NetStream

Indoor Unit – E1

Netronics NetStream IDU – E1 2

NetStream IDU – E1

NetStream systems deliver carrier-class native E1/T1 + Ethernet in a single platform, making them ideal for a range of backhaul and access applications. Up to 16 E1/ T1 services are supported, depending on model.

TDM Services Up to 16xE1/16xT1 interfaces in the indoor units (NetStream 5x200)

Standard E1/T1, compliant with ITU-T standards

Unframed E1/T1

BER < 1x10-11 @ sensitivity threshold

Accurate clock recovery mechanism (<50 PPB)

One way delay < 8 msec

Advanced clock configurations

Configurable jitter buffer

TDM Services selection To select services:

1. Click the Configure button. The TDM services dialog is displayed:

Figure 1: TDM Type selection

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2. Using the TDM Type radio buttons, choose E1 or T1. You are now able to select the

required service ports:

Figure 2: TDM service port selection

3. Use the spin button to choose consecutive service ports, the Select Maximum button to

choose all available ports or click on individual ports to choose them.

• Ethernet is always selected. • The maximum available services will be reduced in accordance with

Note actual air interface capacity.

Figure 3: TDM Service port selection - seven services selected

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4. Click OK. You are returned to the Services and rates dialog of Figure 5. It is updated to reflect

your choice.

Figure 4: Services and Rates - Services chosen

The selected ports will be enabled for both sides of the link. You cannot for example, use ports 1, 3, 5, 7 on one side and 2, 4, 6, 8 on the other.

Modulation Rate Selection You may choose a specific modulation rate or use Adaptive. Figure 6-5: Services and Rates dialog: Available rates

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To choose a modulation rate:

1. Choose Adaptive or one of the available rates.

2. Click Evaluate to continue or click the TDM Jitter Buffer tab to set the TDM Jitter Buffer (see next section).

The service is activated as show below:

You are returned to the Services and rates dialog of Figure 4.

Setting Monitored Hot Standby Mode If you are not using Hot Standby Mode, you may skip this section. To install and use the Hot Standby feature, see Chapter 15 of System Manual. The following procedure can be used to switch links between primary and secondary or to disable the mode. To set the Hot Standby Mode:

1. Click the Hot Standby tab. The following dialog appears:

Figure 6: Choosing Hot Standby Mode

2. Click the radio button to make this link primary or secondary.

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Setting the TDM Jitter Buffer To set the TDM Jitter Buffer size:

1. Click the TDM Jitter Buffer tab. The following dialog appears:

Figure 7: TDM Jitter Buffer Configuration

• The receiver jitter buffer for each site can be enlarged, thereby increasing system resistance to interference (the

larger the jitter buffer, the longer the interference period that the system will overcome without TDM errors).

• You can also decrease the jitter buffer to decrease the system delay. • The jitter buffer can be configured between 2.0 and 16.0 ms. • After setting the new value you must evaluate the expected quality. During the

evaluation the TBFR (TDM Block Failure Ratio) bar is displayed. You select either Next, which performs the change or Back to cancel the change. Notice that the Jitter Buffer is configured per site.

Figure 8: TDM Jitter Buffer Configuration - TBFR evaluation bar

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2. After setting the jitter buffer size, if grayed out, the Evaluate button is enabled while both Back and Next are disabled as shown in the next figure: Figure 9: Services and TDM delay set - link ready for evaluation

3. You may make any further changes to the Service Configuration or the Jitter

buffer. When you are satisfied, click the Evaluate.

The optimum transmission rate for the selected services is evaluated.

Following a short delay for processing, Back and Next are enabled.

4. Click Next to continue. TDM Clock Configuration Using E1 TDM Ports The following dialog is displayed:

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Figure 10: TDM Parameters Configuration (1) To configure TDM clock parameters:

1. For any individual port, click it. For the same parameters for all ports, click the Select Maximum tag.

• Select Maximum will select the maximum number of services that

were configured for the air interface for configuration • Deselect All unconditionally deselects all of the services for

configuration • Without selecting anything, right-clicking any port will cause the

appearance of the drop down list of Figure 11 below

2. Click Configure. The following drop down list is displayed:

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Figure 11: TDM Parameters Configuration (2)

3. Click the required parameter. Their meanings are as follows:

Please keep in mind that what follows is per port. Note

Figure 12: TDM Parameters

Transparent/Transparent

The clock at Site A regenerates the clock from Site B and vice versa.

Loop time/Recover

The Site A port receive clock is used as the transmit clock for that port on both sides of the link.

Recover/Loop time

The Site B port receive clock is used as the transmit clock for that port on both sides of the link.

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Internal/Recover

The Site A port uses its internal oscillator to generate its transmit clock while the Site B port regenerates the clock received at the Site A port.

Recover/Internal

The Site B port uses its internal oscillator to generate its transmit clock while the Site A port regenerates the clock received at the Site B port.

Mousing-over any port causes a pop-up help ballon:

4. You may configure the E1 ports to unbalanced mode (75 ohm). You should configure both

sides of the link as balanced or unbalanced.

Figure 13 shows an adapter cable for connecting devices with balanced E1 interface to the user equipment with unbalanced E1 interface. The Y splitter cable includes one RJ-45 balanced connector (left) and two unbalances BNC coaxial connectors (right).

Figure 13: Unbalanced E1 adapter cable (Y Splitter)

See below for further technical details.

5. Click Finish to complete the wizard.

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Using T1 TDM Ports If you are using T1 (or international equivalents), the Clock Configuration is a little different: Figure 14: TDM T1 Parameters Configuration Here you should also chose the Line Code and Impedance. Some regulatory areas (such as Japan) require 110 Ohm line impedance.

TDM Loopbacks Internal and external loopbacks on both sites of a link are used to test the TDM connections To activate a loopback:

1. From the Maintenance menu, choose Loop backs... or right-click the TDM display in the main window.

The Loopbacks dialog box appears:

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Figure 15: Loopback configuration box

2. From the active ports, click those required for loopback activation. The selected port icons change color to light blue as in the following example:

Figure 16: Loopback configuration box with one Site A port selected

3. Click configure to choose a loopback mode:

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Figure 17: Loopback options

4. Click the required loopback mode. Figure 18: Loopback defined

5. Click OK to activate the selected loopback(s).

This activates selected loopback(s). The corresponding service port icon changes color and appearance to indicate an active loopback.

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Figure 19: Site A port 2 set to loopback To deactivate a loopback:

• Return to the situation of Figure 17 and click None.

When a loopback is deactivated, the corresponding icon in Figure 19 reverts to its previous state (like the right side of the figure).

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Wiring Specifications ODU-IDU Cable The ODU-IDU cable is shielded/outdoor class CAT 5e, 4 twisted-pair 24 AWG terminated with RJ-45 connectors on both ends. A cable gland on the ODU side provides hermetic sealing. The following table shows the connector pin out: Table 1: ODU-IDU RJ-45 Connector Pin out

Function Color IDU ODU

Ethernet (RxN) White/Green 1 1

Ethernet (RxT) Green 2 2

Ethernet (TxT) White/Orange 3 3

Ethernet (TxN) Orange 6 6

Power (+) Blue 4 4

Power (+) White/Blue 5 5

Power ( ) White/Brown 7 7

Power ( ) Brown 8 8

User Port Connectors LAN Port The LAN 10/100BaseT interface terminates in an 8-pin RJ-45 connector, wired in accordance to Table 2. Table 2: Fast Ethernet Connector Pinout

Function Signal Pin

Transmit Data (positive) TD (+) 1

Transmit Data (negative) TD (–) 2

Receive Data (positive) RD (+) 3

Receive Data (negative) RD (–) 6 Trunk Ports - E1/T1 RJ45 Connector The E1/T1 interfaces terminate in 8-pin RJ-45 connectors, as shown in Table 3 below:

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Table 3: Trunk Ports - E1/T1 RJ45Pinout

Function Signal Pin

Transmit Data Tip TxTip 1

Transmit Data Ring TxRing 2

Receive Data Tip RxTip 4

Receive Data Ring RxRing 5

Hot Standby Port RJ-11 Table 4: Hot Standby RJ-11 Port Pinout Pin Pin

Signal Side Side A B

HSB out 1 2

HSB in 2 1

Ground 3 3

Ground 4 4

IDU (all models) Alarm Connector The IDU Alarm interface is a 25 pin D type female connector. Its pin out is listed in Table 5. Table 5: IDU Alarm Connector (Dry Contact)

I/O Description Pin

Input 1 Positive 14

Input 1 Negative 15

Input 2 Positive 16

Input 2 Negative 17

Input 3 Positive 18

Input 3 Negative 19

Input 4 Positive 20

Input 4 Negative 21

Output 1 Normally Open 1

Output 1 Common 2

Output 1 Normally Closed 3

Output 2 Normally Open 4

Output 2 Common 5

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Output 2 Normally Closed 6

Output 3 Normally Open 7

Output 3 Common 8

Output 3 Normally Closed 9

Output 4 Normally Open 10

Output 4 Common 11

Output 4 Normally Closed 12

The figure below, shows how to connect external input and output alarms.

• Use an external current limit resistor to limit the current at the output relays to 1 Amp. Such resistor is not required if the equipment connected to the IDU supports current limiting to 1 Amp.

• The voltage of the input alarm must be within the range of -10 to -50 VDC..

Figure 20: Example for connecting the alarm connector

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DC Power Terminals IDU-NetStream RM & IDU-NetStream DT Table 6: Terminal Block 3-pin -48 VDC

Function Pin

+ Right

Chassis Center

– Left

DC PoE Table 7: Terminal Block 2-pin -48 VDC

Function Pin

+ Right

– Left

Unbalanced Mode for E1 Interface You may configure the E1 interface to unbalanced mode (75 ohm) using the Link Manager. Figure 21 shows an adapter cable for connecting devices with balanced E1 interface to the user equipment with unbalanced E1 interface. The Y splitter cable includes one RJ-45 balanced connector (left) and two unbalances BNC coaxial connectors (right). Figure 21: Unbalanced E1 adapter cable (Y Splitter)

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Figure 22 provides a schematic: Figure 22: Unbalanced E1 adapter cable (Y Splitter) - schematic Table 8: E1 Y Splitter Pin out for Unbalanced Mode

BNC Color Code RJ-45 Connector Pin

Connector

2 (NGND) Red

1, 4, 7, 8

1 (Center) 2

2 (NGND) Green

1, 4, 7, 8

1 (Center) 5

The Y-splitter cable cannot be used as a balanced to unbalanced converter. The cable merely provides a physical interface conversion without any impedance matching. Some devices automatically detect cable insertion and change the impedance internally.