Patton electronic Switch 2701 I User Manual

USER  
MANUAL  
MODEL 2701/I  
G.703/G.704 NTU with  
10Base-T Ethernet  
Interface  
Important—This is a Class A device and is  
intended for use in a light industrial environ-  
ment. It is not intended nor approved for use  
in an industrial or residential environment.  
Part# 07M2701I-UM  
Doc# 08609U2-001  
Rev. I  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
Revised 2/18/08  
An ISO-9001Certified  
Company  
 
A
Specifications ........................................................................... 26  
A.1 Network Data Rate ...................................................................... 26  
A.2 Network Connector ..................................................................... 26  
A.3 Nominal Impedance ................................................................... 26  
A.4 Line Coding ................................................................................ 26  
A.5 Line Framing ............................................................................... 26  
A.6 CRC-4 Multiframing .................................................................... 26  
A.7 Clocking ...................................................................................... 26  
A.8 Time Slot Rate ............................................................................. 26  
A.9 Network Data Rates .................................................................... 26  
A.10 Distance ...................................................................................... 26  
A.11 Power Supply .............................................................................. 26  
A.12 Humidity ...................................................................................... 27  
A.13 Temperature ............................................................................... 27  
A.14 Dimensions ................................................................................. 27  
B
Ethernet 10Base-T Specifications........................................... 28  
B.1 DTE Interface .............................................................................. 28  
B.2 DTE Data Rates .......................................................................... 28  
B.3 LAn Connection .......................................................................... 28  
B.4 Protocol ....................................................................................... 28  
B.5 MAC Address Table Size ............................................................ 28  
B.6 MAC Address Aging ................................................................... 28  
B.7 Frame Buffer ............................................................................... 28  
B.8 Frame Latency ............................................................................ 28  
B.9 Diagnostics ................................................................................. 28  
B.10 Indicators .................................................................................... 28  
B.11 Configuration .............................................................................. 28  
C
Factory Replacement Parts and Accessories........................ 29  
3
 
1.0 WARRANTY & COMPLIANCE INFORMATION  
Patton Electronics warrants all Model 2701/I 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. 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 specif-  
ically disclaims all other warranties, expressed or implied, and the instal-  
lation or use of this product shall be deemed an acceptance of these  
terms by the user.  
1.1 COMPLIANCE  
EMC Compliance  
• EN55022, Class A  
• EN55024  
Safety Compliance:  
• EN 60950-1  
• AS/NZS 60950-1  
PSTN Regulatory Compliance:  
• TBR 12 & 13  
• AS/ACIF S016:2001  
4
 
1.2 CE NOTICE  
We certify that the apparatus identified in this document conforms to the  
requirements of Council Directive 1999/5/EC on the approximation of the  
laws of the member states relating to Radio and Telecommunication Ter-  
minal Equipment and the mutual recognition of their conformity.  
The safety advice in the documentation accompanying this product shall  
be obeyed. The conformity to the above directive is indicated by the CE  
sign on the device.  
1.3 AUTHORIZED EUROPEAN REPRESENTATIVE  
D R M Green  
European Compliance Services Limited.  
Oakdene House, Oak Road  
Watchfield, Swindon, Wilts SN6 8TD, UK  
1.4 SERVICE  
All warranty and nonwarranty repairs must be returned freight prepaid  
and insured to Patton Electronics. All returns must have a Return Mate-  
rials Authorization number on the outside of the shipping container. This  
number may be obtained from Patton Electronics Technical Services at:  
Tel: +1 (301) 975-1007  
Note Packages received without an RMA number will not be  
accepted.  
Patton Electronics' technical staff is also available to answer any ques-  
tions that might arise concerning the installation or use of your Patton  
Model 2701/I. Technical Service hours: 8AM to 5PM EST, Monday  
through Friday.  
5
 
1.5 SAFETY WHEN WORKING WITH ELECTRICITY  
• This device contains no user serviceable parts. The  
equipment shall be returned to Patton Electronics for  
repairs, or repaired by qualified service personnel.  
• The external power adapter shall be a listed Limited  
Power Source. Ensure that the power cable used meets  
all applicable standards for the country in which it is to  
be installed, and that it is connected to a wall outlet  
which has earth ground. The mains outlet that is uti-  
lized to power the devise shall be within 10 feet (3  
meters) of the device, shall be easily accessible, and  
protected by a circuit breaker.  
WARNING  
• Hazardous network voltages are present in WAN ports  
regardless of whether power to the unit is ON or OFF. To  
avoid electric shock, use caution when near WAN ports.  
When detaching the cables, detach the end away from  
the device first.  
• Do not work on the system or connect or disconnect  
cables during periods of lightning activity.  
In accordance with the requirements of council direc-  
tive 2002/96/EC on Waste of Electrical and Electronic  
Equipment (WEEE), ensure that at end-of-life you sepa-  
rate this product from other waste and scrap and deliver  
to the WEEE collection system in your country for recy-  
cling.  
This device is not intended to be connected to the public  
telephone network.  
WARNING  
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 or problems arise during  
installation or use of this product, please do not hesitate to contact Pat-  
ton Electronics Technical Support at (301) 975-1007.  
2.1 FEATURES  
Terminates G.703 and G.704, E1/fractional E1 service  
• Available in low-cost standalone or rack-mountable versions  
• n x 64 kbps data rates to 2.048 Mbps  
• 10Base-T Ethernet bridge  
• PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol  
(RFC 1638)  
• 75-ohm dual coax and 120-ohm twisted-pair G.703 connections  
• Local and remote loopback diagnostics  
• Internal and G.703 network timing  
• CE approval  
• 90-260VAC & 48VDC power options  
• Conforms to ONP requirements CTR 12 and CTR 13 for connection to  
international Telecom networks  
2.2 DESCRIPTION  
The Model 2701/I receives channelized G.704 (n x 64kbps) or clear  
channel E1/G.703 (2.048-Mbps) data from the telco's digital data net-  
work. The Model 2701/I terminates the G.703 telco interface and con-  
verts the data for transmission to a user-oriented 10Base-T (802.3)  
Ethernet interface.  
The Ethernet (Model 2701/I) supports an integrated 10Base-T (802.3)  
Ethernet port with transparent bridging capability for IP, IPX, DECnet,  
NetBIOS and other layer-3 protocols. The 2701/I attaches to the LAN  
and intelligently bridges data traffic to the large central site router  
through the telco's leased line network. The 2701/I supports PPP (RFC  
1661) and BCP (RFC 1638).  
7
 
The Model 2701/I is a 10Base-T bridge that operates over G.703/G.704  
lines. It uses MAC learning and forwarding to provide seamless LAN-to-  
LAN connectivity. As a result, corporate enterprises can connect their  
servers to a pair of NTUs and automatically forward data packets that are  
meant for the remote network. Local packets are filtered and passed only  
to the local LAN.  
8
 
3.0 PPP OPERATIONAL BACKGROUND  
PPP is a protocol used for multi-plexed transport over a point-to-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 con-  
nection; 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, config-  
ures 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 net-  
work 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 connec-  
tion 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.  
9
 
Figure 1. Cisco router with serial interface, configured as PPP Half 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 con-  
figuration 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 authen-  
tication is generally not required. If the foreign device requires authenti-  
cation 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 Inter-  
faces on Router A (e0 and e1) and the two Ethernet Interfaces on Router  
B (e0 and e1).  
Figure 2. Transparent bridging between two routers over a serial interface  
10  
 
4.0 CONFIGURATION  
The Model 2701/I features configuration capability via hardware DIP  
switches. This section describes all possible DIP switch configurations of  
the Model 2701/I.  
4.1 DIP SWITCH CONFIGURATION  
The Model 2701/I has two sets of internal DIP switches that allow config-  
uration for a wide range of applications. The sets of switches are  
accessed from the underside. Figure 3 shows the location of the DIP  
switches on the bottom of the printed circuit board.  
Figure 3. Underside of Model 2701/I, Showing Location of DIP Switches  
The Model 2701/I DIP switches (Switch Sets 1-2) can be configured as  
either “ON” or “OFF”. Figure 4 shows the orientation of the DIP switches  
with respect to ON/OFF positions.  
Figure 4. Close up of configuration switches  
11  
 
Switch SW1  
A detailed description of each switch (SW1-1 through SW1-5) setting fol-  
lows the summary table below:  
Switch SW-1 through SW1-5. Use Switches SW1-5 to set the DTE  
data rate.  
SW1 SW2 SW3 SW4 SW5  
Speed  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
Off  
On  
On  
On  
On  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
Off  
64 kbps  
128 kbps  
192 kbps  
256 kbps  
320 kbps  
384 kbps  
448 kbps  
512 kbps  
576 kbps  
640 kbps  
704 kbps  
768 kbps  
832 kbps  
896 kbps  
960 kbps  
1024 kbps  
1088 kbps  
1152 kbps  
1216 kbps  
1280 kbps  
1344 kbps  
12  
 
SW1 SW2 SW3 SW4 SW5  
Speed  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
On  
Off  
Off  
On  
On  
Off  
Off  
On  
On  
Off  
Off  
Off  
Off  
Off  
On  
On  
On  
On  
Off  
Off  
Off  
Off  
On  
On  
On  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
Off  
1408 kbps  
1472 kbps  
1536 kbps  
1600 kbps  
1664 kbps  
1728 kbps  
1792 kbps  
1856 kbps  
1920 kbps  
1984 kbps  
Clear Channel 2048 kbps  
Note When the data rate is set to 2.048Mb/s, the unit is forced into  
G.703 mode, and it transmits user data on all 32 time-lots.There  
is no framing information; therefore, the CRC4 MF (SW2-2)  
switch is ignored. In all other rate settings, the unit employs  
G.704 framing; TS0 is reserved for signaling.  
SW1-6  
SW1-7  
Clock Mode  
On  
On  
Off  
Off  
On  
Off  
On  
Off  
Network (Received Recovered)  
Internal  
Internal  
Network (Received Recovered)  
SW1-6 and SW1-7 Clock Modes.  
Network ClockTransmitter timing is derived using the received line  
signal (received recovered) from the network.  
Internal ClockTransmitter timing is derived from an internal clock  
source.  
13  
 
Switch SW2  
A detailed description of each switch (SW1-1 through SW1-5) setting fol-  
lows the summary table below:  
Switch SW2-1 Line Coding: HDB3 (default).  
Use Switch SW2-1 to control the Network Line Coding options. Set  
these options to be the same as the Line Coding given to you by your  
Service Provider. If you are using two Model 2701/Is together as short  
range modems, set both units to HDB3.  
SW2-1 Line Encoding  
Off  
On  
HDB3  
AMI  
Options: HDB3, AMI  
HDB3 In this line coding, the transmitter substitutes a deliberate bipo-  
lar violation when excessive zeros in the data stream are  
detected. The receiver recognizes these special violations and  
decodes them as zeros. This method enables the network to  
meet minimum pulse density requirements. Unless AMI is  
required in your application, HDB3 should be used whenever  
possible.  
AMI  
Alternate Mark Inversion defines a pulse as a “mark,” a binary  
one, as opposed to a zero. In an E1 network connection, signals  
are transmitted as a sequence of ones and zeros. Ones are  
sent as pulses, and zeros are sent as spaces, i.e., no pulse.  
Every other pulse is inverted from the previous pulse in polarity,  
so that the signal can be effectively transmitted. This means,  
however, that a long sequence of zeros in the data stream will  
14  
 
cause problems, since the NTU receiving the signal relies on  
the signal to recover the 2.048 Mb/s clock.  
If you must use AMI, you should ensure that the data terminal  
equipment connected to the unit provides a minimally accept-  
able pulse density. For this reason, there are advantages to  
using HDB3 instead. AMI coding does not inherently account for  
ones density. To meet this requirement, the user should ensure  
that the data inherently meets pulse density requirements.  
Switch SW2-2: CRC-4 Multiframe.  
In framed mode, SW2-2 is used for CRC-4 MF. When CRC-4 is enabled,  
the unit monitors the incoming data stream for CRC-4 errors. It transmits  
CRC-4 error counts to the transmitting unit. When using timeslot zero  
(TS0), excessive errors may cause loss of frame or loss of sync. If CRC-  
4 MF is used, both units must be set for set for CRC-4 MF. Otherwise, the  
one using CRC-4 MF will detect loss of sync.  
SW2-2  
Off  
On  
Option  
CRC-4 Disabled  
CRC-4 Enabled  
Note When the data rate is set to 2.048Mb/s, then the unit is forced  
into G.703 mode, and it transmits user data on all 32 time-lots.  
There is no framing information; therefore, the CRC4 MF (SW2-  
2) switch is ignored. In all other rate settings, the unit employs  
G.704 framing; TS0 is reserved for signaling.  
Switch SW2-3 Data Inversion.  
Set Switch S2-3 to determine whether or not the data stream from the  
local DTE is inverted within the Model 2701 before being passed to the  
G.703/G.704 network. An inverted data stream may be required when  
you use the Model 2701 to communicate with a G.703 device (that  
inverts the data) on the remote end. In typical installations, data inversion  
is not necessary.  
SW2-3  
Option  
Data not inverted  
Data inverted  
Off  
On  
Switch SW2-4: Remote Digital Loopback Type.  
The user can set this switch to select the type of remote loop that will be  
initiated by the Model 2701. If set to V.54, the Model 2701 will initiate a  
15  
 
V.54 loop when Remote Loop is selected by the front panel switches. If  
set to CSU, the Model 2701 will initiate a CSU loop when Remote Loop  
is selected by the front panel switches.  
S2-4  
Off  
On  
RDL Type  
Initiate a V.54 RDL loop when selected  
Initiate a CSU loopback when selected  
Switch SW2-5 Front Panel Switches.  
As the Front Panel Switches may be inadvertently toggled, or in the  
event that the end-user may not need to use the switches, the installer  
may disable the front panel switches. Set Switch S2-5 to determine  
whether the front-panel toggle switches are active or inactive.  
SW2-5  
Off  
On  
Option  
Front Panel Switches Enabled  
Front Panel Switches Disabled  
Switch SW2-6: V.54 Response Disabled (default).  
V.54 Response is a special in-band loopback facility that sends a  
pseudo-random pattern over the data stream. This is the only loopback  
that the unit can initiate. This is useful for campus applications when you  
need to put a remote unit in loopback.The unit responds to the V.54 loop-  
back command, and the whole process takes only a few seconds to com-  
plete. When V.54 Loopback is disabled, the unit will not be able to send  
or respond to V.54 loopback commands. The duration of the loopback is  
limited by the loopback timeout setting.  
SW2-6  
Off  
On  
Option  
V.54 Response Enabled  
V.54 Response Disabled  
16  
 
5.0 INSTALLATION  
The Interconnecting cables shall be acceptable for  
external use and shall be rated for the proper applica-  
tion with respect to voltage, current, anticipated tem-  
perature, flammability, and mechanical serviceability.  
WARNING  
Once the Model 2701/I is properly configured, it is ready to connect to  
the G.703/G.704 interface, to the Ethernet port, and to the power source.  
This section describes how to make these connections.  
5.1 CONNECTING TO THE G.703 NETWORK  
The Power, G.703/G.704 and Ethernet Line connections are located on  
the rear panel of the Model 2701/I. Figure 5 shows the location of each  
of these ports.  
Figure 5. Model 2701/I Rear Panel  
Connecting Dual Coaxial Cable (75 ohm) to the G.703 Network  
The Model 2701/I is equipped with dual female BNCs (TX and RX) for  
connection to a 75 ohm dual coax G.703 network interface. If your  
G.703/G.704 network terminates via dual coaxial cable, use the diagram  
below to make the proper connections. See Figure 6 below.  
Figure 6. Rear Panel, Showing Location of Connectors.  
Note The outer conductor of the coax cables are isolated from system  
earth ground.  
17  
 
When using the 75 Ohm interface, jumper straps JP2, JP6, and JP7  
must be installed over the jumpers. The jumpers are located next to the  
BNC connectors. Refer to the following section to open the case.  
Opening the Case  
Open the case by inserting a screwdriver into the slots and twist the  
screwdriver head slightly. The top half of the case will separate from the  
lower half of the case. Take caution not to damage any of the PC board  
mounted components.  
Connecting the Twisted Pair (120 ohm) to the G.703 Network  
The Model 2701/I is equipped with a single RJ-48C jack for connections  
to a 120 ohm twisted pair G.703/G.704 network interface. If your G.703/  
G.704 network terminates via RJ-48C, use the connection diagram  
(Figure 7) following the pinout and signals chart below to connect the  
120 ohm G.703/G.704 network channel.  
RJ-48C Jack  
Signal Name  
1
2
3
4
5
6
7
8
(RX) Receive (Ring)  
(RX) Receive (Tip)  
Shield  
(TX) Transmit (Ring)  
(TX) Transmit (Tip)  
Shield  
1
2
3
4
5
6
7
8
No connection  
No connection  
Figure 7. G.703/G.704 170 ohm Connection.  
18  
 
5.2 CONNECTING THE 10BASE-T ETHERNET PORT TO A PC  
(DTE)  
Figure 8. Connecting the 10Base-T Ethernet Port to a PC  
The 10Base-T interface is configured as DTE (Data Terminal Equip-  
ment). If the Model 2701/I is to to connect to another DTE device such  
as a 10Base-T network interface card, construct a 10Base-T crossover  
cable and connect the wires as shown in the diagram below (Figure 9).  
Figure 9. 10Base-T Cross-over Cable Connection  
5.3 CONNECTING THE 10BASE-T ETHERNET PORT TO A HUB  
The 10Base-T interface is configured as DTE (Data Terminal Equip-  
ment), just like a 10Base-T network interface card in a PC. Therefore, it  
“expects” to connect to a 10Base-T Hub using a straight-through RJ-45  
cable. Use the diagram below (Figure 10) to construct a cable to con-  
nect the 10 BaseT interface to a 10Base-T Hub.  
Figure 10. Connecting the 10Base-T Ethernet Port to a Hub  
19  
 
5.4 POWER CONNECTION  
Universal AC Power (100–240 VAC)  
The Model 2701/I uses a 5VDC, 2A universal input 100-240VAC, power  
supply (center pin is +5V). The universal input power supply has a male  
IEC-320 power entry connector. This power supply connects to the  
Model 2701/I by means of a barrel jack on the rear panel. Many interna-  
tional power cords are available for the universal power supply.  
The Model 2701/I powers up as soon as it is plugged into an AC outlet--  
there is no power switch..  
DC Power  
The 36-60 VDC DC to DC adapter is supplied with the DC version of the  
Model 2701/I. The black and red leads plug into a DC source (nominal  
48VDC) and the barrel power connector plugs into the barrel power sup-  
ply jack on the 2701/I. (See Figure 11).  
To Power  
To -48VDC  
Supply Jack  
Source  
-Vin  
Black lead (-V)  
Red lead (+V)  
+Vin  
Barrel power connector  
Figure 11. Connecting DC Power to the 2701 DC Power Supply.  
There are no user-serviceable parts in the  
power supply section of the Model 2701. Con-  
tact Patton Electronics Technical support at  
(301)975-1007, via our web site at http://  
WARNING  
ton.com, for more information.  
20  
 
6.0 OPERATION  
When the Model 2701/I has been properly configured and installed, it  
should operate transparently. This sections describes power-up, LED  
status monitors, and the built-in loopback test modes.  
6.1 POWER-UP  
Before applying power to the Model 2701/I, please read section 5.4,  
“Power Connection” on page 20 and ensure that the unit is properly con-  
nected to the appropriate power source..  
6.2 LED STATUS MONITORS  
The Model 2701/I features six front panel LEDs that monitor connections  
on the G.703/G.704 and 10BaseT links, signaling, error and test modes.  
Figure 10 (below) shows the front panel location of each LED. Descrip-  
tions of each LED follow Figure 12.  
Figure 12. 2701/I Front Panels  
E1 Link  
(Active Green) Solid green (On) indicates that the end to end E1  
Link is up, signifying that the link is active. The E1 Link LED is  
Off when the link is down.  
21  
 
10BT Link(Active Green)  
Solid green indicates that the 10BaseT Ethernet interface has  
detected a valid SQE heartbeat, signifying a valid 10BaseT  
connection.  
Status  
Blinks yellow from one to eleven times to indicate system sta-  
tus. Each pulse pattern is separated by a 2 second “off”  
period. Greater pulse patterns have higher priority (buffer sat-  
uration has greater priority than an empty MAC table). Valid  
system statuses are:  
1 pulse = system status is okay  
2 pulses = no MAC entries in the MAC Address Table  
3 pulses = Clear to Send (CTS) or Carrier Detect (DCD) from  
base unit are not asserted  
4 pulses = IM1/I buffer is saturated  
5 pulses = WAN receive frame(s) too large  
6 pulses = WAN receive frame(s) not octet aligned  
7 pulses = WAN receive frame(s) aborted  
8 pulses = Detected WAN receive frame(s) with CRC  
9 pulses = Detected LAN receive frame(s) too large  
10 pulses = Detected LAN receive frame(s) not octet aligned  
11 pulses = Detected LAN receive frame(s) with bad CRC  
LOS  
The Loss of Sync LED lights when the unit loses synchroniza-  
tion with the incoming signal. This may happen when there is a  
framing mismatch or a loss of signal. In unframed mode, the  
LOS LED monitors the status of the transmit clock.  
TM  
ER  
(Active Yellow) Solid Yellow indicates an Active Test Mode. The  
unit may be placed in test mode by the local user or by the  
remote user  
The error LED indicates various error conditions, including fram-  
ing bit errors, excessive zeros, controlled slips, severe errors, or  
bit errors (when sending V.52 test patterns). When sending a  
test pattern, the LED will remain lit if the unit does not receive  
the identical pattern. When it receives the correct pattern, the  
LED will turn off. If error insertion is on, the LED will blink once a  
second if everything is operating properly.  
22  
 
6.3 LOOP (V.54 & TELCO) DIAGNOSTICS  
The Model 2701/I offers three V.54 loop diagnostics. Use these diagnos-  
tics to test the NTU and any communication links. These tests can be  
activated via the front panel switches.  
Operating Local Loopback (LL)  
The Local Loopback (LL) test checks the operation of the local Model  
2701/I, and is performed separately on each unit.  
Figure 13. Local Loopback for a Network Termination Application  
To perform a LL test, follow these steps:  
1. Activate LL. This may be done by selecting local loop on the front  
panel switch.  
2. .Perform a V.52 BER (bit error rate) test as described on page 25. If  
the BER test equipment indicates no faults, but the data terminal  
indicates a fault, follow the manufacturer’s checkout procedures for  
the data terminal. Also, check the interface cable between the ter-  
minal and the Model 2701/I.  
23  
 
Operating Remote Digital Loopback (RL)  
The Remote Digital Loopback (RL) test checks the performance of both  
the local and remote NetLink-E1™, as well as the communication link  
between them. Any characters sent to the remote NetLink-E1™ in this  
test mode will be returned back to the originating device.  
Figure 14. Remote Loop in a Network Extension Application  
There are two Remote Loops that can be initiated from the NetLink 2701/  
I unit: (1) V.54 Loop, and; (2) CSU Loop. The user can select the type of  
loop that can be initiated by Switch S2-4. When a loopback is initiated  
this is the type of loop that the unit uses to loop up the remote unit and  
which type of loop the unit will respond to.  
To perform an RDL test, follow these steps:  
1. Activate RDL. This may be done by setting the front panel switch to  
‘Remote’.  
2. Perform a bit error rate test (BERT) using the internal V.52 genera-  
tor (as described on page 25), or using a separate BER Tester. If  
the BER test indicates a fault, and the Local Line Loopback test  
was successful for both NetLink™s, you may have a problem with  
the twisted pair line connection.  
CSU Loop  
Although CSU Loop is predominantly a T1 function, the NetLink-2701/I  
responds to central office initiated loop commands. Customers can use  
this facility when the Central Office network switch supports CSU loops  
over an E1 interface.  
When CSU Loop is selected, and when in D4 framing mode, the NetLink  
2701/I will implement the “loop up” command when it recognizes the pat-  
tern “10000” in the data stream for a minimum of 5 seconds. The “loop  
24  
 
down” command is implemented by the pattern “100” in the data stream  
for a minimum of 5 seconds.  
The NetLink 2701/I will respond to Universal Loopback De-activate to  
clear all central office loops.  
Using the V.52 (BER) Test Pattern Generator  
To use the V.52 BER tests in conjunction with the Remote Digital Loop-  
back tests (or with Local Line Loopback tests), follow these instructions:  
1. Locate the “511/511E” toggle switch on the front panel of the 2701/I  
and move it UP. This activates the V.52 BER test mode and trans-  
mits a “511” test pattern into the loop. If any errors are present, the  
local modem’s red “ER” LED will blink sporadically.  
2. If the above test indicates no errors are present, move the V.52 tog-  
gle switch DOWN, activating the “511/E” test with errors present. If  
the test is working properly, the local modem's red “ER” LED will  
blink once per second. A successful “511/E” test will confirm that  
the link is in place, and that the Model 2701/I’s built-in “511” genera-  
tor and detector are working properly.  
Note The above V.52 BER tests can be used independently of the  
Remote Digital Loopback tests. This requires two operators:  
one to initiate and monitor the tests at the local Model 2701/I,  
and one to do the same at the remote Model 2701/I. In this  
case, the test pattern sent by each Model 2701/I will not be  
looped back, but will be transmitted down the line to the other  
Model 2701/I. While one operator initiates test, the other moni-  
tors for errors.  
25  
 
APPENDIX A  
SPECIFICATIONS  
A.1 NETWORK DATA RATE  
2.048 Mbps  
A.2 NETWORK CONNECTOR  
RJ-48C/Dual Coax BNC  
A.3 NOMINAL IMPEDANCE  
75/120 ohm  
A.4 LINE CODING  
Selectable AMI or HDB3  
A.5 LINE FRAMING  
G.703 (Unframed) or G.704/G.732 (Framed)  
A.6 CRC-4 MULTIFRAMING  
Selectable On or Off  
A.7 CLOCKING  
Internal or Network (Receive Recover)  
A.8 TIME SLOT RATE  
64 kbps  
A.9 NETWORK DATA RATES  
64, 128, 192, 256, 320,384, 448, 512, 576, 640, 704, 768, 832, 896, 960,  
1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664,  
1728, 1792, 1856, 1920, 1984, 2048 kbps  
A.10 DISTANCE  
Maximum 1.6 km (5,250 ft.) on 24 AWG Cable  
A.11 POWER SUPPLY  
+5 VDC External power supply/100–240 VAC, 50–60Hz, 0.4A  
26  
 
A.12 HUMIDITY  
Up to 90% non-condensing  
A.13 TEMPERATURE  
0 to 50°C (32 to 122°F)  
A.14 DIMENSIONS  
Plastic Case – 9.0L x 5.3W x 2.0H cm (3.5L x 2.1W x 0.78H in.)  
Metal Case – 3.2L x 13.8W x 14.6H cm (1.25L x 5.43W x 5.75H in)  
27  
 
APPENDIX B  
ETHERNET 10BASE-T SPECIFICATIONS  
B.1 DTE INTERFACE  
10Base-T on RJ-45F  
B.2 DTE DATA RATES  
10Mbps  
B.3 LAN CONNECTION  
RJ-45, 10Base-T, 802.3 Ethernet  
B.4 PROTOCOL  
PPP (RFC 1661) with Bridging Control (RFC 1638)  
B.5 MAC ADDRESS TABLE SIZE  
4096 entries  
B.6 MAC ADDRESS AGING  
MAC addresses deleted after 8 minutes of inactivity  
B.7 FRAME BUFFER  
512 Frames  
B.8 FRAME LATENCY  
1 frame  
B.9 DIAGNOSTICS  
6V.54 Loopback; CSU Loopback; V.52 Patterns: 511  
B.10 INDICATORS  
E-1 Link, 10Base-T Link, Ethernet Status, Loss of Frame Sync, Error,  
Test Mode  
B.11 CONFIGURATION  
Two 8-Position DIP Switches  
28  
 
APPENDIX C  
FACTORY REPLACEMENT PARTS AND ACCESSORIES  
Patton Model #  
Description  
2701/B  
G.703/G.704 NTU with RS-530 interface  
G.703/G.704 NTU with a V.35 interface  
G.703/G.704 NTU with an X.21 interface  
G.703/G.704 NTU w/ 10Base-T EN interface  
Universal Input Power Supply  
2701/C  
2701/D  
2701/I  
08055DCUI  
07M2701  
User Manual  
29  
 
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Copyright © 2008  
Patton Electronics Company  
All Rights Reserved.  
32  
 

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