Mike's PBX Cookbook

UDT E1/T1 - Universal Digital Trunk card


The UDT E1/T1 replaces the NTAK79, NTAK09, NTAK10, NTBK50, and NTRB21. It is backwards compatible on small systems (all releases), and software transparent. DDCH/DCHI functionality is implemented onboard. It can be used in any of the following modes:

Use one Clock Controller (CC) daughter board per cabinet.
Put the UDT card in the first free slot nearest the MGC.


There are 3 steps to configuration:
  1. E1 or T1 mode - set by DIP switch 1 on the card: ON = E1 / OFF = T1.
    Insert the card. The EN/DIS LED remains red until the card is enabled in LD 60

  2. Configuration via CLI, with the command: udtadmin/E1T1Settings
    This is required for non default mode setup, although, always check if reconfiguring a used card.

    Default modes: E1 - PRI2, CRC4-no;
    T1 - PRI, ESF, B8ZS, FDL, LBO- 0-133 ft.
    Non-default modes: DTI2, DTI, DDCS, BCH, CRC4-yes.

  3. Call Server programing of route and trunks.
    Do not configure UDT E1/T1 as TMDI card! It's an MSDL.

    Call Server programing examples: E1 PRI Example, T1 DTI Example

For more information, refer to: ISDN Primary Rate Interface Installation and Commissioning NN43001-301

Configuration via CLI

Access to the CLI is via the serial interface (RS232 9-pin D) on the cards face plate.

UDT - MRV Pin-out

Only pins 2 (TXD), 3 (RXD) and 5 (GND) are connected. You may need a Null-Modem.
The communication settings are: 9600/8/n/1, no flow control.

If you're connecting the UDT card to an MRV, use the pin-out shown right:

When correctly hooked up, hitting enter will return a UDT [1 /] prompt.

In the following example, we will enable CRC4 on an E1 PRI2 circuit:

UDT [1 /]  udtadmin/E1T1Settings
E1/T1 Settings:
Protocol: E1
CRC4: No
Modify, Save, Cancel: m

Protocol E1

Usage (PRI2, 1-BCH, 2-DTI2, 4-DDCS ):

CRC4 (No, 1-Yes ):1
New E1/T1 Settings:
Protocol: E1
Usage: PRI2
CRC4: Yes
Modify, Save, Cancel: s

With the DIP switch set to T1, the menu is different, set below is: DTI, ESF, B8ZS:

DT [1 /] udtadmin/E1T1Settings
E1/T1 Settings:
Protocol: T1
Frame Mode: ESF
Line Code: B8ZS
Yellow Alarm: FDL
LBO: 0..133ft
Modify, Save, Cancel: c
UDT [2 /]

The available directories are:

smaint- System Maintenance directory
udtadmin- UDT Administration directory
udtmaint- UDT Maintenance directory

You can type help, or ? in each directory for a list of commands.
We need to go to the udtadmin directory to change the E1T1Settings:


NTBK65 UDT RJ48C breakout adaptor

Media Gateways (and Option 11's) can use a NTBK65 adapter, or a direct MDF connection. See Connecting E1 / T1's for wiring details.

If you can't find an NTBK65 UDT RJ48C breakout adaptor (right), use pairs 23 (TX) and 24 (RX) on the MDF. If the circuit doesn't go green, just swap the TX/RX pairs.

Note: An RJ-48 is a keyed RJ-45. An RJ-45 connector will fit an RJ-48 jack, but the key on an RJ-48 connector will prevent it from plugging into an RJ-45 jack.

UDT card firmware upgrade

It may be necessary to patch UDT cards following a loadware upgrade. Before doing so, disable the MSDL in LD96 and the loop in LD60. Use the following Load 143 UDT firmware upgrade commands:

  • UPGUDT STAT  - Query current UDT card firmware upgrade status.
  • UPGUDT l s c - Perform UDT card firmware upgrade on [supl shelf card]
  • UPGUDT ABORT - Abort UDT card firmware upgrade.
  • NOTE: Make sure that the MGCs are fully registered to the Security Domain before attempting a loadware upgrade. If necessary, regenerate the Secure FTP token from UCM and then start the upgrade again. If the upgrade fails, it may be necessary to:

    1. Cold start both CS cores while split.
    2. Unregister and register both CS to the Security Domain.
    3. Confirm using Regenerate Now button on Secure FTP page within UCM.
    4. Join the cores.

    Further details on patching, see: Load Patch procedure.

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