363-206-295
Technical Specifications
10-10 Issue 1 December 1997
Notes:
Table 10-5. 21G/21G-U and 21D/21D-U OLIU Link Budgets (Note 1)
21G/21G-U
(Note 2)
Parameter
21G2-U
(Note 3) Tx High Tx Low
21D/21D-U/
22D-U
Minimum Wavelength (l
Tmin
) 1280 nm 1280 nm 1280 nm 1270/1260* nm
Maximum Wavelength (λ
Tmax
) 1335 nm 1335 nm 1335 nm 1380 nm
Spectral Width (δλ
rms
) 4.0 nm 4.0 nm 4.0 nm 170 nm ¶¶
Maximum Transmitter Power (P
Tmax
) 0.0 dBm -2.5 dBm -7.5 dBm -14.0 dBm
Minimum Transmitter Power (P
Tmin
) -5.0 dBm -5.0 dBm -11.4 dBm -18.8/-21.8* dBm
Maximum Received Power (P
Rmax
) 0.0 dBm -7.0 dBm -7.0 dBm -14.0 dBm
Minimum Received Power (P
Rmin
) -34.0 dBm -34.0 dBm -34.0 dBm -33.8/-31.8* dBm
Minimum System Gain (S-R)‡ 29.0 dB 29.0 dB 22.6 dB 15/10.0* dB
Optical Path Penalty (P
O
)§ 1.0 dB 1.0 dB 1.0 dB 1.6 dB
Connector Loss¶ 1.5 dB 1.5 dB 1.5 dB 1.5 dB
Unallocated Margin∗∗ 1.5 dB 1.5 dB 1.5 dB 2.0 dB
Minimum Loss Budget 0.0 dBm 4.5 dB†† 0.0 dB 0.0 dB
Maximum Loss Budget‡‡ 25.0 dB 25.0 dB 18.6 dB 9.9/4.9* dB
Maximum Span Length§§ 55 km 55 km 41 km (Note 4)
1. All terminology is consistent with TR-253, Iss. 2. All specifications for 21G/21G-U/21G2-U OLIU
meets or exceeds long reach (LR) values described in TR-253, Iss. 2.
2. The High/Low transmitted power switch on the 21G/21G-U OLIU circuit pack allows for loopbacks or
small outside plant (OSP) budgets without external attenuators.
3. The 21G2-U does not have a High/Low transmitter power switch. When transmitting from a 21G2-U
to a 21G-U, 22F-U, 22D-U or 22G-U OLIU an external attenuator may be required. An attenuator is
not required when transmitting to 22F2-U or 22G2-U OLIUs.
4. Multimode only (see Table 10-6).
∗ When two numbers are given, the number before the slash is the specification for operating under
controlled environmental conditions. The number following the slash is the specification for
uncontrolled environmental conditions. If only one number is given, it applies to both controlled and
uncontrolled environmental conditions.
† Transmit and receive powers are referenced to points S and R as shown in Figure 10-1.
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