The Huawei FA16 CB02VFB board is a 16-channel general audio interface board that provides 2-wire/4-wire audio voice path and connection to audio leased line MODEMs and other functions. Each board has 16 2-wire audio interfaces or 8 4-wire audio interfaces, and the board is compatible with common user board slots.
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Huawei FA16 Railway Common Audio Interface Board (CB-VFB Board)
Figure 2 VFB single-board schematic diagram
The basic principle of the VFB single board is described as follows:
The codec completes A/D conversion, partial impedance matching, receive-transmit gain adjustment, and terminal balanced return loss adjustment.
The user circuit mainly completes the two/four-wire conversion and impedance matching functions.
The CPU controls the codec and communicates with other boards through the serial port.
FA16 CB02VFB Panel Description
Table 1 VFB panel and description
| ||
RUN: Running status indicator | ||
Red light 0.25s on 0.25s off cycle blinking | Veneer startup | |
Red light 1s on 1s off cycle blinking | VFB is working normally | |
External Interface
VFB interfaces are distributed on the backplane of the single board or the corresponding adapter board, and the interface descriptions are shown in Table 2.
Table 2 VFB interface description
Interface | Function | Position | Connection Description |
|---|---|---|---|
16 2-wire audio interfaces or 8 4-wire audio interfaces | Audio User Access | Backplane (rear maintenance frame) | Connects to the patch panel using 32-way user cables (ports 0 to 7, 24 to 31). |
SLTF (front maintenance frame) | Use 32-way user cables (0 to 7, 24 to 31 ports) to connect to the patch panel. |
FA16 VFB DIP Switch Settings
The VFB provides eight dip switches, S011, S031, S051, S071, S091, S111, S131, and S151, as shown in Figure 3.
Figure 3 Schematic diagram of VFB dipswitch layout
DIP switches S011 to S151 are used to set the impedance of the 16 2-wire audio interfaces, and the setting instructions are shown in Table 3.
Table 3 FA16 VFB DIP Switch Setting Description
DIP Switch | Setting | Meaning | Factory setting |
|---|---|---|---|
S011-1 | ON | Port 1 adopts 600Ω impedance. | ON |
OFF | Port 1 adopts 1650Ω impedance. | ||
S011-2 | ON | Port 2 adopts 600Ω impedance. | ON |
OFF | Port 2 adopts 1650Ω impedance. | ||
S031-1 | ON | Port 3 adopts 600Ω impedance. | ON |
OFF | Port 3 adopts 1650Ω impedance. | ||
S031-2 | ON | Port 4 adopts 600Ω impedance. | ON |
OFF | Port 4 adopts 1650Ω impedance. | ||
S051-1 | ON | Port 5 adopts 600Ω impedance. | ON |
OFF | Port 5 adopts 1650Ω impedance. | ||
S051-2 | ON | Port 6 adopts 600Ω impedance. | ON |
OFF | Port 6 adopts 1650Ω impedance. | ||
S071-1 | ON | Port 7 adopts 600Ω impedance. | ON |
OFF | Port 7 adopts 1650Ω impedance. | ||
S071-2 | ON | Port 8 adopts 600Ω impedance. | ON |
OFF | Port 8 adopts 1650Ω impedance. | ||
S091-1 | ON | Port 9 adopts 600Ω impedance. | ON |
OFF | Port 9 adopts 1650Ω impedance. | ||
S091-2 | ON | Port 10 adopts 600Ω impedance. | ON |
OFF | Port 10 adopts 1650Ω impedance. | ||
S111-1 | ON | Port 11 adopts 600Ω impedance. | ON |
OFF | Port 11 adopts 1650Ω impedance. | ||
S111-2 | ON | Port 12 adopts 600Ω impedance. | ON |
OFF | Port 12 adopts 1650Ω impedance. | ||
S131-1 | ON | Port 13 adopts 600Ω impedance. | ON |
OFF | Port 13 adopts 1650Ω impedance. | ||
S131-2 | ON | Port 14 adopts 600Ω impedance. | ON |
OFF | Port 14 adopts 1650Ω impedance. | ||
S151-1 | ON | Port 15 adopts 600Ω impedance. | ON |
OFF | Port 15 adopts 1650Ω impedance. | ||
S151-2 | ON | Port 16 uses 600Ω impedance. | ON |
OFF | Port 16 adopts 1650Ω impedance. |
This product technical parameters and product characteristics by Shenzhen Guihang Network Technology Co., Ltd (www.opticaltrans.com), reproduced please retain. Huawei SDH Optical Transmission Equipment,SDH Transmission Equipment Sales Tel: 18529092692 Welcome to call us!
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