Details
The Cisco® High-Density Analog and Digital Extension Module for Voice and Fax (EVM-HD) provides enterprises, managed service providers and service providers the ability to directly connect public-switched telephone networks (PSTNs) and existing telephony equipment to Cisco 2821, 2851, 2901, 2911, 2921, 2951, 3825, 3845, 3925, 3925E, 3945 and 3945E Integrated Services Routers. With support for up to 24 total voice and fax sessions, the Cisco High-Density Extension Module is ideal for networks with high analog (foreign exchange station [FXS], direct inward dialing [DID], and foreign exchange office [FXO]) and digital (Basic Rate Interface [BRI]) call-capacity requirements.
Product Overview
Figure 1. Cisco High-Density Analog and Digital Extension Module for Voice and Fax

• An 8-port extension module (part number EVM-HD-8FXS/DID)-Baseboard with 8 ports that can be configured individually for FXS or DID signaling
• Voice and fax expansion modules:
– A 4-port expansion module supporting BRI (NT and TE) (part number EM-4BRI-NT/TE)
– An 8-port expansion module supporting FXS and DID (part number EM3-HDA-8FXS/DID)
– A 6-port expansion module supporting FXO (part number EM-HDA-6FXO)
– A 7-port expansion module with 3 FXS and 4 FXO ports (part number EM-HDA-3FXS/4FXO)
Cisco 2821 and Cisco 2851 Extension Voice Module Slot
Cisco 3825 and Cisco 3845 Network Module Slot
Cisco 2900 and Cisco 3900 Service Module Slot
High-Density Extension Module Digital Signal Processor (DSP) Resources
Applications
Table 1. Cisco High-Density Extension Module Baseboard and Expansion Modules
Product Number |
Description |
EVM-HD-8FXS/DID |
The Cisco High-Density Extension Module for voice and fax has 8 FXS and DID ports. Individual ports on the baseboard module can be configured for FXS or DID signaling. Adjacent ports should share the same configuration to avoid impedance setting conflicts. A change to the impedance setting for one port, changes the setting on the adjacent port. Paired ports are: 0 and 1; 2 and 3; 4 and 5; 6 and 7. An on-premises FXS interface connects directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. Signaling support available in FXS mode includes loop-start and ground-start. DID trunks from the central office can be connected to the Cisco High-Density Extension Module baseboard for off-premises connections. Signaling support available in DID mode includes immediate, delay dial, and wink start. Users plug in up to two expansion modules in any combination to increase the voice and fax capacity of the Cisco High-Density Extension Module baseboard. |
EM-4BRI-NT/TE |
This 4-port BRI voice and fax expansion module has ports are that are configurable for NT or TE mode. This module allows connection to an ISDN S/T network by replicating either the network side or the terminal side. In NT mode the ports replicate the PSTN interface to a PBX that is compatible with European Telecommunications Standards Institute (ETSI) NET3 and QSIG switch types. In TE mode the ports support the same ISDN protocols as other Cisco Systems® products to allow connection to ISDN S/T networks, or through an external NT1 to ISDN U-interfaces. This module provides four on-premises S/T BRI trunk connections to the ISDN PBX. |
EM3-HDA-8FXS/DID |
This 8-port FXS/DID Voice and Fax Expansion Module provides on-premises FXS signaling to connect directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. Signaling support available in FXS mode includes loop-start and ground-start. This expansion module also works with the Cisco High-Density Analog Voice and Fax Network Module (part number NM-HDA-4FXS). DID trunks from the central office can be connected to the Cisco Voice and Fax Expansion Module for off-premises connections. Signaling support available in DID mode includes immediate, delay dial, and wink start. It supports up to eight ports in DID mode, both expansion slots combined (with eight DIDs on EVM baseboard, up to 16 DIDs maximum). Additionally, it supports robust front end protection. |
EM-HDA-6FXO |
This 6-port FXO voice and fax expansion module provides off-premises connection to the central office. This module supports FXO power failover. If power to the router fails, this feature helps enable a direct metallic path between an FXO port and a special "red". It also supports analog Centralized Automated Message Accounting (CAMA) on any port. telephone to provide a direct line to the PSTN. |
EM-HDA-3FXS/4FXO |
This 3-port FXS and 4-port FXO voice and fax expansion module provides on-premises FXS signaling to connect directly to a standard telephone, fax machine, or similar device and supplies ring, voltage, and dial tone. In addition, the FXO ports provide off-premises connection to the central office. FXS signaling support available includes loop-start and ground-start. There is no DID support. In addition, there is no FXO power failover support on the FXO ports. It also supports analog Centralized Automated Message Accounting (CAMA) on any port. |
SM-NM-ADPTR |
This is the adapter required to use the Network Modules and EVM Modules on the Cisco 2900 and 3900 Series Integrated Services Routers. |
Table 2. DSP Resources for the Cisco High-Density Extension Module
Module |
Description |
PVDM2-8 |
PVDM2 modules provide central Digital Signal Processor (DSP) resources for the Cisco High-Density Extension Module (EVM-HD) baseboard and its expansion modules. PVDM2 modules are purchased separately and installed in the DSP module slots located inside the Cisco 2821, Cisco 2851, Cisco 3825, and Cisco 3845 integrated services routers. Refer to PVDM2 datasheet at : |
PVDM2-16 |
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PVDM2-32 |
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PVDM2-48 |
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PVDM2-64 |
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PVDM3-16 |
PVDM3 modules provide central Digital Signal Processor (DSP) resources for the Cisco High-Density Extension Module (EVM-HD) baseboard and its expansion modules. PVDM3 modules are purchased separately and installed in the DSP module slots located inside the Cisco 2901, 2911, 2921, 2951, 3925, 3925E, 3945 and 3945E integrated services routers. Refer to PVDM3 datasheet at : http://www.cisco.com/en/US/prod/collateral/modules/ps3115/data_sheet_c78-553971.html
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PVDM3-32 |
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PVDM3-64 |
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PVDM3-128 |
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PVDM3-192 |
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PVDM3-256 |
Table 3. Call Complexity and Codecs Supported with PVDM2 DSP Modules
Call Complexity |
List of Standard Codecs Supported |
High Complexity |
G.711 a-law and mu-law; G.726 @ 32k, 24k, and 16k; G.729, A, B and AB; G.723.1 @ 5.3k and 6.3k; G.728, clear channel codec, and fax relay |
Medium Complexity |
G.711 a-law and mu-law; G.726 @ 32k, 24k, and 16k; G.729A and AB; clear channel codec, and fax relay |
Flexible or Low Complexity |
G.711 a-law and mu-law |
Primary Features and Benefits
Table 4. High-Density Extension Module Features and Benefits Summary
Feature |
Benefit |
Voice and Fax Over IP |
Voice and fax traffic is transport independent because IP traffic at Layer 3 can travel over any Layer 1 or Layer 2 media, including ISDN, leased lines, serial connections, Frame Relay, Ethernet, Token Ring, and ATM. |
Connection Trunk |
The connection trunk creates a tie-line replacement structure while only consuming bandwidth only during a call (digital-to-digital, digital-to-analog, or analog-to-analog capabilities). |
Local Voice Busy-Out (LVBO) |
Users can automatically busy-out any desired voice trunk line to a PBX or PSTN when a direct WAN or LAN connection to the router is down. This feature also allows busy-out of a far end trunk connection when configured for connection trunk. |
Caller-ID Support |
The module offers per-port configurable caller ID to phones connected to analog FXS voice ports using per call unblocking if desired. It interoperates with analog phones, the PSTN, PBXs, Cisco Unified Communications Manager, Cisco Unified Communications Manager Express (CME) and H.323 terminals such as Microsoft NetMeeting and IP phones. |
Call Admission Control Using Response Time Reporter (RTR) |
This product uses RTR to determine latency, delay and jitter and to provide real-time Impairment/Calculated Impairment Planning Factor (ICPIF) calculations before establishing a call across an IP infrastructure. RTR packets emulate voice packets receiving the same priority as voice throughout the network. This is a superior method to data and ping packets for determining congestion levels. |
Voice and Fax Over the Same Port |
Ports can be used for both voice and fax traffic; no dedicated ports are required. |
Works with Existing Phones, Faxes, PBXs, and Key Systems |
No user re-training is required. |
Call Control Signaling |
The product supports H.323 Versions 1, 2, 3, and 4; MGCP Version 0.1 and 1.0, and SIP call control protocols. The Cisco High-Density Extension module interoperates with any Cisco Unified Communications Manager release using the H.323 protocol. For MGCP, Cisco Unified Communications Manager Release 3.3(5), Release 4.0(2), and Release 4.1 add support for the Cisco High-Density Extension Module. Support is also available with Cisco Unified Communications Manager Express (CME) Release 3.1. Cisco voice and fax modules are interoperable with numerous emerging voice and videoconferencing applications. |
High-Performance DSP Architecture |
PVDM2 modules used in combination with the Cisco High-Density Extension Module baseboard and its expansion modules offer extremely low latency, which is essential for high-quality voice and fax services; the DSP architecture also helps enable all critical functions to be handled in software, allowing for simple code updates, scalability and new features. PVDM2s feature the latest DSP technology with support for conferencing and transcoding, higher call densities per DSP, and more flexibility in channel allocation per DSP. |
ITU Standard Codecs such as G.729, G.729A/B, and G.711 |
These standards-based compression technologies allow transmission of voice across IP. G.711 is standard 64-kbps PCM modulation using either mu-law or a-law. For a complete list of codecs supported, refer to Table 3. |
Silence Suppression and Voice Activity Detection |
Bandwidth is used only when someone is speaking. During silent periods of a phone call (approximately 50 percent of the time), bandwidth is available for other traffic. |
Comfort Noise Generation |
To better simulate phone calls over voice networks, this feature reassures the phone user that the connection is being maintained, even when no voice packets are being transmitted. |
Dial-Plan Mapping |
Automatic mapping of dialed VoIP phone numbers to IP addresses simplifies configuration and management. |
Dual Tone Multifrequency (DTMF) Tone Processing |
This feature helps enable access to voice mail and interactive-voice-response (IVR) systems. |
Fax and Modem Pass-Through |
This feature allows fax and modem traffic to pass through a voice port. |
Fax Relay |
Fax relay provides a more robust protocol for fax transmission over packet networks. It includes support for T.38 and T.37 fax protocols. |
Country-Specific Signaling |
This feature transparently delivers customary phone signals to users, facilitating acceptance of new technology. |
Autocalling and Private-Line Automatic Ring-Down (PLAR) |
With this feature, a destination phone can be configured to automatically ring when the caller lifts the handset. |
Hunt groups |
Calls can be forwarded automatically to the first available line. |
Battery Polarity Reversal Detection and Initiation |
Detection of disconnect supervision and far-end answer supervision through battery polarity reversal provides a robust method of providing supervisory disconnect, especially for loop-start signaling on FXS and FXO interfaces. |
Supervisory Disconnect |
Signaling protocols such as loop start do not provide means for quickly detecting when the call initiation is terminated prior to call connection. Supervisory disconnect quickly makes this determination and frees valuable resources for other calls. |
Product Specifications
Table 5. Specifications of 8-Port FXS and DID Voice and Fax Extension Module Baseboard
Product |
Specifications |
Part number EVM-HD-8FXS/DID |
|
Software Compatibility |
Cisco IOS Software Release 12.3(8)T4 or later |
Memory Requirements |
Refer to the Cisco IOS Software release notes to determine minimum Flash and system memory requirements. |
EMC Compliance |
FCC Class A device, CE Class A |
Safety Conformance |
UL 60950, EN 60950, AS/NZS60950, IEC 60950 |
Network Equipment Building System (NEBS) Compliance |
• Designed for NEBS Level 3: GR-63 and GR-1089, Type 1/3.
• Formal NEBS certification testing in progress; compliance results will be published upon completion
|
Physical Connector |
One RJ-21 connector |
RJ-21 Distribution Panel |
• MENTION OF NON-CISCO PRODUCTS OR SERVICES IS FOR INFORMATION PURPOSES ONLY AND CONSTITUTES NEITHER AN ENDORSEMENT NOR A RECOMMENDATION.
• Distribution panels are generally available from multiple cable and network adaptor vendors. Customers may, at their sole discretion, consider using a patch panel from Black Box Corporation. The Black Box patch panel accommodates RJ-11 and RJ-45 combinations and offers flexibility for expansion module upgrades (analog or digital). The Black Box patch panel is available direct from the manufacturer or from several national resellers and distributors.
• Black Box Corporation: http://blackbox.com/
• Technical support and ordering: 724 746-5500
• Black Box part number: JPM2194A
• Description: Distribution Panel for Cisco High Density Analog and Digital Extension Module for Voice and Fax (EVM-HD)
|
Spare |
The spare part number is EVM-HD-8FXS/DID=. |
Expansion Modules |
The Cisco High-Density Extension Module baseboard supports 0, 1 or 2 expansion modules in any combination |
DSP Resources |
PVDM2s provide central DSP resources for the Cisco High-Density Extension Module baseboard and its expansion modules. PVDM2s are purchased separately and installed in the DSP module slots located inside the Cisco 2821, Cisco 2851, Cisco 3825, and Cisco 3845 integrated services routers. |
DID Signaling Modes |
Immediate, delay-dial, and wink start |
DID Loop Resistance |
Up to 1800 ohms (including the terminal equipment) |
Disconnect Supervision |
Power denial (calling-party control, far-end disconnect) |
Caller ID |
On-hook transmission of frequency-shift-keying data |
FXS Loop Resistance |
Up to 600 ohms (including the phone or terminal equipment) |
On-Hook Voltage |
-44V |
Ringing Tone |
The ringing tone is configurable for different country requirements |
Ringing Voltage |
40 Vrms at 5 REN at 25 Hz (configurable frequency) |
Ringing Frequencies |
25Hz and 50Hz |
Address Signaling Formats |
In-band DTMF Out-of-band pulse (10 pps) |
FXS Signaling Formats |
Loop-start and ground-start |
Table 6. Table 6. Cisco 8-Port FXS Voice and Fax Expansion Module Specifications
Product |
Specifications |
Part number EM3-HDA-8FXS/DID |
|
Software Compatibility |
Cisco IOS Software Release 12.4(20)T or later when used with the Cisco High-Density Extension Module baseboard |
Memory Requirements |
Minimum Flash and system memory requirements available in the Cisco IOS Software release notes. |
Interface Type |
FXS and DID |
EMC Compliance |
FCC Class A device, CE Class A |
Safety Conformance |
UL60950, EN60950, AS/NZS60950, IEC 60950 |
NEBS Compliance |
NEBS Level 3: GR-63 and GR-1089, Type 2/4 |
Spare |
EM3-HDA-8FXS= |
FXS Loop Resistance |
Up to 600 Ohms (including the phone or terminal equipment) |
On-Hook Voltage |
-44Vdc |
Ringing Tone |
The ringing tone is configurable for different country requirements |
Ringing Voltage |
40 Vrms at 5 REN at 25 Hz (configurable frequency) |
Ringing Frequencies |
25 Hz, 50 Hz |
Address Signaling Formats |
• In-band DTMF
• Out-of-band pulse (10 pps)
|
Signaling Formats |
Loop-start and ground-start |
Physical Connector |
None; ports are accessed through the RJ-21 connector on the Cisco High-Density Extension Module baseboard. |
Table 7. Cisco 4-Port BRI Voice and Fax Expansion Module Specifications
Product |
Specifications |
Part number EM-4BRI-NT/TE |
|
Software Compatibility |
Cisco IOS Software Release 12.3(8)T4 or later |
Memory Requirements |
Minimum Flash and system memory requirements available in Cisco IOS Software release notes |
Interface Type |
S/T BRI |
EMC Compliance |
FCC Class A device, CE Class A |
Safety Conformance |
UL 60950, EN 60950, AS/NZS60950, IEC 60950 |
NEBS Compliance |
• NEBS Level 3: GR-63 and GR-1089, Type 2/4
• Formal NEBS certification testing in progress; compliance results will be published upon completion
|
Spare |
EM-4BRI-NT/TE= |
Address Signaling Formats |
ISDN or in-band DTMF |
ITU Compliance |
ITU-T I.430, Q.920, Q.921, Q.930, and Q.931 |
Interface |
Four-wire user side S/T or four-wire network side S/T. NT selection optionally provides up to 25mA @ -40V loop power |
ISDN Digital Access |
S/T BRI 2B+D |
Physical Connector |
None; ports are accessed through the RJ-21 connector on the Cisco High-Density Extension Module baseboard. |
Table 8. Cisco 6-Port FXO Voice and Fax Expansion Module Specifications
Product |
Specifications |
Part number EM-HDA-6FXO |
|
Software Compatibility |
Cisco IOS Software Release 12.3(11)T or later |
Memory Requirements |
Minimum Flash and system memory requirements available in Cisco IOS Software release notes |
Interface Type |
FXO |
EMC Compliance |
FCC Class A device, CE Class A |
Safety Conformance |
UL 60950, EN 60950, AS/NZS60950, IEC 60950 |
NEBS Compliance |
• NEBS Level 3: GR-63 and GR-1089, Type 2/4
• Formal NEBS certification testing in progress; compliance results will be published upon completion
|
Spare |
EM-HDA-6FXO= |
Address Signaling Formats |
• In-band DTMF
• Out-of-band Pulse (10 pps)
|
Signaling Formats |
Loop start and ground start |
Tone Disconnect Supervision |
Call disconnect on progress tone of less than 600 Hz |
Battery Polarity Reversal Detection |
Detection of disconnect supervision and far-end answer supervision via battery polarity reversal |
Power Interrupt Disconnect |
Call disconnect on power interrupt of >600 ms |
Physical Connector |
None; ports are accessed through the RJ-21 connector on the Cisco High-Density Extension Module baseboard |
Table 9. Cisco 3-Port FXS and 4-Port FXO Voice and Fax Expansion Module Specifications
Product |
Specifications |
Part number EM-HDA-3FXS/4FXO |
|
Software Compatibility |
Cisco IOS Software Release 12.3(11)T or later |
Memory Requirements |
Minimum Flash and system memory requirements are available in Cisco IOS Software release notes |
Interface Type |
FXS and FXO |
EMC Compliance |
FCC Class A device, CE Class A |
Safety Conformance |
UL 60950, EN 60950, AS/NZS60950, IEC 60950 |
NEBS Compliance |
• NEBS Level 3: GR-63 and GR-1089, Type 2/4
• Formal NEBS certification testing in progress; compliance results will be published upon completion
|
Spare |
EM-HDA-3FXS/4FXO= |
Address Signaling Formats |
• In-band DTMF
• Out-of-band Pulse (10 pps)
|
Signaling Formats |
Loop start and ground start |
FXS Loop Resistance |
Up to 600 Ohms (including the phone or terminal equipment) |
FXS On-Hook Voltage |
-44V |
FXS Ringing Tone |
The ringing tone is configurable for different country requirements |
FXS Ringing Voltage |
40 Vrms at 5 REN at 25 Hz (configurable frequency) |
FXS Ringing Frequencies |
25 Hz, 50 Hz |
Tone Disconnect Supervision |
Call disconnect on progress tone of less than 600 Hz |
Battery Polarity Reversal Detection |
Detection of disconnect supervision and far-end answer supervision via battery polarity reversal |
Power Interrupt Disconnect |
Call disconnect on power interrupt of >600 ms |
Homologation
Table 10. Telecom Approvals-(approvals in progress for other countries)
EVM-HD-8FXS/DID |
EM3-HDA-8FXS/DID |
EM-4BRI-NT/TE |
EM-HDA-6FXO |
EM-HDA-3FXS/4FXO |
United States |
United States |
United States |
United States |
United States |
Canada |
Canada |
Canada |
Canada |
Canada |
CE countries |
CE countries |
CE countries |
CE countries |
CE countries1 |
Australia |
Australia |
Australia |
Australia |
Australia |
Japan |
Japan |
Japan |
Japan |
Japan |
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New Zealand |
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Singapore |
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Bulgaria |
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Israel |
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South Korea |
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China |
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1The CE mark is recognized in the following countries: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxemburg, Malta, Monaco, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, and United Kingdom.
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Additional Information
SKU | EM-HDA-6FXO-RF |
---|---|
Weight (Kg) | 1 |
Datasheet URL | http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/voice-modules-interface-cards/product_data_sheet0900aecd8016c1c6.html |
Condition | Refresh |
Module Type | Extension Module |