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Updated:March 2, 2020
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This document provides an introduction to the Network Interface Modules (NIM) on the newest generation of Cisco routers and how to set them up. It also covers the new configuration of Primary Rate Interface (PRI) circuits and clocking on this new platform.
The Cisco Integrated Services Routers (ISR) 4000 Series are available in these models:
The sections in this documentation apply to all platforms unless explicitly stated otherwise. The document talks about PRI configuration on these platforms and common issues faced.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware versions.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Cisco IOS® XE Release 3.9S and higher supports Cisco's Fourth-Generation T1/E1 Voice and WAN NIM, which are needed in order to configure voice or data over T1/E1.
The list of available Cisco T1/E1 NIMs are as follows:
1-port multi-flex trunk voice/clear-channel data T1/E1 module
2-port multi-flex trunk voice/clear-channel data T1/E1 module
4-port multi-flex trunk voice/clear-channel data T1/E1 module
8-port multi-flex trunk voice/clear-channel data T1/E1 module
1-port multi-flex trunk voice/channelized data T1/E1 module
2-port multi-flex trunk voice/channelized data T1/E1 module
8-port multi-flex trunk voice/channelized data T1/E1 module
The NIM cards are supported only on the Cisco ISR 4000 Series. The NIM Multiflex Trunk (MFT) modules use only Packet Voice Digital Signal Processor Module 4 (PVDM4) Digital Signal Processors (DSPs). The older PVDM2s and PVDM3s are not supported on these platforms.
When the NIM is used for voice applications, all voice T1/E1s have to be synchronized to a single clock source and any difference in clocks risk clock slips or interface flaps. When the NIM is used for mixed data and voice applications, each data port can use an independent clock and the voice ports can use a clock source independent from the data ports.
Network synchronization is supported for NIMs when you enter the network-clock synchronization automatic command in global configuration mode. This command is made ineffective for a particular NIM if you enter the no network-clock participation slot / subslot command. The network-clock input-source priority controller [t1|e1] slot/bay/port command is used in order to configure the primary clock source.
You can enter the show network clocks synchronization command in order to check the network clocks on the router and the show platform hardware subslot 0/2 module device networkclock command in order to verify if a module participates in backplane clock.
The Cisco PVDM4 is installed on a slot on the motherboard or on a Cisco Fourth-Generation T1/E1 Voice and WAN Network Interface Module.
Note: ISR 4461 does not have any motherboard slots
The PVDM4 comes in different flavors.
32-channel, high-density, voice DSP module
64-channel, high-density, voice DSP module
128-channel, high-density, voice DSP module
256-channel, high-density, voice DSP module
This is a list of the number of channels supported on the various flavors of the PVDM4 categorized by the complexity of the codecs that are supported.
Unlike previous generations of PVDM2 and PVDM3 DSP modules, the PVDM4 modules are installed directly on the T1/E1 NIMs. Dependent upon the number of channels required, the appropriate DSP module is installed on the NIM.
TDM Voice Services
Media Services (Transcoding, Conferencing, etc.)
DSPs on Analog NIM (FXO/FXS)
Fixed on NIM Module
PVDM4 DSPs on T1/E1 NIM
PVDM4 DSPs on SM/Motherboard Slot
Note: PVDM2 and PVDM3 DSP modules are *NOT* supported on the ISR 4000 series platforms
Software License Requirements
Voice applications require a minimum of the Unified Communications Technology Package. The Cisco 4400 Series has a software package that is similar to that of the ISR G2, which is Right-To-Use (RTU), also known as honor-based.
After 60 days, an evaluation license automatically converts to an RTU license. At that point, it is expected that an RTU license will be purchased for that feature on that platform. This model is the same as that for the ISR G2.
There is currently no verification procedure available for this configuration.
Use this section in order to confirm that your configuration works properly.
When you try to configure voice PRI on ISR G4, this error appears:
================== T1 0/1/0: No DSP resources to configure voice feature ==================
There is only one PVDM slot on the motherboard. The Time Division Multiplexing (TDM) cards can not use the motherboard PVDMs. Dependent upon the number of channels required, the appropriate DSP module is installed on the NIM. For IP services such as to transcode and conference, the PVDM4 DSP module can be installed on the motherboard of the ISR 4000 Series platform.
If the show inventory output shows this information, it signifies that the PVDM card is installed on the motherboard.
The T1 module has no DSP as per the show inventory command, but this configuration worked:
controller T1 0/2/0 pri-group timeslots 1-24 service mgcp
isdn bind-l3 ccm-manager
This is a known issue documented in Cisco bug ID CSCuo86715. On all the Cisco IOS-XE Releases earlier than 15.4(3)S1, the previous commands are accepted, even if DSPs are not available on the NIM. Release 15.4(3)S1 has this issue fixed and the user is prompted with the "T1 0/2/0: No DSP resources to configure voice feature" error message if there are no available DSPs on the NIM.
How should the PVDM 4 be installed on a NIM? Are the PVDM4s hot swappable?
There are two places where PVDM4 DSPs are installed. For TDM services, the DSP is installed on the T1/E1 NIM. Since the NIMs support online insertion and removal (OIR) they can be removed without powering down the ISR 4000 Series device, and the DSPs on the NIM can be removed. However, the router must be shut down in order to insert or remove a PVDM4 on the motherboard. Follow this schematic representation in order to install the PVDM4 on NIM.