Specifications

Section 520-10S-WI3-203
030-101591 Rev. B
R
8
0806I3RB
- NOTE -
When configured as an office repeater, the NET REGEN option is al-
ways enabled and the NET REGEN LED illuminates. Also, while set
for the office repeater mode, the CLOS ID and ESF Only options are
bypassed and those LEDs are off. Even though the CLOS ID is off,
upon detecting a loss of signal from the CPE, the unit sends an AIS
toward the network.
4.1.1 Span Power (Office Repeater Mode)
The unit provides power to the span via simplex current on the
CPE RCV and XMT pairs. Simplex Current is regulated at
60mA with a maximum of 35Vdc. This voltage equates to a re-
sistance design limit of 583 Ohms. The 520-10SWI3 can span
power an NIU (250-ohms resistance) at the distances as shown
in Table 3.
Cable Type Operating Distance
22 Gauge @ 90_F
6383 Feet @ 30dB Signal
24 Gauge @ 90_F
5085 Feet @ 30dB Signal
26 Gauge @ 90_F
3750 Feet @ 30dB Signal
Table 3. Span Power Operating Distances
The unit can power an NIU beyond the distances in Table 3, but
the operating distances are limited by the office repeater and
the customer’s CSU ability to recover the DS1 signal (30dB,
typical). Operating distances that are greater than 3500 feet re-
quire the use of a repeater.
4.1.2 Span Power Disable (Office Repeater Mode)
The 520-10SWI3 can be locally provisioned to disable the regen-
eration of power to the span. When this option is selected, the
CPE-side interface isolation transformers removes power and
replaces span power circuitry with a simplex loop (see Figure 3
as needed).
4.1.3 Span Current Pin Jacks (Office Repeater Mode)
When configured to operate as an office repeater, the output
power (i.e., generated span current) can be measured at the
front-panel DROP −I and +I pin jacks. The LINE −I and +I
pin jacks can be used to measure span current from the Net-
work. See Figure 8 and Figure 16 for reference.
Span current is represented by the voltage measured across a
10-ohm resistor. A reading of 0.6Vdc equates to a measurement
of 60mA. For a reading of 57mA to 63mA, the voltage measured
across the −I and +I pin jacks will indicate 0.57Vdc to 0.63Vdc,
respectively.
4.1.4 CPE LOS Condition (Office Repeater Mode)
When configured to operate as an office repeater, a loss-of-sig-
nal condition from the CPE side (Side 2, Transmit to Network)
causes the unit to generate an Alarm Indication Signal (AIS)
pattern toward the Network. Signal transmission on Side 1 (Re-
ceive From Network) remains unaffected. Upon detecting a
signal from the CPE side, the unit restores normal operation.
4.1.5 CPE REGEN Option
To enable Customer-side regeneration (CPE REGEN):
CPE While the CPE REGEN LED is flashing, to enable
REGEN customer-side signal regeneration, press the MLB
button once. The CPE REGEN LED illuminates and
the unit sequences to the next LED − LPBK T.O.
If CPE regeneration is not required, simply let the
4-second timer time out. The CPE REGEN LED will
be off and the unit will sequence to the next LED −
LPBK T.O.
- NOTE -
With the CPE REGEN feature enabled, the signal regenerator recov-
ers signals from the CPE and regenerates the DS1 signal towards the
Network at a 0dB level.
4.1.6 Loopback Timeout Option
See Paragraph 5.1.2 for loopback timeout enable/disable details.
4.2 Line Repeater Operation
If the unit is to be configured to operate as a line repeater (i.e.,
option switches S1 and S2 are set to the appropriate positions
for the desired powering mode, see Table 2). While in the local
provisioning mode, the PWR/RPTR Provisioning LED
flashes. (See Figure 9 also).
PWR/ If the unit is to be configured to operate as a line/exten-
RPTR sion repeater, press the MLB button once within the
4-second time frame. The PWR/RPTR LED illumi-
nates and the unit sequences to the next Provisioning
LED option − LPBK T.O. (See the Note below).
If the Line/Extension Repeater mode is not desired,
let the 4−second timer time out (i.e., do not press the
MLB button). The PWR/RPTR LED will be off and
the unit will automatically be configured to operate as
an NIU. The unit will then sequence to the next Provi-
sioning LED option − CLOS ID. (See the Note
below).
- NOTE -
When configured to operate as a Line or an Extension Repeater, the
NET REGEN and CPE REGEN options are always enabled and the
NET REGEN and CPE REGEN LEDs will be lit steady. Also, while
set for the Line Repeater mode, the CLOS ID and ESF Only options
will be bypassed and those LEDs will be off. Even though the CLOS
ID LED is off, the unit, upon detecting a loss of signal from the CPE,
will send an Alarm Indication Signal (AIS) toward the network.
4.2.1 Signal Regeneration − Line Repeater Mode
When configured as a line repeater, the Side 1 and Side 2 trans-
mission paths automatically provide signal regeneration. The
regenerators recover the DS1 signals from both transmission
paths, respectively, and regenerate the DS1 signal for transmis-
sion at a 0dB level.
4.2.2 Powering − Line Repeater Mode
4.2.2.1 LOCAL Powering
When the unit is optioned for Local Power, the unit can be pow-
ered from a local external power source of −48Vdc, +24Vdc
or 24Vac as indicated in Table 4 below.