Analysis:
NM refers to the network module.
It is the network module (NM) of Cisco 2600, 2800, 3600, 3700 and 3800 series, and it is also the common problem of the high-density analog (NM-HDA) voice/fax network module of Cisco 2600, 2800, 3600, 3700 and 3800 series access routers.
abstract
Cisco 2600/2800/3600/3700/3800 series multi-service platforms are designed to provide large enterprises and service providers with solutions that can improve flexibility and integrate voice and data applications. The high-density analog network adapter (NM-HDA) can provide analog voice port density up to 8FXO+4FXS or up to 12FXS+4FXO. Different components can support different FXS and FXO port combinations. The following "Configuration Information" section will detail the specific configurations supported by these platforms-they do not support all possible combinations.
The NM-HDA itself includes four FXS ports and two 5421DSPs. In addition, NM-HDA also provides two expansion module (EM) slots, which can install 4-port FXO module or 8-port FXS module or use DSP expansion module.
Q: What is nano HDA-4FXS?
Answer: It is a network module (NM) of Cisco 2600, 2800, 3600, 3700 and 3800 series, which supports voice connection of at most 8 FXO FXS or at most 12 FXS+4 FXO ports. The NM itself contains a 50-pin RJ-2 1 connector, four FXS ports and two 5421DSPs. NM has two expansion slots, and 4-port FXO and 8-port FXS modules can be added, or a DSP expansion module can be added. The following figure shows these different components:
Figure 1
Q: Which platforms can support nano-HDA?
A: All platforms of Cisco 2600, 2800 (except 2801), 3600 (except 3620), 3700 and 3800 series.
Q: What is the design purpose of nano HDA?
Answer: Provide high-density analog voice gateway for the following applications:
Enterprise and manageable service applications
Branch fax machines and telephones
Analog PBX and keying system, so when more than 4 analog ports are needed, there is no need to upgrade the existing telephone equipment.
Low-cost analog telephone connections of branches enable them to conduct voice transmission and join the network controlled by Cisco CallManager.
Provide analog PSTN connection for branches with IP phone and SRST functions.
ITSP emulates FXO gateway.
Q: What components can be used on NM-HDA?
A: The following components can be used:
The basic NM supports four FXS ports and two 5421DSPs.
Two expansion cards on NM are available for installation:
8-port FXS expansion module
4-port FXO expansion module
You can also install a DSP extension module with two additional DSPs.
Q: When should I use NM-HDA instead of NM-HD- 1V/2V?
A:
If the current and expected requirements are as follows, NM-HD- 1V/2V should be used:
Up to 8 FXS or FXO, or a combination of both (up to 8 ports)
Any number of simulated DID, e &；; M or BRI connection
The length of FXO loop (that is, the line length between FXO module and central office) exceeds 8000 feet.
If the total number of FXS and/or FXO ports exceeds 8, NH-HDA should be used.
Voice function
Q: What voice functions does NM-HDA support?
A: Nano HDA supports the following functions:
High complexity and medium complexity codecs-the same codec combination as supported by NM-HDV.
High complexity codecs include: g.7 1 1A-law, g. 7 1U-law, g.726 32k, g.726 24k, g.726 16k, g.728, g.
The codecs with medium complexity are: g.7 1 1A-law, g. 7 1U-law, g.726 32k, g.726 24k, g.726 16k, g.729a
By installing two 4-port FXO modules with two expansion slots, up to 8 FXO ports can be supported.
It can support up to 12 FXS ports by using four FXS ports on the basic NM and installing an 8-port FXS module with expansion slots.
VoIP H.323, SIP and MGCP with call proxy
VoIP MGCP with CM and H.323
VoFR
Voatm: VOA al 5 and relay VoAAL2
Caller ID support
FXO response and disconnection monitoring, and battery reverse disconnection
FXO power failure recovery
Same voice functions as NM-HDV and NM- 1V/2V (such as VAD, echo cancellation, DTMF relay, etc. ).
Q: How many calls can a DSP on the basic NM support?
A: Up to 8 calls with high complexity, or 16 calls with medium complexity (12 FXS and 4 fxos). If you need to support more than 8 complex calls, you need to use DSP EM.
Q: What kind of battery reverse function can FXO port support?
Answer: FXO EM supports all the functions of VIC-2FXO-M 1, VIC-2FXO-M2 and VIC-2FXO-M3, so it can be used in any country. (Please check the audit status of a specific country)
Q: What is FXO power failure recovery?
A: FXO power failure recovery is a built-in hardware function of FXO card. When the power supply of the router containing NM-HDA fails, this function can enable the connection with the analog telephone connected to the appropriate line pair through the relay. This allows users to make PSTN calls through special "emergency" phones in the office with the help of FXO lines that are usually connected to routers when power is cut off. For FXO EM located in slot 0 of NM-HDA, the analog phone must be connected to the pair 14 (counting from 1 on RJ-2 1 connector) to use the FXO power failure recovery function. For FXO EM located in slot 1 of NM-HDA, analog phone must be connected to pair 24 (counting from 1 on RJ-2 1 connector) to use FXO power failure recovery function. If both EMs have FXO modules installed, you can use two "emergency" phones.
configuration information
Q: What port configuration module combinations does NM-HDA support?
A: The following combinations are supported:
4 FXS: only basic NM is used.
12 FXS: 4 FXS are located on the basic NM, and 8-port FXS EM is used.
4 FXS+4 fxos: 4 FXS are located on the basic NM, and 4-port FXO EM is used.
4 FXS+8 fxos: 4 FXS are located on the basic NM, and two 4-port fxoems are used.
12 FXS+4 FXO: 4 four FXS are located on the basic NM, using 8-port FXS EM and 4-port FXO EM.
Q: how to set the port numbers of basic NM and EM?
A: Port numbers are statically assigned to slots in NM-HDA-they do not change with the type of module inserted. The x below represents the Cisco 26/28/36/37/3800 chassis slot where NM-HDA is located:
Basic -4 port: x/0/0-x/0/3
EM (left) -8 port in slot 0: x/0/4-x/0/ 1 1.
Em in slot 1-8: x/0/14-x/0/21.
The EM slot is assigned 10 port numbers, but only the last 4 (FXO) or 8 (FXS) can be used. Note: The middle bit of the NM-HDA port number is always 0.
Q: What is the serial number of the FXO power recovery port when the emergency phone is connected?
Answer: If counting from 0, port 13(EM in slot 0) and/or port 23(EM in slot 1). If you start counting from 1, it is the line pair 14 and 24.
limit
Q: NM-HDA supports E &；; M mouth?
A: No.
Q: Does NM-HDA support BRI port?
A: No.
Q: Does NM-HDA support analog DID port?
A: No.
Q: Can NM-HDA install 20 FXS ports? Why is this configuration not listed in the configuration information?
A: If 20 ports are enabled at the same time, NM-HDA cannot provide enough driving power. Therefore, NM-HDA does not actually support this configuration. The maximum configuration it supports is 16 ports (12 FXS+4 fxos).
Q: What are the limitations of nano HDA?
A: NM-HDA has the following restrictions:
The loop length (that is, the line length between FXO module and central office) shall not exceed 8000 feet.
The middle bit of NM-HDA port number is always 0.
The number of EM ports is not continuous. Each EM is assigned 10 port numbers, but only the last 8 can be used.
NM-HDA can only use nm's own DSP (basic or EM). AIM-VOICE-30 or AIM-ATM-VOICE-30 cards cannot be used for DSP expansion.
Analog-to-digital cross connection (D&; However, you can use POST-POST peer-to-peer dialing to route calls from analog ports to digital ports.
Q: Do you support modulus addition and subtraction (cross connection)?
A: No.
Q: How many nm-hda can each platform support?
A: See the table below:
Table 1:
Maximum number of nanometer HDA supported by the platform.
2600/2600XM/269 1 1
28 1 1/282 1/285 1 1
3640/A 3
3660 6
3725 2
3745 4
3825 2
3845 4
Q: Can all ports be disconnected at the same time in all configurations?
A: Yes.
Q: Does FXO port of NM-HDA support the monitoring of answering and hanging up tones?
A: Yes.
Cisco IOS Version Support and Memory Requirements
Q: What is the minimum version of Cisco IOS software that supports NM-HDA?
A: See the table below:
Table 2:
Cisco 2600/3600 Cisco 269 1/2600xm/3700 Cisco 2800 Cisco 3800
NM-HDA-4FXS 12.2(2) or12.2 (8) t12.2 (8) t12.3 (8) t 412.3 (/kloc)
EM-HDA-8FXS 12.2(2) or12.2 (8) t12.2 (8) t12.3 (8) t 412.3 (/kloc
EM-HDA-4FXO 12.2(2) or12.2 (8) t12.2 (8) t12.3 (8) t 412.3 (/kloc)
HDA 16 12.2(2) or12.2 (8) T412.3 (16544
Q: Which Cisco IOS feature set can support NM-HDA?
A: All additional IOS feature sets of Cisco 26/36/3700 series. For Cisco 2800 and 3800 series platforms, IP voice mirroring is required.
Q: What are the internal requirements of NM-HDA?
A: The following is a list of memory configurations recommended by Cisco:
For Cisco 2600 series: 64M DRAM and 16M flash memory.
For Cisco 2600XM series: 64-96M DRAM and 32M flash memory.
For Cisco 3640 and 3660 series: 96- 128M DRAM and 32M flash memory.
For 269 1, 3725 and 3745: 128M DRAM and 32M flash memory.
For Cisco 2800 and 3800 series: 256M DRAM and 64M flash memory.