Understanding Isdn Communication Protocols - NETGEAR XM128 ISDN Reference Manual

If the address-matching process is again unable to tell which protocol to use, the Model XM128
modem goes into the Multi Auto-answering Routine by examining the B channel data pattern and,
hence, determining the protocol to use.
When alerted, the Model XM128 modem sends a RING message to the DTE in the following
format:
RING
FM:17145522863TO:17142630398

Understanding ISDN Communication Protocols

Table 6-5 shows the specifications of different ISDN protocols.
Table 6-5. ISDN protocol specifications
Parameter
Layer 1
Layer 2
Layer 3
Error Control
V.42bis
Async or Sync if used
with V-Series DTE
Bundle
Max. Line Speed
AT-Command
Configuration
ISDN Overview
Reference Guide for the Model XM128 ISDN Digital Modem
V.110
80 Bits Framing
None
None
No
No
Async Only
No
Async: 38.4 Kbps
Sync: 64 Kbps
ATB10
V.120
HDLC
LAPD
V.120
Yes
Yes
Async Only
Yes
64 Kbps
128 Kbps
ATB20
X.75
HDLC
LAPB Transparent
ISO8208T.70 NL
Yes
Yes
Async Only
Yes
64 Kbps
128 Kbps
ATB00 Transparent
ATB01: T.70 NL
6-9