Cisco Systems 3527 PRI, 3522 BRI User Manual
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5
January 2008
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Text Part Number: OL-14910-01
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Installation and Upgrade Guide for Cisc o Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Rel ease 5.5
© 2008 Cisco Systems, Inc. All rights res erved.
CONTENTS
CHAPTER
1 Functionality 1-1
About Cisco Unified Videoconferencing 3500 Gateway Products 1-1
About the Cisco Unified Videoconferencing 3527 PRI Gateway 1-1
About the Cisco Unified Videoconferencing 3522 BRI Gateway 1-1
About Gateway Features 1-2
About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies 1-6
About Multimedia Conferencing 1-6
About Point-to-Point Conferencing 1-7
About Multipoint Conferencing 1-8
About Gateway IP Network Connections 1-8
About Gateway ISDN Network Connections 1-8
About Cisco Unified Videoconferencing 3500 Gateway Functionality 1-10
About PRI Gateway Call Handling Capacity 1-11
About BRI Gateway Call handling Capacity 1-11
About Gateway Call Bandwidth Overhead 1-11
Resource Allocation across E1/T1 Lines 1-12
About Peer-to-Peer Connectivity 1-12
CHAPTER
OL-14910-01
2 Setting Up Your Cisco Unified Videoconferencing 3500 Gateway 2-1
Physical Description 2-1
Front Panel 2-1
Cisco Unified Videoconferencing 3527 PRI Gateway Rear Panel 2-2
Cisco Unified Videoconferencing 3522 BRI Gateway RTM 2-3
Preparing for Installation of the Cisco Cisco Unified Videoconferencing 3527 PRI Gateway 2-3
Preparing for Installation of the Cisco Unified Videoconferencing 3522 BRI Gateway 2-4
Verifying the Package Contents 2-5
Mounting the Cisco Unified Videoconferencing 3500 Gateway Unit in a 19-inch Rack 2-5
Cisco Unified Videoconferencing 3500 Gateway Unit Initial Configuration 2-6
Connecting to a PC 2-7
Setting the IP Address 2-7
Changing the Configuration Tool Login Password 2-9
Connecting the Cisco Unified Videoconferencing 3500 Gateway Unit to the LAN 2-10
Managing and Monitoring the Cisco Unified Videoconferencing 3500 Gateway Unit 2-10
Installation and Upgrade Guide for Cisco UnifiedVideoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release5.5
iii
Contents
SNMP Management 2-10
Local Port Monitoring Connections 2-10
Performing Software Upgrades 2-11
Accessing the Cisco Unified Videoconferencing 3500 Gateway Administrator Interface 2-11
Registering the Online Help 2-12
Netscape Navigator Users 2-12
CHAPTER
CHAPTER
CHAPTER
CHAPTER
3 Using the Cisco Software Upgrade Utility 3-1
Introduction 3-1
Launching the Cisco Software Upgrade Utility 3-1
Upgrading Software 3-2
4 Cable Connections and Pin-outs 4-1
Unit RS-232 9-Pin Serial Port 4-1
RJ-45 8-Pin IP Network Port 4-2
ISDN Port 4-2
5 Technical Specifications 5-1
Technical Specifications Table 5-1
6 Safety 6-1
Electrical Safety 6-1
Grounding 6-1
High Voltage 6-2
iv
ESD Procedures 6-2
Sicherheit 6-3
Elektrische Sicherheit 6-3
Hochspannung 6-3
ESD-Verfahren 6-3
Warnhinweise 6-3
Seguridad 6-4
Seguridad Electrica 6-4
Puesta a Tierra 6-4
Alta Tensión 6-4
Fuente de Alimentación 6-4
Procedimientos ESD 6-5
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OL-14910-01
Securite 6-6
Securite Electrique 6-6
Mise a la Terre 6-6
Haute Tension 6-7
Prevention des Decharges Electrostatiques 6-7
Contents
CHAPTER
I
NDEX
7 Compliance and Certifications 7-1
Safety Compliance 7-1
EMC 7-2
FCC Part 15 Notice 7-2
Telecom 7-2
ACTA Part 68 Notice 7-3
Industry Canada 7-3
Environmental Compliance 7-4
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Contents
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CHA PTER
1
Functionality
This section describes the following topics:
• About Cisco Unified Videoconferencing 3500 Gateway Products, p ag e 1-1
• About Gateway Features, page 1- 2
• About Cisco Unified Videoconferencin g 3 500 Gateway Applications an d Topologies, page 1-6
• About Cisco Unified Videoconferencing 3500 Gateway Functionalit y, page 1-10
About Cisco Unified Videoconferencing3500 Gateway Products
The Cisco Unified Videoconferenc ing 3500 Gateway series consi sts of t he foll owing pr oduct s:
• Cisco Unified Videoconferencing 3527 PRI Gateway (see the “About the Cisco Unified
Videoconferencing 3527 PRI Gateway”)
• Cisco Unified Videoconferencing 3522 BRI Gateway (see the “About the Cisco Uni fied
Videoconferencing 3522 BRI Gateway” section on page 1-1)
About the Cisco Unified Videoconferencing 3527 PRI Gateway
The Cisco Unified Videoconferencing 3527 PRI Gateway enables audio, video, and data communication
between H.320 endp oi nts that co nne ct thro ugh I SDN, and H .323 en dpoin ts tha t c onnec t t hr ough a
packet-based network. For voice-over-IP, the gateway enables PSTN voice callers to connect from the
ISDN network to I P voice cal ler s. The Cisco Unified Videoconferencing 3527 PRI Gateway suppo rts
one PRI ISDN port.
About the Cisco Unified Videoconferencing 3522 BRI Gateway
The Cisco Unified Videoconferencing 3522 BRI Gateway enables audio, video and data communication
between H.320 endpoints that connect through Integrated Services Digita l Network (ISDN), and H.323
endpoints that connect through a packet-based network. For voice-over-IP, the gateway enables Public
Switched Telephone Network (PSTN) voice callers to connect with IP voice callers. The Cisco Unified
Videoconferencing 3522 BRI Gateway supports up to four BRI ISDN ports.
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1-1
About Gateway F eatures
About Gateway Features
Table 1-1 lists the major feat ur es of t he Ci sco Unified Videoconferencing 3500 Gateway.
Table 1-1 Gateway Feature Summary
Feature Description
Interoperability The gateway provides a high degree of interoperability with other H.323
Web-based
management
SNMP management The gateway features Simple Network Manageme nt Protocol (SN MP)
Diagnostics The gateway features front and rear pan el LED indic ators that display
Network load
balancing
T.120 data
collaboration
Quality of service
(QoS)
Dial plan The gateway supports a simplified dial plan for out bound dia ling using a
Direct dialing and call
routing
Chapter1 Functionality
compliant gateways, gatekeepe rs, t erm in als, prox y, and Multipoint
Control Unit (M CU) p rod uct s by bei ng base d on t h e H .32 0 stand ar d and
H.323 protocol stac k.
The gateway features the gateway interface. This is a web interface used
to configure and monitor the gateway. You can view and modify all
aspects of th e gat eway configurati on f rom a r emot e l oca tio n u sing a
Java-enabled web browser.
management that su ppo rts a ll a spe cts of m onit oring, di agno stics,
configuration, and t rappi ng.
status for the unit. You can also access remote diagno stics of the unit
through the ga teway interfa ce, Telnet, SNMP, or a serial port.
The gateway supports load balancing on the networ k by communicati ng
with a gatekeeper throu gh H.32 3 RAI (Res ource Available
Indication)/RAC (Resource Available Confirmation) messages.
The gateway supports data transfers in calls between ISDN and IP by
using high speed T.120 in HMLP and VarMLP formats.
The gateway features c on figurabl e c oding o f m e dia packe ts t o achi eve
QoS routing priority on th e Intern et Protoco l (IP) netwo rk. The Type of
Service (ToS) bits of the IP datagr am head er can be conf igured f or pri ority
level.
single universal prefix. Using the dial plan, the gateway automatically
detects the capabilities recei ved in the Setup m essage from the IP endpoint
and sets the same bit ra te for th e ISDN (or seri al inte rf ace) side of the call .
The gateway dial plan supports the fo llowing direct dial ing and ca ll
routing facilities:
1-2
• Direct Inward Dialing (DID)
• Multiple Subscriber Network (MSN)
• Q.931 Sub-addressing Inf orm ation E lem en t
Internal and External Interactive Voice Response (IVR)
• TCS4
• Default extension
Access control The gateway features password-controlled access to the gateway interface.
Up to ten different administrator access profiles can be defined for the
gateway.
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Chapter 1 Functionality
About Gateway Features
Table 1-1 Gateway Feature Summary (continued)
Feature Description
DTMF translation The gateway supports translation between in-band Dual Tone
Multi-Frequency (DTM F) sig nal s (on th e ISD N si de) and out- of- band
H.245 messages (on the IP side). DTMF translation occurs for voice and
video calls.
Dual video The gateway sup ports H.239 standards-based d ual video and TANDBERG
DuoVideo technology. Dual video streams enable a screen to carry video
images from one sourc e while simul taneousl y displayi ng images fro m a
second source.
Conceal caller ID The gateway supports a conceal caller ID feature that instructs the
gatekeeper to conc eal the id entity of the call ing endp oint on th e IP or
ISDN network, whether the presentation restricted feature is enabled or
not.
H.323 fast start The gateway H.323 fast start feature enab les endpo ints to jo in a voice
conference in the gateway more quickly.
ISDN rollover
(available in
Cisco Unified
Videoconferencing 35
The gateway features ISDN rollover. In this feature, the gateway sends a
“busy out” channel request to the PSTN switch when th e curren t PRI
connection is left with less than a predefined number of available B
channels. The PSTN switch “rolls over” to the next available gateway.
27 PRI Gateway only)
Network Specific
Facility (available in
Cisco Unified
Videoconferencing 35
The gateway provides support for Network Specific Facility Information
Elements (NSF IEs) which enable system administrators to specify to
service providers the eq uipment, service, or ne twork throug h which they
want a call routed.
27 PRI Gateway only)
ISDN connectio n
failure
The gateway responds to ISDN connection failure events, by unregistering
from its gatekeeper. The gatekeeper is forced to send new IP-to-ISDN
calls through a different gateway, thus ensuring high call completion rates.
The gateway re-registers to the gatekeeper when the ISDN connection is
restored.
Downspeeding The gateway features downspeeding functionality. In the downspeeding
feature, the gateway attempts to reconnect a disconnected video call either
at a lower bandwidth or as a voice c a ll. D ownspeedi ng c ontr ibutes to a
higher percen tag e of c all c om pleti on o n the network. T he ga teway
supports downspeeding at call set up and in mid- call.
Multiple trap server
The gateway supports up to three SNMP trap servers.
support
H.239 support The gateway supports the H.239 protocol in ISDN-to-IP ca lls and in
IP-to-ISDN ca lls.
Encryption support The gateway supports H.235-compliant AES 128 encryption for calls over
IP networks, and H.233 and H.234 -comp liant AES 128 enc ryptio n for
calls over ISDN networks.
H.243 Conference
Control support
The gateway supports the H.243 protocol in ISDN-to- IP calls and in
IP-to-ISDN calls . T he ga teway iden tifies t he p roto col version t hat an I P
endpoint uses and sends H.239 capabilities only to those endpoints
working with protocol version 4.0 or later.
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1-3
About Gateway F eatures
Table 1-1 Gateway Feature Summary (continued)
Feature Description
Peer-to-peer
connectivity
The gateway supports connectivity to the IP network through a gatekeeper,
or directly to a peer device such as Cisco Unified Communications
Manager.
IP network
connections
The gateway has one 10/ 100B ase-T Ethern et IP port (on t he f ro nt p an el)
and connects to an IP segment through a direct connection to a network
switch.
Table 1-2 lists features for specific Cisco gateways.
Table 1-2 Cisco Gateway Feature Specifics
Chapter1 Functionality
Feature Cisco Unified
Videoconferencing 3527 PRI Gateway
Cisco Un ified
Videoconferencing 3522 BRI Gateway
Supported ports 1 PRI ISDN port 4 BRI ISDN ports
Supported video
H.320, H.323 (using Cisco Stack v4. 0)
conferencing pr otocols
Supported audio
codecs
The term audio transcoded video calls refers to the proc ess wh ereb y an audio
stream in a multimedia call can be transcoded from one codec type to another.
Basic and advanced a udio cod in g s uppo rte d cod ecs : G .711 , G.72 2, G.72 2. 1,
G.723.1, G.728
Audio Transcoding G.711 (ISDN) < > G.723.1 (IP) for up
to 30 voice ch an ne ls .
G.711 (IP) < > G.728 (ISDN) for up to
20 audio tran sco de d v ide o c hann el s.
G.711 (ISDN) < > G.723.1 (IP) for up
to 8 voice channels.
G.711 (IP) < > G.728 (ISDN) for up to
8 audio transcoded video ch annels .
The gateway automatically performs
A-Law G.711-to-µ-Law G.711
translation be twee n the IP and ISD N
sides if needed.
Note When your Cisco unit
includes both a gateway and a
MCU, G.728 transcodi n g is
supported on the MCU only.
Supported video
H.261, H.263, H.26 3+ (Annexes F, J and N), H.263++ (Annex W), H.264
protocols
Supported video
VGA, XGA, SVGA, SIF, 4SIF, CIF, QCIF, 4CIF, 16CIF
resolutions
Supported bandwidths
(Kbps)
56, 64, 112, 128 , 168, 1 92, 2 24, 2 56,
280, 320, 336, 384, 44 8, 51 2, 67 2,
56, 64, 112, 1 28, 2 24, 25 6, 33 6, 38 4
and 512
768, 1288, 1472, 1680 an d 1920
Note Bandwidth rates of 256 Kbp s a nd up suppor t t he G .722 a udio code c .
1-4
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Chapter 1 Functionality
About Gateway Features
Table 1-2 Cisco Gateway Feature Specifics (continued)
Feature Cisco Unified
Videoconferencing 3527 PRI Gateway
Call handling
capabilities
For 1 x PRI T1 line:
23 ports (voice)
23 ports 1B (v ide o a nd dat a)
11 ports 2B (v ide o a nd dat a)
3 ports 6B (video and data)
For 1 x PRI E1 line:
30 ports (voice)
30 ports 1B (v ide o a nd dat a)
Cisco Un ified
Videoconferencing3522 BRI Gateway
For 4 x BRI lines:
8 voice-only calls or 8 video calls or
any combination of the two:
1 call x 512 Kbps
1 call x 384 Kbps +
2 calls x 256 Kbps
4 calls x 128 Kbps
8 calls x 64 Kbps
15 ports 2B (v ide o a nd dat a)
5 ports 6B (video and data)
Line quality Supports line echo cancellation, H.323 Fast Start and DTMF detection for
voice and video calls.
IP network conne ction I10/100Base-T Ethernet I P U TP c onn ect ion (on the fro nt pane l).
Serial control port
(DB-9) connection
Supported signaling
protocols
RS-232 DTE 9-pin D-t ype conne ction on fron t panel for co nnection to a PC
terminal or an external modem.
5ESS and 4ESS, DMS100, National
ISDN, Euro-ISDN, VN6 Dialing
(France), NTT (Japan), Hong Kong
Dialing (Hong Kong), Su ppo rt f or
Taiwan PRI system.
DMS100, National IS DN, 5 ESS
Custom/Multipoint (US, Taiwan)
5ESS PTP (US, Taiwan)
ETSI (France, E urope, Taiwan, Hong
Kong)
PRI interface Configurable E1/T1 PRI network
interface.
Support for frac ti onal E1/ T1 c han nel
selection.
Configurable as te rmin al sid e (T E) or
network side (NT) device.
Configurable Long Haul PRI module
(supported in Japan only ).
Switch information Numbering Plan Identifier (NPI),
Type of Number (TON) and Network
Specific Facility (NSF) information
elements are configurable per PRI
port.
ETSI PTP (France, Europe, Taiwan)
VN6 Dialing (Franc e)
Austel 1 Dialing (Austr alia)
KDD, NTT (Japan)
Hong Kong Dialing (Hong Kong).
N/A
N/A
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About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
Table 1-2 Cisco Gateway Feature Specifics (continued)
Chapter1 Functionality
Feature Cisco Unified
Videoconferencing 3527 PRI Gateway
Bonding calls Internal Imux p rovidin g ca lls at 12 8
Kbps (2B) up t o ful l P RI of
1472 Kbps (23B ) for T 1 and up to fu ll
PRI of 1920 Kbps (30B) for E1 using
bonding mode 1.
Parallel dialing for bonded calls. Parallel dialing for bonded calls.
Internal IVR capacity 30 simultaneous calls 8 simultaneous calls
Cisco Un ified
Videoconferencing 3522 BRI Gateway
Internal Imux providing calls at 128
Kbps (2B) up to 512 Kbps (8B) using
bonding mode 1.
About Cisco Unified Videoconferencing3500Gateway
Applications and Topologies
The Cisco Unified Videoconferencing 3500 Gateway supports multimedia conferencing by translating
between H.323 and H .320 pro toco ls. Exa m ples of networ k ap plic atio ns t hat use t he ga teway inclu de :
• Multimedia conferencing (see the “About Multimedia Conferencing” section on page 1-6)
• Point-to-Point conferencing (see the “Ab out Poi nt-t o- Point C onfer en ci ng” se cti on on page 1-7)
• Multipoint conferencing (see the “About Multipoint Conferencing” section on page 1-8)
• IP networking (see the “About Gateway IP Network Connections” section on pa ge 1 -8)
• ISDN networking (see the “About Gateway ISDN Network Co nnecti on s” sect ion on page 1-8)
About Multimedia Conferencing
The Cisco PRI gat eway and BRI gat eway enabl e H .3 23 en dpo int s o n the IP n etwork t o com mu nica te
with an H.320 terminal, an ISDN phone, or a regular phone on a circuit-switched public network without
having to connect directly to these networks. The gateway allows all IP network terminals to support
video conference s w ithou t c onne ct ing every desktop c om pute r to an ISD N li ne ( see Figure 1-1).
1-6
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Chapter 1 Functionality
H.323
e
ar
e
157175
t
e
About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
Figure 1-1 Multimedia Conferencing through th e Gateway
ndpoint
PSDN
ISDN
H.323
terminal
H.323
ndpoint
IP network
Cisco
chassis/unit
with serial
gateway
Typical multimedia conferencing applications include:
• Business video conferencing
• Distance learning
• Telemedicine
• Video-enabled call centers
• Telecommuting
Regul
phone
ISDN
phone
157174
About Point-to-Point Conferencing
The Cisco BRI gateway enables direct video, voice, and data communication between an H.320 (ISDN)
terminal and H.323 (IP) terminals at bandwidths of up to 512 Kbps (4 BRI lines) using bonding mode 1
(see Figure 1-2).
The Cisco PRI gateway enables direct video, voice, and data communication between an H.320 (ISDN)
terminal and H.323 (IP) term inals at ba ndwidths of up to 1472 Kbps (23 B bond ing for T1) and up t o
1920 Kbps (30B b ondin g f or E1).
Figure 1-2 Point-to -Point Confe rencing through the Gat eway
H.323
erminal
IP network
H.323
ndpoint
Cisco
chassis/unit
with serial
gateway
ISDN
H.323
terminal
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About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
T
92871
T
T
T
T
IP
About Multipoint Conferencing
Together with the Cisco MCU, the Cisco PRI gateway and BRI gateway enable H.320 ISDN terminals
to participate in a mixed ISDN-IP mul tipoin t multim edia con ference w ith IP network end points (se e
Figure 1-3).
For example, when an H.320 ISDN terminal wants to participate in a multipoint conference with H.323
IP endpoints, the H.320 ISDN terminal can either join the multipoint conference by dialing to the
gateway, or be invited into the con fe renc e by one of th e pa rti ci pati ng IP endp oi nts. In ei ther c as e, t he
gateway connects the ISDN terminal to the Cisco MCU, enabling it to participate in the multipoint
conference.
Figure 1-3 Mixed ISDN-IP Multipoint Multimedia Conference
network
Chapter1 Functionality
H.323
erminal
H.323
erminal
H.323
erminal
Cisco IPVC MCU
H.323
erminal
H.323
erminal
IP
IP phone
Cisco IPVC
chassis/unit
Cisco IPVC
Gateway
IP
IP phone
H.320
Terminal
ISDN
H.320
Terminal
H.320
Terminal
About Gateway IP Network Connections
The Cisco PRI gateway and BRI gateway feature one 10/100Base-T Ethernet IP port (on the front panel)
and connect to an IP segment throug h a direct co nnec tion to a networ k switch.
About Gateway ISDN Network Connections
The Cisco BRI gateway feat ures four B RI ISD N c onn ect ions. Ea ch BRI l ine p rovides two B c hanne ls
and one D signalling channel.
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Chapter 1 Functionality
e
157167
H
e
PRI Gateways
About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
The Cisco PRI gateway features configurable E1/T1 PRI ISDN connections. When configured as an E1
connection, each port provides 30 B channels and one D signaling channel. When configured as a T1
connection, each port provides 23 B channels and one D signaling channel. The type of line available
depends on your loc al ISDN provide r. You configure the gateway PRI po rt t o an E1 or T1 i n terface
accordingly. In addition, you can choose to activate only specific channels by using fracti onal channe l
selection.
You can connect the PRI gateway directly to a PRI line pro vid ed b y your l ocal ISDN pro vider (as sho wn
in Figure 1-4), or to a local private branch excha nge (PBX) that provides th e PRI connection (as shown
in Figure 1-5).
Figure 1-4 Connecting the PRI Gateway Directly to a Central Office Switch
Private
IP
network
H.323
Terminal
IP
IP phone
Figure 1-5 Connecting the PRI Gateway to a PBX that Provides a PRI Line
.323 terminal
IP network
Cisco IPVC
chassis/unit
Cisco IPVC
Gateway
Cisco chassis/unit
PRI T1/E1
Public
PRI T1/E1
Central offic
switch
PublicPrivate
92873
Central Offic
switch
IP phone
Cisco Gateway
IP
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PBX
1-9
About Cisco Unified Video conferencing 3500 Ga te way Functionality
H
e
PublicPrivate
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H
PublicPrivate
e
BRI Gateways
You can connect the BRI gateway to a local private branch exchange (PBX) that provides the BRI
connection (as shown i n Figure 1-6), or to a pu bli c ph one n etwor k using an NT 1 d evice (as shown i n
Figure 1-7).
Figure 1-6 Connecting the BRI Gateway Directly to a PBX that Provides a BRI Line
.323 terminal
IP network
Cisco chassis/unit
Chapter1 Functionality
Central Offic
switch
BRI
IP phone
Cisco Gateway
IP
Figure 1-7 Connecting the BRI Gateway Directly to a Central Office Switch
.323 terminal
IP network
Cisco chassis/unit
IP phone
Cisco Gateway
IP
PBX
NT1
device
Central Offic
switch
BRI
About Cisco Unified Videoconferencing3500Gateway
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Functionality
This section discusses the following topics:
• About PRI Gateway Call Handli ng Ca paci ty, page 1-11
• About BRI Gateway Call han dling Ca paci ty, page 1-11
• About Gateway Call Bandwid th Overhea d, page 1-11
• About Peer-to-Peer Connectivity, page 1-12
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522BRI Gateway and 3527 PRI Gateway Release 5.5
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Chapter 1 Functionality
About PRI Gateway Call Handling Capacity
Table 1-3 lists the maximum call handling capacity of the PRI gateway for different types of calls.
Table 1-3 PRI Gateway Call Handling Capacity
About Cisco Unified Videoconferencing 3500 Gateway Functionality
Call Type Maximum Number of
Calls Using 1 x E1 PRI
Line
voice (64 Kbps) 30 23
2B video (128 K bp s) 15 11
6B video (384 K bp s) 5 3
12B video (768 Kbps) 2 1
Note Enabling ISDN- to-I P D TMF de tect ion in t he PRI ga teway fo r vi deo c alls re duc es t he num be r of
supported calls by ha lf.
About BRI Gateway Call handling Capacity
Table 1-4 lists the maximum call ha ndli ng cap acit y of t he BRI gat eway for four BR I lines, ei ght
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
864 Kbps
Maximum Number of
Calls Using 1 X T1 PRI
Line
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 maxi mu m ca ll band widt h s inc lude p rovisio n f or cont ro l, audi o, vide o, a nd dat a t raffic.
• Video traffic on the ISDN side contains additional bits for error correction purposes which also
consume bandwid th. Video traffic on the IP side doe s n ot inc lude this addi tiona l l o ad.
• Opening an audio channel further reduces the bandwidth available to the video traffic.
For example, a call at 384 Kbps actually has onl y 363 Kbps available to it. Control and error correction
account for the rema ining 21 Kbps.
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522BRI Gateway and 3527 PRI Gateway Release 5.5
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