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interface layer 1 adaptation protocol without error-control and is
thus inadequate for V.42bis.
Bundle Connection with V.42bis Data Compression
If both sites have set AT&K44 to enable V.42bis negotiation then
XID frames will be exchanged through the main B channel which
corresponds to the call established by the first SETUP message.
Only one data compression channel will be used in bundle
connections. That means the compression is done before packet
disassembly and the decompression is done after packet assembly.
The compression ratio of V.42bis is commonly recognized as up to
4:1 for text files. If the line speed is 128K bps, then the DTE speed
may reach 512K bps. This makes the DTE's normal RS-232 serial
port unsuitable for bundle applications. A special I/O card on the
computer side is required in this situation.
Selecting V.120 for European ISDN (DSS1)
With European ISDN, V.120 is an option in the Bearer Capability
(BC) information element, which is a mandatory information
element in the SETUP message. Although we can specify V.120 in
the Low-Layer-Compatibility (LLC) information element, some
switches just don't deliver the LLC. Other switches do deliver the
LLC, but the V.120 selection will be discarded midway.
If the called TA doesn't get any B channel protocol information
from the incoming SETUP message and the remote device is a
ZyXEL ISDN device, the TA128 will be able to identify the V.120
protocol automatically with the Multi Auto-answer routine.
Otherwise, the handshake will fail.
- Omni TA128 1
- User’s Manual 1
- ZyXEL Limited Warranty 2
- FCC Part 15 Information 3
- Contacting ZyXEL 5
- Table of Contents 7
- 1 Introduction 13
- Key Features of the TA128 14
- Technical Specifications 15
- Physical Characteristics 15
- Unpacking Your TA128 16
- 2 Installing your TA128 17
- U Interface Model 20
- Power On and Self Diagnostics 21
- TA128 Front Panel 22
- Front Panel Switch 23
- 3 Configuring Your ISDN 25
- AT<Enter> 26
- ATI<Enter> 26
- ATI1<Enter> 27
- 4 ISDN Communication 29
- Supported AT command types: 30
- Outgoing Calls 31
- ATS83.7=1<enter> 32
- ATS83.7=0 <enter> 32
- ATDA17146930762<enter> 32
- ATDB17146930762<enter> 32
- Incoming Calls 33
- Digital Data 34
- Determining the Packet Length 34
- Answering a Call using MSN 35
- Data over Speech Channel 36
- Best-effort call answering 37
- 5 Setup for Windows 95 39
- Networking 43
- CAPI Installation 47
- 6 Point-to-Point Protocol 49
- Feature list 50
- Authentication conversion 51
- Multilink PPP 52
- Call bumping 53
- Bandwidth On Demand (BOD) 54
- BACP/BAP 54
- 7 V.110 and Synchronous 57
- Making V.110 Calls 58
- Synchronous Connections 58
- V.25bis Command Set 59
- DTR Drop-Dialing Operation 60
- 8 V.120 ISDN 63
- Configuring the V.120 mode 64
- Answering incoming calls 65
- Speeds of 128Kbps 66
- 9 X.75 ISDN 71
- Answering an X.75 call 72
- Making an X.75 Call 72
- 10 Handling Analog Calls 77
- Accepting an Incoming Call 79
- Feature Phone 81
- InterCom 82
- Call Waiting 82
- Placing a second call 82
- Receiving a second call 82
- Call Broker 83
- Call Reject 83
- Call Transfer 84
- Three-way Conference Call 84
- 11 Advanced ISDN Call 86
- AT&ZOx=s. The 88
- Answering a Call 92
- Answering a Call for 1TR6 93
- Best-effort Call Answering 94
- Data Call Indication 95
- Placing a Call 96
- Placing a call for DSS1 97
- Leased Line ISDN 98
- 12 Security Functions 100
- Level 1 security 101
- Level 2 security 101
- Level 3 security 101
- AT*HCn=xxxx, - n=0,1,..,4 104
- 13 Upgrading Your TA128 106
- Kernel Mode 107
- 14 DTE Port 2 108
- Configuring DTE Port 2 109
- Setting of DTE port 2 Speed 114
- DTE Port 2 Call Control 115
- 15 Diagnostics 116
- The Diagnostic Command (ATCG) 118
- Resetting The TA128 119
- Capturing the Protocol Data 120
- Analyzing the Captured Data 121
- 16 AT Command Set 124
- AT Command Descriptions 125
- Description of ATI3 Output: 133
- 17 Status Registers and 142
- Setting S-registers 143
- S-Register Descriptions 145
- ATS35.7=1<enter> 167
- 18 Phone Jack Pinout 168
- 4. Not Connected 169
- 19 Serial Port Interface 170
- 65-020-128006 173
- ZyXELZyXEL Communications Co 173
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