egress P-TCB. In
the other direction, the TBS can fill any of the 3*48 egress S-TCB slots with any STS-1 taken
from the ingress P-TCB.
TSE:
TSE devices have 64 full-duplex S-TCB ports. The TSE implements a full
Time:Space:Time switching function, as described in this document.
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