Table of Contents
Advertisement
C H A P T E R
3 :
S E T U P
3.1.3 D-Channel Configuration
The D-channel configuration setting is applicable only to ISDN PRI
protocols that support the NFAS and/or D-channel backup procedures. Only
the US variants NI2, DMS, 4ESS, 5ESS-9, and 5ESS-10 are supported, and
will be affected by this configuration. Table 3.1 lists the possible
combinations.
Trunk 1
Trunk2
Primary
Primary
Primary
NFAS
Primary
Backup
Table 3.1: PSTN Interface and Protocol Configuration for the E1/T1 interface board.
Note:
Currently only identical configuration setups of Trunk 1 and
Trunk 2 are possible. This is about to change in future
versions of the E1/T1 option.
3.1.4 Line Code
Selects the line code type to be used for the trunks. Two common types of
line coding are defined for E1, namely AMI or HDB3. For a T1 network
valid line code types are AMI or B8ZS.
3.1.5 T1 Framing Method
This parameter is applicable for T1 protocol types only. It specifies the
framing format used by the trunk. T1 and E1 delineate frames differently. In
the case of T1, either D4 framing (also known as SF or Super Frame) or ESF
(Extended Super Frame) is applicable. In the case of E1 protocols, there is
only one framing method defined.
3.1.6 CAS ABCD Idle Pattern
The CAS ABCD Idle Pattern is the pattern that will be used whenever a
channel is in idle state (at initialization - before opening the channel, or at all
times when it is closed). In the frame format for E1 and for ESF on T1, this
pattern consists of 4 bits – ABCD. When T1 with D4 frame format is used,
there are 2 bits relevant – AB. This parameter is relevant only when using
the E1/T1 interface with CAS protocols.
O F
T H E
E 1 / T 1
Description
Normal and default configuration for PRI protocols for 23
bearer channels and one CCS (Common Channel Signalling)
channel for each trunk.
NFAS mode using Trunk 1 carrying the CCS channel. This
trunk is also used to set-up calls for both trunks. Thus, Trunk 2
supports 24 bearer channels.
Backup mode using the first trunk's CCS has a primary
signaling channel setting up the calls for both trunks. The
second trunk supports 23 bearer channels and its CCS channel
is used as a back-up or stand-by channel. In the case of
malfunction, the second trunk changes roles with the 1
and becomes the primary span.
7
B O A R D
P A R A M E T E R S
st
span
Advertisement
Table of Contents
