Huawei AR1200 Series - Page 115

The S/T interface on the 2BST provides a rate of 192 kbit/s, including 144 kbit/s for data
transmission and 48 kbit/s for maintenance information transmission.
Table 5-73 lists the number of interfaces on the 1BST and 2BST.
Table 5-73 Number of interfaces on the 1BST and 2BST
Card
Name
User
Interface
Usage
Scenario
Mode Feed Supported
1BST One S/T
interface
Data services TE No
2BST Two S/T
interfaces
Voice services NT -40 V feed
NOTE
l TE: terminal equipment
l NT: network termination
2BST cards have two types: SIC and WSIC. Table 5-74 lists the slots where the SIC card and
WSIC card are installed.
Table 5-74 Slots of 2BST SIC and WSIC cards
Card
Slot
2BST (SIC) SIC slot
2BST (WSIC) WSIC slot or XSIC slot
NOTE
In an XSIC slot, the WSIC card is installed in the lower part
of the slot. The WSIC card uses the XSIC slot ID as its own
slot ID.
Functions and Applications
Functions
The 2BST has the following functions:
l Provides two ISDN S/T interfaces for voice access.
l Implements NT mode.
The 2BST consists of the following modules:
l CPU control module: manages the system and loads programs.
l CPLD logic module: provides the working clock and reset signals for the chip, controls the
line -40 V feed, controls the service port status, and monitors the board clock.
Huawei AR1200&2200&3200 Series Enterprise Routers
Hardware Description 5 Cards
Issue 03 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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