Patton electronics 2720, 2720/I User Manual
USER
MANUAL
MODEL 2720/I
T1/Fractional T1 CSU/DSU
with Ethernet Bridging
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
http://www.patton.com
Part# 07M2720/I-A
Doc#086181UA
Revised 04/11/01
CERTIFIED
An ISO-9001
Certified Company
1 2
TABLE OF CONTENTS
Section
Page
1.0 Warranty Information.............................................................2
1.1 Warranty Statement
1.2 Radio and TV Interference
1.3 Equipment Attachment Limitations
1.4 FCC Compliance
1.5 Service Information
2.0 General Information...............................................................4
2.1 Features
2.2 General Product Description
3.0 Configuration .........................................................................5
3.1 DIP Switch Configuration
3.2 Software Configuration
4.0 Installation ..........................................................................32
4.1 The Model 1001R14 Rack Chassis
4.2 Installing the Interface Driver Board
4.3 Installing the 2720 Into the Rack Chassis
4.4 Connecting to a DTE Device
4.5 Connecting to a DCE Device
4.6 Connecting the T1 Interface
5.0 Operation.............................................................................36
5.1 LED Descriptions
5.2 Loop (V.54 & Telco) Diagnostics
5.3 Bit Error Rate (V.52) Diagnostics
Appendix A - Specifications........................................................41
Appendix B - Cable Recommendations......................................42
Appendix C - Factory Replacement Parts and Accessories ......43
Appendix D - T1 Interface Pin Assignments ..............................44
Appendix E - DTE Interface Pin Assignments ............................45
1.0 WARRANTY INFORMATION
Thank you for your purchase of this Patton Electronics product. This
product has been thoroughly inspected and tested and is warranted for One
Year parts and labor. If any questions or problems arise during installation
or use of this product, please do not hesitate to contact Patton Electronics
Technical Support at (301) 975-1007.
1.1 WARRANTY STATEMENT
Patton Electronics warrants all Model 2720 Series components to be
free from defects, and will—at our option—repair or replace the product
should it fail within one year from the first date of shipment. This warranty is
limited to defects in workmanship or materials, and does not cover customer damage, abuse, or unauthorized modification. This product contains
no serviceable parts; therefore you should not attempt to modify the unit in
any way. If this product fails or does not perform as warranted, your sole
recourse shall be repair or replacement as described above. Under no condition shall Patton Electronics be liable for any damages incurred by the
use of this product. These damages include, but are not limited to, the following: lost profits, lost savings and incidental or consequential damages
arising from the use of or inability to use this product. Patton Electronics
specifically disclaims all other warranties, expressed or implied, and the
installation or use of this product shall be deemed an acceptance of these
terms. In the event that you detect intermittent or continuous product malfunction due to nearby high power transmitting radio frequency equipment,
use only data cables with an external outer shield bonded to a metal or
metalized connector.
1.2 RADIO AND TV INTERFERENCE
The NetLink-T1™ Model 2720 Series generates and uses radio frequency energy, and if not installed and used properly—that is, in strict
accordance with the manufacturer's instructions—may cause interference to
radio and television reception. The Model 2720 Series has been tested and
found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which
are designed to provide reasonable protection from such interference in a
commercial installation. However, there is no guarantee that interference
will not occur in a particular installation. If the Model 2720 Series causes
interference to radio or television reception, which can be determined by
disconnecting the cables, try to correct the interference by one or more of
the following measures: moving the computing equipment away from the
receiver, re-orienting the receiving antenna, and/or plugging the receiving
equipment into a different AC outlet (such that the computing equipment
and receiver are on different branches).
WARNING! This device is not intended to be con-
nected to the public telephone network in Europe.
43
1.3 INDUSTRY CANADA NOTICE
The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets
certain telecommunications network protective, operational and safety
requirements. The Department does not guarantee the equipment will
operate to the user's satisfaction.Before installing this equipment,
users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must
also be installed using an acceptable method of connection. In some
cases, the company’s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that
compliance with the above condition may not prevent degradation of
service in some situations. Repairs to some cer tified equipment should
be made by an authorized maintenance facility designated by the supplier.Any repairs or alterations made by the user to this equipment, or
equipment malfunctions, may give the telecommunications company
cause to request the user to disconnect the equipment. Users should
ensure for their own protection that the ground connections of the
power utility, telephone lines and internal metallic water pipe system,
are connected together. This protection may be particularly important
in rural areas.
1.4 FCC INFORMATION
The Model 2720 Series has been tested and registered in compliance with the specifications in Part 68 of the FCC rules. A label on the
equipment bears the FCC registration number. You may be requested
to provide this information to your telephone company. Your telephone
company may make changes in its facilities, equipment, operations or
procedures that could affect the proper operation of the Model 2720
Series. If this happens, the telephone company should give you
advance notice to prevent the interruption of your service.The telephone company may decide to temporarily discontinue your service if
they believe your Model 2720 Series may cause harm to the telephone
network. Whenever possible, they will contact you in advance. If you
elect to do so, you have the right to file a complaint with the FCC. If
you have any trouble operating the Model 2720 Series, please contact
Patton Electronics Technical Support 301-975-1000. The telephone
company may ask you to disconnect the equipment from the telephone
network until the problem has been corrected or until you are certain
that the Model 2720 Series is not malfunctioning. In accordance with
FCC rules and regulation CFR 47 68.218(b)(6), you must notify the
telephone company prior to disconnection.The following information
may be required when applying to your local telephone company for
leased line facilities.The Universal Service Order Code (USOC) is
RJ48.The Facility Interface Codes (FIC) are 04DU9-BN, 04DU9-DN,
04DU9-1KN, and 04DU9-1SN.The Service Order Code (SOC) is 6.0N.
1.5 FCC PART 68 COMPLIANCE STATEMENT
This equipment complies with Part 68 of FCC Rules. Please note the
following:
1. You are required to request serivce from the telephone company
before you connnect the CSU to a network. When you request serivce,
you must provide the telephone company with the following data.When
you request T1 Service, you must provide the telephone company with
the Facility Interface Code.Provide the telephone company with both of
the following codes:04DU9-B (1.544 MB D4 framing format) and
04DU9-C (1.544 MB ESF format).The telephone company will select
the code it has available. The Ser vice Order Code(s) (SOC): 6.0N. The
required Universal Service Order Code (USOC) jack: RJ 48C.The
make, model number, and FCC Registration number of the CSU.
2. Your telephone company may make changes to its facilities, equipment, operations, or procedures that could affect the proper functioning
of your equipment. The telephone company will notify you in advance
of such changes to give you and opportunity to maintain uninterrupted
telephone service.
CAUTION: Users should not attempt to make such connections
themselves, but should contact the appropriate electric inspection
authority, or electrician, as appropriate.
Facility
Interface Service Network
Service Code Code Connection
1.544 Mbps SF format without line power 04DU9-BN 6.0N RJ48C
1.544 Mbps SF and B8ZS without line power 04DU9-DN 6.0N RJ48C
1.544 Mbps ANSI ESF without line power 04DU9-1KN 6.0N RJ48C
1.544 Mbps ANSI ESF and B8ZS w/o line power 04DU9-1SN 6.0N RJ48C
5
6
2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions arise during installation or use of the unit, contact Patton Electronics Technical Services at
(301) 975-1007.
2.1 FEATURES
• Terminates T1/FT1 Circuits over a 4-Wire RJ-48C interface
• 10Base-T Ethernet bridge
• PPP (Point to Point Protocol, RFC 1661) with Bridge Control
Protocol (RFC 1638)
• Unstructured Rates at 1.544 Mbps
• D4 or ESF Framing Modes
• Supports AMI or B8ZS/B7ZS Line Coding
• Configuration via Software Control Port or Internal DIP Switches
• Six Easy-to-Read LED Indicators Monitor Data & Diagnostics
• Internal or Receive Recover Clocking
• Also Operates as a High-Speed Point-to-Point Modem
• Made in USA
2.2 GENERAL PRODUCT DESCRIPTION
The
NetLink-T1™
Model 2720/I is a single port T1/FT1 CSU/DSU
with Ethernet Bridging that provides high-speed LAN-to-WAN connectivity. Plugging directly into the 10Base-T port of a hub or LAN switch,
the NetLink-T1™ provides T1 or FT1 access at connection data rates
of 1.544 Mbps, nx64, and nx56 (n=1 to 24 channels). The NetlinkT1™ is an excellent choice for internet access as well as LAN-to-LAN
services.
The Netlink-T1™ provides digital access to a local WAN service
provider or directly between two facilities over a dedicated 4-Wire circuit. WAN bandwidth, framing and coding options are programmed via
externally accessible DIP switches or via a VT-100 type terminal using
the rear-mounted EIA-232 Control Port. Netlink-T1™ supports D4/ESF
framing options and AMI/B8ZS/B7ZS line coding. Netlink-T1™ also
supports a full range of system and diagnostic features that make system setup easy. The Ethernet Bridge in this unit requires no configuration at all.
The NetLink-T1™ provides T1 terminations over a modular RJ-48C
jack and comply with jitter tolerance capabilities as specified in ANSI
T1.403 and AT&T TR62411. External power options include 120VAC
and universal interface 100-240VAC. 48VDC and rack card versions
are also available.
3. If your CSU causes harm to the telephone network, the telephone
company may temporarily discontinue your service. If possible, they will
notify you in advance, but if advance notice is not practical, you will be notified as soon as possible and will be informed of your right to file a complaint
with the FCC.
4. If you experience trouble with the CSU, please contact Patton
Electronics, Co.for service or repairs. Repairs should be performed only by
Patton Electronics Co.
5. You are required to notify the telephone company when you disconnect
the CSU from the network.
1.6 SERVICE INFORMATION
All warranty and non-warranty repairs must be returned freight prepaid
and insured to Patton Electronics. All returns must have a Return Materials
Authorization number on the outside of the shipping container. This number
may be obtained from Patton Electronics Technical Support at: tel: (301)
975-1007 email: support@patton.com www: http://www.patton.com.
NOTE: Packages received without an RMA number will not be accepted.
Patton Electronics' technical staff is also available to answer any questions
that might arise concerning the installation or use of your Patton Model
2720. Technical Support hours: 8AM to 5PM EST,Monday through
Friday.
1.7 CE NOTICE
The CE symbol on your Patton Electronics equipment indicates that it
is in compliance with the Electromagnetic Compatibility (EMC) directive and
the Low Voltage Directive (LVD) of the European Union (EU). A Certificate
of Compliance is available by contacting Technical Support.
7
3.0 PPP Operational Background
PPP is a protocol used for multi-plexed transport over a pointto-point link. PPP operates on all full duplex media, and is a symmetric peer-to-peer protocol, which can be broken into three main
components: 1. A standard method to encapsulate datagrams
over serial links; 2. A Link Control Protocol (LCP) to establish, configure, and test the data-link connection; 3. A family of Network
Control Protocols (NCPs) to establish and configure different network layer protocols.
In order to establish communications over a point-to-point link,
each end of the PPP link must first announce its capabilities and
agree on the parameters of the link’s operation. This exchange is
facilitated through LCP Configure-Request packets.
Once the link has been established and optional facilities have
been negotiated, PPP will attempt to establish a network protocol.
PPP will use Network Control Protocol (NCP) to choose and configure one or more network layer protocols. Once each of the network layer protocols have been configured, datagrams from the
established network layer protocol can be sent over the link. The
link will remain configured for these communications until explicit
LCP or NCP packets close the link down, or until some external
event occurs.
The PPP Bridging Control Protocol (BCP), defined in RFC
1638, configures and enables/disables the bridge protocol on
both ends of the point-to-point link. BCP uses the same
packet exchange mechanism as the Link Control Protocol
(LCP). BCP is a Network Control Protocol of PPP, bridge
packets may not be exchanged until PPP has reached the
network layer protocol phase.
3.1 APPLICATIONS
In situations where a routed network requires connectivity
to a remote Ethernet network, the interface on a router can
be configured as a PPP IP Half Bridge. The serial line to the
remote bridge functions as a Virtual Ethernet interface, effectively extending the routers serial port connection to the
remote network. The bridge device sends bridge packets
(BPDU's) to the router's serial interface. The router will
receive the layer three address information and will forward
these packets based on its IP address.
Figure 1 shows a typical Cisco router with a serial interface
configured as a PPP Half Bridge. The router serial interface uses
a remote device that supports PPP bridging to function as a node
on the remote Ethernet network. The serial interface on the
Cisco will have an IP address on the same Ethernet subnet as
the bridge.
For example, the customer site is assigned the addresses
192.168.1.0/24 through 192.168.1.1/24. The address
192.168.1.1/24 is also the default gateway for the remote network. The above settings remove any routing/forwarding intelligence from the CPE. The associated Cisco configuration will
set serial interface (s0) to accommodate half bridging for the
above example.
Authentication is optional under PPP. In a point-to-point
leased-line link, incoming customer facilities are usually fixed
in nature, therefore authentication is generally not required. If
the foreign device requires authentication via PAP or CHAP,
the PPP software will respond with default Peer-ID consisting
of the units Ethernet MAC address and a password which
consists of the unit’s Ethernet MAC address.
Some networking systems do not define network numbers
in packets sent out over a network. If a packet does not have
a specific destination network number, a router will assume
that the packet is set up for the local segment and will not forward it to any other sub-network. However, in cases where
two devices need to communicate over the wide-area, bridging can be used to transport non-routable protocols.
Figure 2 illustrates transparent bridging between two
routers over a serial interface (s0). Bridging will occur
between the two Ethernet Interfaces on Router A (e0 and e1)
and the two Ethernet Interfaces on Router B (e0 and e1).
Patton
2720
Bridge
Ethernet LAN
PEC Device w/ Serial I/F
Router
Figure 1. Cisco router with serial interface, configured as PPP Half Bridge.
!
no ip routing
!
interface Ethernet0
ip address 1.1.1.1 255.255.255.0
bridge-group 1
!
interface Serial0
ip address 1.1.1.1 255.255.255.0
encapsulation PPP
bridge-group 1
!
interface Serial1
ip address 2.2.2.2 255.255.255.0
bridge-group 1
!
bridge 1 protocol ieee
!
Router A
Router B
e0
e0
S1
e1
S1
S0
S0
LAN
LAN
LAN
LAN
LAN
Serial Interface
Serial Interface
Using Bridge-Groups, multiple remote LANs can be
bridged over the wide-area.
8
2720/I
2720/I
T1/FT1 Link
T1/FT1 Link
Figure 2. Transparent bridging between two routers over a serial interface.
Line Framing Options:
D4/Superframe: The D4 framing format, as specified in AT&T
TR62411 is the standard in which twelve frames make up a
superframe. All signaling and synchronization are done inband.
Extended Superframe (ESF): Extended Superframe, as speci-
fied in AT&T TR 54016, consists of twenty-four (24) T1
frames. The framing bits are now used for framing, CRC and
the Facility Data Link (FDL). The FDL allows maintenance
messages and information to be passed between the 2720
and the Central Office.
Line Coding Options:
Alternate Mark Inversion (AMI): This mode does not inherently
account for ones density. To meet this requirement, each time
slot can be reduced to 56 kbps and the Least Significant Bit
(LSB) of each time slot set to one.
Bipolar 8 Zero Substitution (B8ZS): This mode assures proper
bit density in the data stream. In this mode any data pattern
can be transmitted without causing ones density errors. This
mode allows for 64 kbps clear channel timeslots.
Switch S2-5: DS0 Channel Rate
Use Switch S2-5 to set the DS0 rate.
SW2-5
Setting
Off 56 kbps
On 64 kbps
3.1.1 Switch S2
The table below shows the default configurations for Switch S2. A
description of all S2 options follows this table.
Switches S2-1, S2-2, and S2-3
Use Switches S2-1, S2-2 and S2-3 to set the DTE data rate.
Each setting represents an nx56/nx64 setting. Individual channel settings can be configured through the software control port.
S2-1
S2-2 S2-3 Speed
Off Off Off Clear Channel (Unframed)
On Off Off 112kbps/128kbps
Off On Off 224kbps/256kbps
On On Off 336kbps/384kbps
Off Off On 448kbps/512kbps
On Off On 672kbps/768kbps
Off On On 896kbps/1024kbps
On On On 1344kbps/1536kbps
Switch S2-4: Line Framing and Coding
Use Switch S2-4 to control the Network Line Framing and Coding
Options. Set these options to be the same as the Line Framing and
Coding Options given to you by your Service Provider. If you are using
two Model 2720s together as short range modems, set both units identically.
S2-4
Line Framing & Coding
Off ESF/B8ZS
On D4/AMI
9
10
S2 SUMMARY TABLE
Position Function Factory Default Selected Option
S2-1 Data Rate On
S2-2 Data Rate On
S2-3 Data Rate On
S2-4 Framing & Coding Off
S2-5 DS0 Rate On
S2-6 Clock Mode Off
S2-7 Clock Mode Off
S2-8 Reserved Off
1.536 Mbps
(DTE Rate)
ESF/B8ZS
64 kbps
Network
Reserved
Network
11
12
Switch S2-6 and S2-7: Clock Mode
Set Switch S2-6 and S2-7 to determine the 2720’s transmitter tim-
ing.
S2-6
S2-7 Clock Mode
Off Off
Network Clock
. Transmitter timing is
derived from the received line signal.
On Off
Internal Clock
. Transmitter clock is
derived from an internal oscillator.
NOTE 1: When using the Model 2720 as a high-speed short
range modem, one unit of the link must be configured in Internal
Clock mode, and the opposite end unit must be configured for
Network Clock mode.
If the ERR LED on the front of the unit is flashing (or on) it could
be an indication of a clocking problem.Double check your clock
mode settings and Tx Clock Invert S1-3 settings.
Switch S2-8 Reserved
3.1.2 Switch S1
The chart below shows the default configurations for Switch S1. A
description of all S1 options follows this table.
Switch S1-1: RDL Type
Switch S1-1 selects the type of Remote Digital Loopback that the
2720 will initiate when the RDL is initiated from this unit. The 2720
will respond to both the V54 and the CSU loopback regardless of the
setting of S1-1
S1-1
RDL Type
On Initiate a V.54 RDL loop when selected
Off Initiate a CSU loopback when selected
Switch S1-2: Reserved
S1 SUMMARY TABE
Position Function Factory Default Selected Option
S1-1
RDL Type
On
S1-2
Reserved
On
S1-3
Tx Clock Invert
Off
S1-4
Line Build Out
Off
S1-5 Off
S1-6
Reserved
Off
S1-7
Reserved
Off
S1-8 Reserved Off
V.54 RDL
Normal
0dB
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