Cisco Systems 3522 BRI, 3527 PRI manual About PRI Gateway Call Handling Capacity

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Chapter 1 Functionality

About Cisco Unified Videoconferencing 3500 Gateway Functionality

About PRI Gateway Call Handling Capacity

Table 1-3lists the maximum call handling capacity of the PRI gateway for different types of calls.

Table 1-3

PRI Gateway Call Handling Capacity

 

 

 

 

Call Type

 

Maximum Number of

Maximum Number of

 

 

Calls Using 1 x E1 PRI

Calls Using 1 X T1 PRI

 

 

Line

Line

 

 

 

voice (64 Kbps)

30

23

 

 

 

2B video (128 Kbps)

15

11

 

 

 

6B video (384 Kbps)

5

3

 

 

 

12B video (768 Kbps)

2

1

 

 

 

 

Note Enabling ISDN-to-IP DTMF detection in the PRI gateway for video calls reduces the number of supported calls by half.

About BRI Gateway Call handling Capacity

Table 1-4lists the maximum call handling capacity of the BRI gateway for four BRI lines, eight voice-only calls, or eight video calls, or any combination of the two.

Table 1-4

BRI Gateway Call Handling Capacity

 

 

 

Number of Calls

 

Capacity

 

 

 

 

1

 

384

Kbps+ or 412 Kbps

 

 

 

 

2

 

256

Kbps

 

 

 

 

4

 

128

Kbps

 

 

 

8

 

64 Kbps

 

 

 

 

About Gateway Call Bandwidth Overhead

According to the H.320 standard, the available bandwidth allocated to a call at any given bit rate will always be slightly less than the stated maximum for the following reasons:

All stated maximum call bandwidths include provision for control, audio, video, and data traffic.

Video traffic on the ISDN side contains additional bits for error correction purposes which also consume bandwidth. Video traffic on the IP side does not include this additional load.

Opening an audio channel further reduces the bandwidth available to the video traffic.

For example, a call at 384 Kbps actually has only 363 Kbps available to it. Control and error correction account for the remaining 21 Kbps.

 

 

Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5

 

 

 

 

 

 

OL-14910-01

 

 

1-11

 

 

 

 

 

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Contents Customer Order Number Text Part Number OL-14910-01 Americas HeadquartersPage N T E N T S Safety EMC OL-14910-01 About the Cisco Unified Videoconferencing 3522 BRI Gateway FunctionalityAbout the Cisco Unified Videoconferencing 3527 PRI Gateway TCS4 About Gateway FeaturesFeature Description Functionality VGA, XGA, SVGA, SIF, 4SIF, CIF, QCIF, 4CIF, 16CIF Feature Cisco UnifiedFeature Cisco Unified About Multimedia Conferencing Multimedia Conferencing through the Gateway About Point-to-Point ConferencingAbout Gateway Isdn Network Connections About Multipoint ConferencingAbout Gateway IP Network Connections PRI Gateways BRI Gateways About BRI Gateway Call handling Capacity About PRI Gateway Call Handling CapacityAbout Gateway Call Bandwidth Overhead CapacityAbout Peer-to-Peer Connectivity Resource Allocation across E1/T1 LinesFront Panel Physical DescriptionCisco Unified Videoconferencing 3527 PRI Gateway Rear Panel Alarm LEDComponent Description CD LEDCisco Unified Videoconferencing 3522 BRI Gateway RTM Alarm LEDCall Appearances EktsVerifying the Package Contents Fitting a Bracket for Rack Mounting Setting the IP Address Connecting to a PCBefore You Begin RequirementsTo change the configuration software password Changing the Configuration Tool Login Password Local Port Monitoring Connections Snmp ManagementSvga Port Performing Software UpgradesNetscape Navigator Users Registering the Online HelpIntroduction Using the Cisco Software Upgrade UtilityLaunching the Cisco Software Upgrade Utility Upgrading Software Click Customize Snmp SettingsPin Function Cable Connections and Pin-outsUnit RS-232 9-Pin Serial Port Isdn Port RJ-45 8-Pin IP Network PortTechnical Specifications Table Technical SpecificationsLED Indicators Push ButtonsChipset Power SupplyOperating System MemoryPage OL-14910-01 Grounding SafetyElectrical Safety High Voltage ESD ProceduresElektrische Sicherheit SicherheitESD-Verfahren WarnhinweiseSeguridad Electrica SeguridadPuesta a Tierra Alta TensiónProcedimientos ESD Mise a la Terre SecuriteSecurite Electrique Haute Tension Prevention des Decharges ElectrostatiquesChapter Compliance and Certifications Safety ComplianceFCC Part 15 Notice TelecomCISPR24 CE CTR3, CE CTR4Industry Canada Acta Part 68 NoticeEnvironmental Compliance EMC BRIIsdn EMCSnmp SvgaPRI IN-4
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3527 PRI, 3522 BRI specifications

Cisco Systems has long been a leader in networking and telecommunications equipment, and its BRI (Basic Rate Interface) and PRI (Primary Rate Interface) products are essential components in enabling businesses to manage voice and data communications efficiently. Notable models such as the Cisco 3522 BRI and 3527 PRI have earned recognition for their robust performance and versatile features.

The Cisco 3522 BRI is designed to deliver high-quality voice and data services over ISDN (Integrated Services Digital Network) connections. With two B channels for voice or data transmission, each supporting up to 64 Kbps, this device is ideal for small to medium-sized businesses that require reliable communication solutions while maintaining cost-effectiveness. The Cisco 3522 BRI supports multiple protocols, making it a flexible choice to adapt to various network environments.

On the other hand, the Cisco 3527 PRI supports up to 30 B channels, thereby significantly increasing the capacity for voice calls and data transfer. This scalability makes the 3527 PRI suitable for larger organizations that demand higher throughput and call handling capability. It operates over T1 and E1 lines, allowing businesses to leverage existing infrastructure while improving operational efficiencies. Additionally, the 3527's advanced features, such as call processing and load balancing, contribute to a seamless communication experience.

Both devices support a range of technologies that enhance functionality and performance. They are equipped with Call Admission Control (CAC) to optimize bandwidth use and reduce congestion during peak traffic. Cisco's VoIP technology, including features such as voice provisioning, fax over IP, and QoS (Quality of Service) mechanisms, ensures voice clarity and reliability.

Security is paramount, and both the 3522 and 3527 incorporate various protocols such as SRTP (Secure Real-Time Transport Protocol) to protect voice communications against unauthorized access. Furthermore, integration with Cisco's unified communications offerings allows for a more cohesive communication strategy, ensuring that users can take advantage of collaboration tools and data services.

In conclusion, the Cisco 3522 BRI and 3527 PRI models stand out with their impressive feature sets and technologies, making them an excellent investment for businesses needing reliable, scalable, and secure voice and data communication solutions. Choosing Cisco means embracing a future-proof solution that can grow with your organization's communication needs.