Comdial Dxp Plus Instructions Manual

4.4 Requesting Information On Switch Settings
You can determine how particular DIP switches on the DXPT1 board are set by using one of the
following requests. Depending on which request you make, the system supplies you with the following
information:
·DIP switch settings for SW1,
·DIP switch settings for SW2,
·DIP switch settings for LIU.
4.4.1 Requesting Information On DIP Switch Settings
Set the diagnostic DIP switches as shown in the following table. Switch 1 is the top switch. When the
switch is...

4.5 Requesting AB Signalling
When you use this request, you are asking the system to reveal the A and B bits. Upon making the AB
signalling request, the system supplies you with the following information:
·A bit transmitted to the CO,
·B bit transmitted to the CO,
·A bit received from the CO,
·B bit received from the CO.
4.5.1 Setting The DIP Switches To Request AB Signalling
Set the DIP switches as shown in the following table. Switch 1 is the top switch. When the switch is
moved to the right, it is...

4.6 Requesting Information On Trunk Assignments
Make this request to receive information on the trunk assignments that have been made. Upon making
this request, the system provides you with the following information:
·trunk type (ground start, DID, E&M, or loop start),
·dial type (rotary or tone),
·signalling protocol (immediate, wink, delay).
4.6.1 Setting The DIP Switches For Requesting Trunk Assignment Information
Set the DIP switches as shown in the following table to request trunk assignment...

4.7 Requesting Information About Channel State
Use this request to determine the state of the channel specified in the request command. Upon making this
request, the system provides you with the following information:
·channel state (idle or busy).
4.7.1 Setting The DIP Switches For Requesting Channel State Information
Set the DIP switches as shown in the following table to request the state of the channel specified in the
request command. Use switches 4 through 8 (designated in the table by A through E)...

4.8 Using The Hexadecimal Codes For Remote Diagnostics
You can similate the diagnostic DIP switch settings, that are usually made on-site, by sending the
following code sequence via modem to the remote DXPT1 board:
tkmsg(valid port number)7B,(hex code)
The hexadecimal value that you use for the field code corresponds to a bit pattern that you are using to
similate DIP switch settings. For example, to similate a switch setting of 11100001 (switches 1, 2, 3, and
8 on) use hex code E1 in the field position....

5 Selecting The T1 PAD Settings
The system pad settings that you select through the DXPPlussystem programming are very important for
the correct audio level to be transmitted and received and for echo suppression.
5.1 Setting T1 Transmit Level
For the older software, set tonormal(uses low, very-low, normal, high, very-high settings). For software
using Gain1, Gain2, Nominal, Loss1, Loss2, Loss3, Loss4, and Loss5, useNominalsetting.
5.2 Setting T1 Receive Level
For the older software, set to Very-Low. For...

A. Appendix A
Appendix  A consists of two tables showing superframe and extended superframe format. The
information for these tables is from the American National Standards Institute (ANSI) specification
T1.403-1989.
Table 2. Superframe Format
Bit Use In Each signalling Bit
F Bits Time Slot Use Options
Frame
Number Bit Term Signal Traffic SignalT T signalling
Number Frame Frame Channel
(F
1)(F2)
1 0 1 — 1-8 — — —
2 193 — 0 1-8 — — —
3 386 0 — 1-8 — — —
4 579 — 0 1-8 — — —
5 772 1 — 1-8 — — —
6 965 — 1...

Table 3. Extended Superframe Format
Bit Use In Each signalling Bit
F Bits Time Slot Use Options
Frame
Number Bit FPS DL CRC Traffic Signal T 2 4 16
Number
1 0 — m — 1-8 — — — — —
2 193 — — C
11-8 — — — — —
3 386 — m — 1-8 — — — — —
4 579 0 — — 1-8 — — — — —
5 772 — m — 1-8 — — — — —
6 965 — — C
21-7 8 — A A A
7 1158 — m — 1-8 — — — — —
8 1351 0 — — 1-8 — — — — —
9 1544 — m — 1-8 — — — — —
10 1737 — — C
31-8 — — — — —
11 1930 — m — 1-8 — — — — —
12 2123 1 — — 1-7 8 — A B B
13 2316 — m — 1-8 — — — — —
14...

Understanding The System Diagnostics
for the
DXP Plus Digital Communications System
1.0 Introducing System Diagnostics
The digital communications system provides you with the option of doing several different types of diagnostic
checks on the system. This publication details the types of diagnostics and their functions.
NOTE: You should perform all diagnostic tests on an idle system and under the direction of a Comdial technician.
A busy system could produce invalid test results. Because there are...

2.0 Defining System Diagnostics
2.1 Initialize Diagnostic Data
This option clears all previous diagnostic test results from memory.
2.2 ROM Checksum Verification
The ROM checksum test calculates and displays a checksum to test the integrity of the system software builds
(located in the flash ROM).
If the system passes the test, it displaysPassedon the screen. If the system fails the test, it displaysFailed
along with the expected and actual checksum value.
2.3 Scratch RAM Test
This test checks the...