Adtran PSD 239 H2R Leaflet

ENHANCED PSD 239 H2R

239 H2R

CLEI: T1R6VJWD_ _

ARM (in-band)

11000 (binary)

H2TU-C and H2R will arm and the H2TU-R will loop-up toward the network

ARM (ESF Data Link)

FF48 (hex) or 1111 1111 
0100 1000 (binary) sent

H2TU-C and H2R will arm and the H2TU-R will loop-up toward the network

in the Facility Data Link

H2TU-R will only loop if the NIU option is enabled

Disarm (in-band)

11100 (binary)

All units are removed from the armed state and loopbacks will be released

Disarm (ESF Data Link)

FF24 (hex) or 1111 1111 
0010 0100 (binary) sent in  All units are removed from the armed state and loopbacks will be released
the Facility Data Link

H2TU-C Network Loop-Up

1

D3D3 (hex) or 

If received while in an armed state, the H2TU-C will loop toward the network, 

1101 0011 1101 0011

transmit 2 seconds of AIS(all 1s) followed by 5 seconds of loop code (D3 hex) 

(binary)

and then 231 logic errors will be injected toward the network.  The logic errors 
will continue to be sent in 231 bit error bursts every 20 seconds as long as the 
pattern continues to be detected by the H2TU-C.  When the pattern is removed, 
the unit will remain in loopback.

Loopdown w/out 

9393 (hex) or 

Automatically releases without disarming any H2TU-C and H2R that may be in  

disarming

2

1001 0011 1001 0011 (binary) loopback toward the network.

Loopback Query

1

D5D5 (hex) or  

Allows one to query the devices at any given time to determine whether any 

1101 0101 1101 0101 (binary) units are in loopback.  If D5 hex is received while in a loopback state, the unit in 

question will transmit the logic error count toward the network using the same 
methodology as identified in each of the loop-up descriptions (231 BE = H2TU-C, 
10 BE = H2R1, 200 BE = H2R2 and 20 BE = H2TU-R).

Query Loop Parameters

DBDB 

If the units are armed, and the H2TU-C is in network loopback, errors are 

(1101 1011 1101 1011) 

injected into the DSX-1 signal upon detection of the query loop parameters 

pattern.  As long as a pattern continues to be sent, errors are injected again 
every 20 seconds.  The number of errors injected each time depends on the 
current status of signal quality and pulse attenuation parameters on each 
loop.  111 errors are injected if all HDSL receiver [points (H2TU-C LP1/LP2, 
H2R #1 NET LP1/LP2, H2R #1 CST LP1/LP2, H2R #2 NET LP1/LP2, H2R #2 CST 
LP1/LP2, and H2TU-R LP1/LP2) indicate pulse attenuation is 30 dB or lower and 
signal quality (margin) is 6 dB or higher.  11 errors at a time are injected if any
of the 12 receiver points indicate pulse attenuation is greater than 30 dB 
and/or signal quality (margin) is less than 6 dB.

Loopback Time-Out 

D5D6 (hex) or 

If received during the armed state and prior to loopback initiation, the loopback 

Override

1, 3

1101 0101 1101 0110 

timeout override feature will automatically disable loopback timeout, i.e., the 

(binary)

loopback will not timeout after the 120 minute default period.  As long as the 
units remain armed, the timeout will remain disabled.  When the units are 
disarmed, the loopback timeout will once again return to the default value.

Span Power Disable

1, 3

6767 (hex) or 

If received during an armed state (must not be in loopback), the H2TU-C will remove

0110 0111 0110 0111 (binary) span power toward the line.  As long as the pattern is received, the span power will

remain disabled.  Once the pattern is no longer received, the H2TU-C will reactivate 
span power.  All units will then re-train and return to the disarmed state.

H2R1 Network Loop-up

1

C741 

If an H2R is present and units armed, the H2R will loop up toward network, 2 

(1100 0111 0100 0001)

seconds of AIS (all 1s) will be sent, 5 seconds of data will pass, and then 10 bit 
errors will be injected into the DSX-1 signal.  As long as the pattern continues to 
be sent, 10 errors will be injected every 20 seconds.  When the pattern is 
removed, the unit will remain in loopback.  If the pattern is reinstated, the
injection of 10 bit errors will resume at 20-second intervals.

H2TU-R Loop-up

1

C742 

ESF facility Datalink: ESF only; when sent from the network, an H2TU-R 

(1100 0111 0100 0010)

network loopback is activated and a 20-bit error confirmation is sent.  When 

sent from the customer, an H2TU-R customer loopback is activated with a 
20-bit error confirmation.

■  For a complete Installation and Maintenance Practice faxback: (877) 457-5007, Document # 742.  Please have your fax number available.  ■

●

●

Off 

No synchronization with the H2TU-C

●

Solid Green

Synchronized with an SNR margin greater than the user defined SNR 
Margin Alarm Threshold

✷

Fast Blinking (Blinking 3 times per second) Attempting to synchronize with the 
Green

H2TU-C

✷

Slow Blinking (Blinking 1 time per second) Synchronized with an SNR margin greater
Green

than the user defined SNR Margin Alarm Threshold and the pulse 
attenuation is greater than the user defined Loop Attenuation Alarm 
Threshold

●

Solid Yellow

Synchronized with an SNR margin greater than 0 dB but less than the user
defined SNR Margin Alarm Threshold

✷

Slow Blinking Synchronized with an SNR margin greater than 0 dB but less than the user
Yellow (1/sec) defined SNR Margin Alarm  Threshold and the pulse attenuation is greater

than the user defined Loop Attenuation Alarm Threshold

●

Solid Red

Synchronized with an SNR margin of 0 dB

✷

Slow Blinking (Blinking 1 time per second) Synchronized with an SNR margin of 0 dB 
Red

and the pulse attenuation is greater than the user defined Loop 
Attenuation Alarm Threshold

●

●

Off 

No synchronization with the H2TU-R

●

Solid Green 

Synchronized with an SNR margin greater than the user defined SNR 
Margin Alarm Threshold

✷

Fast Blinking (Blinking 3 times per second) Attempting to synchronize with the
Green

H2TU-R

✷

Slow Blinking (Blinking 1 time per second) Synchronized with an SNR margin greater
Green

than the user defined SNR Margin Alarm Threshold and the pulse attenu
ation is greater than the user defined Loop Attenuation Alarm Threshold

●

Solid Yellow 

Synchronized with an SNR margin greater than 0 dB but less than the user
defined SNR Margin Alarm Threshold

✷

Slow Blinking Synchronized with an SNR margin greater than 0 dB but less than the user
Yellow (1/sec) defined SNR Margin Alarm  Threshold and the pulse attenuation is greater

than the user defined Loop Attenuation Alarm Threshold

●

Solid Red 

Synchronized with an SNR margin of 0 dB

✷

Slow Blinking (Blinking 1 time per second) Synchronized with an SNR margin of 0 dB 
Red

and the pulse attenuation is greater than the user defined Loop 
Attenuation Alarm Threshold

●

Green 

Indicates a loopback at the H2R toward the H2TU-R is active

●

Yellow 

Indicates a loopback at the H2R toward the H2TU-C is active

The Enhanced PSD 239 H2R , P/N 1221045L2,
must be used in conjunction with the Enhanced
PSD T200 H2TU-R, P/N 1222026L9.  This H2R
will not function with any other H2TU-Rs.  The
Enhanced PSD T200 H2TU-R will function with
all versions of the ADTRAN H2R, but the
enhanced spectral performance will only be
achieved using the Enhanced PSD 239 H2R.