ZyXEL Omni TA 128 User Guide - Page 63

V.120 ISDN, Communications

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8 V.120 ISDN Communications This chapter describes how to set-up and configure your TA128 with the V.120 ISDN protocol. The table below shows the specifications of different ISDN protocols: Layer 1 Layer 2 V.110 80 Bits Framing None Layer 3 Error Control V.42bis Async or Sync if used with VSeries DTE Bundle Max. Line Speed AT-Command Configuration None No No Async Only No Async: 38.4 Kbps ATB10 V.120 HDLC X.75 HDLC LAPD V.120 Yes Yes Async Only LAPB Transparent ISO8208T.70 NL Yes Yes Async Only Yes 64Kbps 128Kbps ATB20 Yes 64Kbps 128Kbps ATB00 Transparent ATB01: T.70 NL Placing outgoing calls Some switches transmit all network signals through the D channel (out of band signaling), allowing both B channels to be used exclusively for your communication purposes. This allows for throughput of 64Kbps per channel. However, not all switches support out-of-band signaling at this time. For switches that do not 51

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51
8
V.120 ISDN
Communications
This chapter describes how to set-up and configure your TA128
with the V.120 ISDN protocol. The table below shows the
specifications of different ISDN protocols:
V.110
V.120
X.75
Layer 1
80 Bits
Framing
HDLC
HDLC
Layer 2
None
LAPD
LAPB
Transparent
Layer 3
None
V.120
ISO8208T.70 NL
Error Control
No
Yes
Yes
V.42bis
No
Yes
Yes
Async or Sync
if used with V-
Series DTE
Async Only
Async
Only
Async Only
Bundle
No
Yes
Yes
Max. Line
Speed
Async: 38.4
Kbps
64Kbps
128Kbps
64Kbps
128Kbps
AT-Command
Configuration
ATB10
ATB20
ATB00
Transparent
ATB01: T.70 NL
Placing outgoing calls
Some switches transmit all network signals through the D channel
(out of band signaling), allowing both B channels to be used
exclusively for your communication purposes. This allows for
throughput of 64Kbps per channel. However, not all switches
support out-of-band signaling at this time. For switches that do not